Difference between revisions of "Summarize iReport Template Data"

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{{TOC right}}
 
{{TOC right}}
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{{HowTo's
 
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|[[Start and Configure i-Report|Start and Configure i-Report]]
 
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|[[Create a Basic i-Report Template|Create a Basic i-Report Template]]
 
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|[[Modify an iReport Template|Modify an iReport Template]]
 
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|[[Format an iReport Template|Format an iReport Template]]
 
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|[[Create i-Report Templates with Subreports|Create i-Report Templates with Subreports]]
 
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|[[Summarize i-Report Template Data|Summarize i-Report Template Data]]
 
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}}
 
  
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==Summarizing Report Data==__NOEDITSECTION__
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==Summarising Report Data==__NOEDITSECTION__
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In addition to displaying report details in an iReport template, the iReport Designer allows you create summaries or calculations of data returned in the report. These can take the form of totals, sums, and counts (stored in Variables), or more complicated data summaries such as Crosstabs or Charts. Because summarizing data necessarily depends on multiple records, data summaries must exist in bands ''after'' the Detail band such as the Summary band, Footer bad, or Group Footer bands.
+
In addition to displaying report details in an iReport template, the iReport Designer allows creating summaries or calculations of data returned in the report. These can take the form of totals, sums, and counts (stored in variables), or more complicated data summaries such as crosstabs or charts. Because summarizing data necessarily depends on multiple records, data summaries must exist in bands ''after'' the Detail band such as the Summary band, Footer band, or Group Footer bands.
  
 
===Adding a Footer or Summary Section to the Report===__NOEDITSECTION__
 
===Adding a Footer or Summary Section to the Report===__NOEDITSECTION__
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</ol>
 
</ol>
 
   
 
   
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[[Image:iRep22.png|center|500px|''Figure 22. REPORT_COUNT element in summary section'']]
+
[[Image:iRep22.png|center|500px|''REPORT_COUNT element in summary section'']]
 
<div align="center">
 
<div align="center">
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''Figure 22. REPORT_COUNT element in summary section''
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''REPORT_COUNT element in summary section''
 
</div>
 
</div>
  
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</ol>
 
</ol>
  
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{{note|It may be helpful to add a text label beside any counts that you add to report to identify the value. To add a text label, drag the text field element [[Image:iRepText.png]] from the '''Palette''' pane. }}
+
{{note|It may be helpful to add a text label beside any counts that you add to the report to identify the value. To add a text label, drag the static text element [[Image:iRepText.png]] from the '''Palette''' pane. }}
  
 
===Displaying Totals===__NOEDITSECTION__
 
===Displaying Totals===__NOEDITSECTION__
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To create a custom variable:
 
To create a custom variable:
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# Follow the steps to [[Modify an iReport Template#Adding a Variable to an iReport Template| add a variable to an iReport]]
+
# Follow the steps to [[Modify an iReport Template#Adding a Variable to an iReport Template| add a variable to an iReport]].
 
# From the '''Calculation Type''' list in the '''Properties''' pane, select the calculation that you would like to perform.
 
# From the '''Calculation Type''' list in the '''Properties''' pane, select the calculation that you would like to perform.
  
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|-
 
|-
 
| System || No calculation is made. Instead the last value is stored.
 
| System || No calculation is made. Instead the last value is stored.
 +
|-
 +
| First || No calculation is made. Instead the first value is stored.
 
|}
 
|}
 
</center>
 
</center>
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{| class="wikitable" width="600"
 
{| class="wikitable" width="600"
 
|-
 
|-
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| align="center" colspan="2" | '''Table 5. Reset Types'''
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| align="center" colspan="2" | '''Reset Types'''
 
|-
 
|-
 
| width="150pt" | '''Reset Type'''
 
| width="150pt" | '''Reset Type'''
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|}
 
|}
  
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==Crosstabs==
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==Crosstabs==__NOEDITSECTION__
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In addition to summary variables, iReport provides the capability to build crosstab tables that display data in a grid for easy analysis and summary. Crosstabs allow you to choose data rows, columns, and the variable to measured and then automatically produce a grid of results for display in a chart. As with other summary variables Crosstabs are generally used in the '''Summary Band''' in a report.  
+
In addition to summary variables, iReport provides the capability to build crosstab tables that display data in a grid for easy analysis and summary. Crosstabs allow you to choose data rows, columns, and the variable to be measured and then automatically produce a grid of results for display in a chart. As with other summary variables Crosstabs are generally used in the '''Summary Band''' in a report.  
  
 
To create a Crosstab:
 
To create a Crosstab:
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# Select the '''Field''' or '''Variable''' to use to represent the data in the grid. Typically this is a numeric field (e.g. areaSize) or if a count of the records is desired, the ''REPORT_COUNT'' variable.
 
# Select the '''Field''' or '''Variable''' to use to represent the data in the grid. Typically this is a numeric field (e.g. areaSize) or if a count of the records is desired, the ''REPORT_COUNT'' variable.
 
#: [[Image:IReport Crosstab4.png|center|500px|''Crosstab wizard'']]<div align="center">''Crosstab wizard''</div>
 
#: [[Image:IReport Crosstab4.png|center|500px|''Crosstab wizard'']]<div align="center">''Crosstab wizard''</div>
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# Finalize the Crosstab display.
+
# Finalise the Crosstab display.
 
#: [[Image:IReport Crosstab5.png|center|500px|''Crosstab wizard'']]<div align="center">''Crosstab wizard''</div>
 
#: [[Image:IReport Crosstab5.png|center|500px|''Crosstab wizard'']]<div align="center">''Crosstab wizard''</div>
 
# The Crosstab displays.
 
# The Crosstab displays.
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[[Image:IReport Crosstab7.png|center|500px|''Crosstab Preview'']]<div align="center">''Example Crosstab Preview''</div>
 
[[Image:IReport Crosstab7.png|center|500px|''Crosstab Preview'']]<div align="center">''Example Crosstab Preview''</div>
  
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==Charts==
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==Charts==__NOEDITSECTION__
  
 
Charts provide a visual representation of the report data. Before you add a chart to your report, you should ensure that your report contains the following:
 
Charts provide a visual representation of the report data. Before you add a chart to your report, you should ensure that your report contains the following:
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===Pie Chart===__NOEDITSECTION__
 
===Pie Chart===__NOEDITSECTION__
  
 +
====Add a Pie Chart====__NOEDITSECTION__
 
To add a pie chart to the report:
 
To add a pie chart to the report:
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#Create a report which groups the results by the attribute on which you would like to base your chart (e.g. ''status'')
+
#Create a report which groups the results by the attribute on which you would like to base your chart (e.g. ''status'').
 
#Ensure that the Summary Band is available on the iReport template canvas.
 
#Ensure that the Summary Band is available on the iReport template canvas.
 
#[[Modify_an_iReport_Template#Adding a Variable to an iReport Template|Create a Variable]] to contain the values to be displayed in the chart (e.g. ''SUM_areaSize_byStatus''). This variable should be based on a numeric field (e.g. ''areaSize'') and should have the '''Reset type''' set to '''Group''' and the group selected set to the field you wish to create the chart from'' (e.g. ''status'').
 
#[[Modify_an_iReport_Template#Adding a Variable to an iReport Template|Create a Variable]] to contain the values to be displayed in the chart (e.g. ''SUM_areaSize_byStatus''). This variable should be based on a numeric field (e.g. ''areaSize'') and should have the '''Reset type''' set to '''Group''' and the group selected set to the field you wish to create the chart from'' (e.g. ''status'').
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# The next step is to provide the correct data for the chart to use. Pie Charts require a '''unique identifier''' and a '''numeric''' value where the unique identifier is the field to group the data by (i.e. the names of the wedges) and numeric value is the value to sum.  
 
# The next step is to provide the correct data for the chart to use. Pie Charts require a '''unique identifier''' and a '''numeric''' value where the unique identifier is the field to group the data by (i.e. the names of the wedges) and numeric value is the value to sum.  
 
#:[[Image:iReport Charts3.png|center|500px|''Chart options'']]<div align="center">''Chart options''</div>
 
#:[[Image:iReport Charts3.png|center|500px|''Chart options'']]<div align="center">''Chart options''</div>
−
# To select the '''unique value''' choose the '''Expression editor''' button and '''choose the ''field'' the report is grouped by''' (e.g. ''status''). Note that charts in iReport will fail if the '''unique value''' is null. In order to account for null values, you will need to modify the expression so that null values are grouped into their own group. The expression should be modified to include the bolded text below. You should replace attribute with the name of the attribute that you selected in step b above.
+
# To select the '''unique value''' choose the '''Expression editor''' button and '''choose the ''field'' the report is grouped by''' (e.g. ''status''). Note that charts in iReport will fail if the '''unique value''' is null. In order to account for null values, you will need to modify the expression so that null values are grouped into their own group. The expression should be modified to include the bolded text below.
 
#: '''$F{status} == null ? "N/A" : $F{status}'''
 
#: '''$F{status} == null ? "N/A" : $F{status}'''
 
#:[[Image:iReport Charts5.png|center|500px|''Set Unique Value'']]<div align="center">''Set Unique Value''</div>
 
#:[[Image:iReport Charts5.png|center|500px|''Set Unique Value'']]<div align="center">''Set Unique Value''</div>
−
#Next, select the '''numeric value''' that contains the desired numeric data for the chart. '''Note: This should always be the variable created in step 3 above''' (e.g. ''SUM_status_byAreaSize'').  
+
#Next, select the '''numeric value''' that contains the desired numeric data for the chart. '''Note: This should always be the variable created in step 3 above''' (e.g. ''SUM_areaSize_byStatus'').  
 
#:[[Image:iReport Charts6.png|center|500px|''Select the desired numeric variable'']]<div align="center">''Select the desired numeric variable''</div>
 
#:[[Image:iReport Charts6.png|center|500px|''Select the desired numeric variable'']]<div align="center">''Select the desired numeric variable''</div>
 
#Choose '''Next'''.
 
#Choose '''Next'''.
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#:[[Image:iReport Charts7.png|center|500px|''Select the desired numeric variable'']]<div align="center">''Select the desired numeric variable''</div>
+
#:[[Image:iReport Charts7.png|center|500px|''Chart Wizard Completed'']]<div align="center">''Chart Wizard Completed''</div>
−
# Choose '''Finish'''.
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# Choose '''Finish''' and the iReport template displays with the Chart.
−
#:[[Image:iReport Charts8.png|center|500px|''Select the desired numeric variable'']]<div align="center">''Select the desired numeric variable''</div>
+
#:[[Image:iReport Charts8.png|center|500px|''iReport displays with Chart'']]<div align="center">''iReport displays with Chart''</div>
−
 
+
# The report can now be previewed to ensure it is functioning as expected.
−
 
+
#:[[Image:iReport ChartsPreview.png|center|500px|''Preview with Chart'']]<div align="center">''Preview with chart''</div>
−
<li>The following figure is an example of the Chart Properties window for a report that contains a pie chart which graphs the total area size of land based on their priority.</li>
+
====Modify a Pie Chart====__NOEDITSECTION__
−
 
+
Once a chart has been created in iReport Designer, its properties can be edited by selecting the '''Chart Data''' option on the right click menu and adjusting the values and properties.
−
</ol>
 
−
 
 
−
[[Image:iRep27.png|center|500px|''Figure 27. Chart Properties'']]
 
−
<div align="center">
 
−
''Figure 27. Chart Properties''
 
−
</div>
 
  
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<ol start="17">
+
To modify a chart:
−
<li>Click the '''Close''' button</li>
+
# Right click on the chart in iReport Designer and select '''Chart Data''' from the menu.
−
:The Chart Properties window closes.
+
# The Chart details window displays.
−
<li>Save the report by either clicking the   icon, or by selecting the '''Save''' option from the '''File''' menu.</li>
+
#: [[Image:IReport ChartData1.png|center|500px|''Chart Data Properties'']]<div align="center">''Chart Data Properties''</div>
−
</ol>
+
# To edit the main properties of the chart, select the '''Details tab'''. Additionally, this screen can be used to edit the reset type of the chart which is relevant if the chart is displayed on a band other than the summary band.
 +
# The '''Chart Details''' window displays.
 +
#: [[Image:IReport ChartData2.png|center|500px|''Chart Data Properties'']]<div align="center">''Chart Data Properties''</div>
 +
# In this window, the basic properties of the chart that were established in the Chart Wizard can be edited. These include:
 +
#* '''Key Expression''': the field used to group data for charting purposes. To change the field, simply select another field. '''Note:''' The field must be used in the creation of the variable used in the value expression or the results will be incorrect.
 +
#* '''Value Expression''': the variable used to store the data to be displayed in the chart. If changes are made this value it is recommended to edit the variable properties as well.
 +
#* '''Label Expression''': the area used to define the labels for the chart. Any valid expression can be used here. See [[Summarize iReport Template Data#Variable Expressions|Variable Expressions]] for more details.
  
−
Below is an example of a report template that totals the area size of land by priority.
 
−
 
−
[[Image:iRep28.png|center|500px|''Figure 28. Sample report template with pie chart'']]
 
−
<div align="center">
 
−
''Figure 28. Sample report template with pie chart''
 
−
</div>
 
−
 
−
The resulting report pages are shown below.
 
−
[[Image:iRep29.png|center|500px|''Figure 29. Sample report with pie chart'']]
 
−
<div align="center">
 
−
''Figure 29. Sample report with pie chart''
 
−
</div>
 
  
 
===Bar Charts===__NOEDITSECTION__
 
===Bar Charts===__NOEDITSECTION__
 +
Bar charts, unlike Pie Charts, have a third variable option that can be included in the report. In addition to the category and value expressions, bar charts add the option of a '''''series'''''. The series choice adds an additional possibility of grouping data though is not required.
  
−
{{note|The sample report ''Bar Chart Sample.jrxm l''in the <iReport Installation Directory>\iReports_IMSMA\IMSMA reports directory provides an example of a report that includes a bar chart.}}
+
====Add a Bar Chart====__NOEDITSECTION__
−
 
 
 
To add a bar chart to the report:
 
To add a bar chart to the report:
−
<ol>
+
#Create a report which groups the results by the attribute on which you would like to base your chart (e.g. ''status'')
−
<li>Create a report which groups the results by the attribute on which you would like to base your chart.</li>
+
#Ensure that the Summary Band is available on the iReport template canvas.
−
<li>After creating the report, you should add a footer for the attribute on which the results will be grouped. This footer will be used to display the total for the group that will subsequently be used in the pie chart. To add a group footer:</li>
+
#[[Modify_an_iReport_Template#Adding a Variable to an iReport Template|Create a Variable]] to contain the values to be displayed in the chart (e.g. ''SUM_areaSize_byStatus''). This variable should be based on a numeric field (e.g. ''areaSize'') and should have the '''Reset type''' set to '''Group''' and the group selected set to the field you wish to create the chart from'' (e.g. ''status'').
−
<ol type="a">
+
#Select the '''Chart''' option from the '''Palette''' pane and drag it to the '''Summary Band''' of the report template to start the '''Chart Wizard'''.
−
<li>From the '''View''' menu, select '''Bands'''.</li>
+
#Select one of the bar chart options.
−
:The <FileName> bands… window displays.  
+
#:[[Image:IReport BarChart.png|center|500px|''Chart options'']]<div align="center">''Chart options''</div>
−
<li>Select <'''GroupAttribute'''>Footer from the left pane where ''GroupAttribute'' is the name of the attribute on which the results will be grouped. For example, if you are creating a report on land and group the results by the priority, the name of the band would be ''priorityFooter''.</li>
+
#Choose Main report dataset.
−
<li>In the right pane, enter a numeric value in the Band Height field. You may adjust the height of the summary</li>
+
#:[[Image:IReport BarChart_Step1.png|center|500px|''Chart options'']]<div align="center">''Chart options''</div>
−
<li>Click the '''Apply''' button.</li>
+
# Provide a '''Series Expression''' (''optional'').
−
</ol>
+
#:[[Image:iReport Chart Bar1.png|center|500px|''Series Expression'']]<div align="center">''Series Expression''</div>
−
<li>Add a summary section to the report.</li>
+
# The Series Expression allows you to define an added level of detail to your bar chart (if desired). To select the '''Series''' choose the '''Expression editor''' button and '''choose one of the ''fields'' the report is grouped by''' (e.g. ''status''). Note that charts in iReport will fail if the '''Series''' value is null. In order to account for null values, you will need to modify the expression so that null values are grouped into their own group. The expression should be modified to include the bolded text below. You should replace the field the name of the field that you selected above.
−
<li>Click the [[Image:iRepBarChart.png]] icon.</li>
+
#: '''$F{status} == null ? "N/A" : $F{status}'''
−
<li>In the summary section of the report, hold down the mouse button and drag the cursor to form the rectangle which will contain the chart.</li>
+
#:[[Image:iReport Charts5.png|center|500px|''Set Series Value'']]<div align="center">''Set Series Value''</div>
−
:A window of the various chart options displays.
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#: The expression that you enter in the Series Expression field will vary based on how you want the horizontal axis to appear:
−
<li>Select one of the bar chart options.</li>
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#*If you would like the horizontal axis of the bar chart to reflect a single attribute such as the chart displayed below, the Series Expression will be the same as the Category expression.
−
<li>Click the '''OK''' button.</li>
+
#:[[Image:iRep30.png|center|500px|''Bar chart –Single attribute y-axis'']]<div align="center">''Bar chart –Single attribute y-axis''</div>
−
<li>Right-click anywhere on the chart.</li>
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#*If you would like the horizontal axis of the bar chart to reflect the values of an additional attribute, the Series Expression would be the expression for the secondary level of detail. In the example shown below, the x-axis reflects the land priorities (e.g., Low, Medium, or High). In addition to displaying the priority, the bars of the chart use a different colour to reflect those land which block water access (red) vs. those that do not block the water (blue).  
−
<li>Select the '''Chart Properties''' option.</li>
+
#:[[Image:iRep31.png|center|500px|''Bar chart with different series expression'']]<div align="center">''Bar chart with different series Expression''</div>
−
<li>From the Chart Properties window, select the Chart Data tab.</li>
+
#* '''Finally, the Series value can be left blank if desired.'''
−
<li>From the Chart Data tab, select the Details tab.</li>
+
# The next step is to provide the correct data for the chart to use. Bar charts require a '''category expression''' and a '''value expression''' where the value expression is a field to group the data by (i.e. the names of the X axis) and value expression is the value to sum.
−
<li>Click the '''Add''' button.</li>
+
#:[[Image:iReport Chart Bar2.png|center|500px|''Category and Values'']]<div align="center">''Category and Values''</div>
−
:The Chart Properties window displays. By default, the Data tab should be selected.
+
# To select the '''category expression''' choose the '''Expression editor''' button and '''choose one of the ''fields'' the report is grouped by''' (e.g. ''status''). Note that charts in iReport will fail if the '''category expression''' is null. In order to account for null values, you will need to modify the expression so that null values are grouped into their own group. The expression should be modified to include the bolded text below. You should replace field with the field that you selected above.
−
<li>The Series Expression allows you to define an added level of detail to your bar chart. To enter the series expression value:</li>
+
#: '''$F{status} == null ? "N/A" : $F{status}'''
−
<ol type="a">
+
#:[[Image:iReport Charts5.png|center|500px|''Set Category Expression'']]<div align="center">''Set Category Expression''</div>
−
<li>Click the [[Image:iRepEditor.png]] icon that is displayed beside the Key Expression field.</li>
+
#Next, select the '''value expression''' that contains the desired numeric data for the chart. '''Note: This should always be one of the variables created in step 3 above''' (e.g. ''SUM_status_byAreaSize'').
−
:The Expression editor window displays.
+
#:[[Image:iReport Charts6.png|center|500px|''Select the desired value expression'']]<div align="center">''Select the desired value expression''</div>
−
<li>From the bottom pane, double-click the name of the attribute that contains the data that you would like to include in the chart.</li>
+
# Choose '''Finish''' and the iReport template displays with the Chart.
−
:The expression to represent the attribute displays in the top pane.
+
#:[[Image:iReport Chart Bar3.png|center|500px|''iReport displays with Chart'']]<div align="center">''iReport displays with Chart''</div>
−
<li>In order to account for null values, you will need to modify the expression so that null values are grouped into their own group. The expression should be modified to include the bolded text below. You should replace attribute with the name of the attribute that you selected in step b above.</li>
+
# The report can now be previewed to ensure it is functioning as expected.
−
$F{''attribute''} '''!= null ? $F{attribute} : "Unknown"'''
+
#:[[Image:iReport Chart BarPreview.png|center|500px|''Preview with Chart'']]<div align="center">''Preview with chart''</div>
−
<li>Click the '''Apply''' button.</li>
 
−
</ol>
 
−
The expression that you enter in the Series Expression field will vary based on how you want the horizontal axis to appear:
 
−
*If you would like the horizontal axis of the bar chart to reflect a single attribute such as the chart displayed below, the Series Expression will be the same as the Category expression.
 
−
</ol>
 
−
 
 
−
[[Image:iRep30.png|center|500px|''Figure 30. Bar chart –Single attribute y-axis'']]
 
−
<div align="center">
 
−
''Figure 30. Bar chart –Single attribute y-axis''
 
−
</div>
 
−
 
 
−
<ol>
 
−
*If you would like the horizontal axis of the bar chart to reflect the values of an additional attribute, the Series Expression would be the expression for the secondary level of detail. In the example shown below, the x-axis reflects the land priorities (e.g., Low, Medium, or High). In addition to displaying the priority, the bars of the chart use a different colour to reflect those land which block water access (red) vs. those that do not block the water (blue).  
 
−
</ol>
 
  
−
[[Image:iRep31.png|center|500px|''Figure 31. Bar chart with different series expression'']]
+
====Modify a Bar Chart====__NOEDITSECTION__
−
<div align="center">
+
Once a bar chart has been created in iReport Designer, its properties can be edited by selecting the '''Chart Data''' option on the right click menu and adjusting the values and properties.
−
''Figure 31. Bar chart with different series expression''
 
−
</div>
 
  
−
<ol>
+
To modify a bar chart:
−
The Chart Properties window for this bar chart is shown below. Notice that the series expression and category expression differ.
+
# Right click on the chart in iReport Designer and select '''Chart Data''' from the menu.
−
</ol>
+
# The Chart Data properties display.
−
 
+
# To edit the main properties of the chart, select the '''Details tab'''. Additionally, this screen can be used to edit the reset type of the chart which is relevant if the chart is displayed on a band other than the summary band.
−
[[Image:iRep32.png|center|500px|''Figure 32. Chart Properties – Different series and category expressions'']]
+
# The '''Chart Details''' window displays
−
<div align="center">
+
#: [[Image:IReport Chart Bar ChartData1.png|center|500px|''Chart Data Properties'']]<div align="center">''Chart Data Properties''</div>
−
''Figure 32. Chart Properties – Different series and category expressions''
+
# For Bar Charts this presents the '''Category Series''' chooser. Typically there will be only one or two series to choose from here though more can be added at this point. Select the series to modify and choose '''Modify'''.
−
</div>
+
# The Chart Data properties window will display
−
 
+
#: [[Image:IReport Chart Bar ChartData2.png|center|500px|''Chart Data Properties'']]<div align="center">''Chart Data Properties''</div>
−
<ol>
+
# In this window, the basic properties of the bar chart that were established in the Chart Wizard can be edited. These include:
−
*If you selected one of the stacked bar chart options, the series expression will be used to determine the segments of each bar. In the following figure, the series expression creates red and blue segments in each bar to indicate whether or not water access is blocked.
+
#*'''Series Expression''': the field used to first group data for charting purposes. To change the field, simply select another field. '''Note:''' while this field is required it can be made blank or fixed by being set to a constant such as: "" or "Blank".
−
</ol>
+
#*'''Category Expression''': the field used to group data for charting purposes. To change the field, simply select another field. '''Note:''' The field must be used in the creation of the variable used in the value expression or the results will be incorrect.
−
 
+
#* '''Value Expression''': the variable used to store the data to be displayed in the chart. If changes are made this value it is recommended to edit the variable properties as well.
−
[[Image:iRep33.png|center|500px|''Figure 33. Stacked bar chart'']]
+
#* '''Label Expression''': the area used to define the labels for the chart. Any valid expression can be used here. See [[Summarize iReport Template Data#Variable Expressions|Variable Expressions]] for more details.
−
<div align="center">
 
−
''Figure 33. Stacked bar chart''
 
−
</div>
 
−
 
 
−
<ol start="14">
 
−
<li>The Category Expression is the major grouping of the horizontal axis. To enter the category expression:</li>
 
−
<ol type="a">
 
−
<li>Click the [[Image:iRepEditor.png]] icon that is displayed beside the Category expression field.</li>
 
−
:The Expression editor window displays.
 
−
<li>From the bottom pane, double-click the name of the attribute that contains the data that you would like to include in the chart.</li>
 
−
:The expression to represent the attribute displays in the top pane.
 
−
<li>In order to account for null values, you will need to modify the expression so that null values are grouped into their own group. The expression should be modified to include the bolded text below. You should replace attribute with the name of the attribute that you selected in step b above.</li>
 
−
$F{''attribute''} '''!= null ? $F{attribute} : "Unknown"'''
 
−
<li>Click the '''Apply''' button.</li>
 
−
</ol>
 
−
<li>The '''Value Expression''' field contains the expression that returns the numeric value for the key.</li>
 
−
<ol type="a">
 
−
<li>Click the [[Image:iRepEditor.png]] icon that is displayed beside the Value Expression field.</li>
 
−
:The Expression editor window displays.
 
−
<li>From the Objects and expressions tab, select '''Variables''' from the left pane.</li>
 
−
<li>From the middle pane at the bottom of the Expression editor window, double-click the name of the variable that was created to store the total.</li>
 
−
<li>Click the '''Apply''' button.</li>
 
−
</ol>
 
−
<li>Click the '''OK''' button.</li>
 
−
:The Chart Properties window closes.
 
−
<li>Click the '''Close''' button.</li>
 
−
:The Chart Properties window closes.
 
−
<li>Save the report by either clicking the [[Image:iRepSave.png]] icon, or by selecting the '''Save''' option from the '''File''' menu.</li>
 
−
</ol>
 
−
 
 
−
===Grouped Bar Chart===__NOEDITSECTION__
 
−
The horizontal axis of the bar charts discussed in the previous section compared the values of a single variable. For example, the bar chart below compares the number of different activity types.  
 
−
 
 
−
[[Image:iRep34.png|center|500px|''Figure 34. Bar chart comparing values of a single variable'']]
 
−
<div align="center">
 
−
''Figure 34. Bar chart comparing values of a single variable''
 
−
</div>
 
−
 
 
−
In this section, you will learn how to create a grouped bar chart. A grouped bar chart compares the values of a single variable in one group to the same variables in another group. In the example below, the grouped bar chart still compares the number of activity types. However, the chart also compares the number of activity types between the districts. The number of activity types (clearance, impact survey, technical survey, and road clearance) are represented by the different bar colours as indicated in the legend. The coloured bars are clustered together based on their district. The first cluster of bars shows the number of activity in the Bolikon district. The second cluster of bars shows the number of activities in the Waltern district.
 
−
 
 
−
[[Image:iRep35.png|center|500px|''Figure 35. Grouped bar chart comparing values of a single variable'']]
 
−
<div align="center">
 
−
''Figure 35. Grouped bar chart comparing values of a single variable''
 
−
</div>
 
−
 
 
−
The two main differences between adding a bar chart and a grouped bar chart are:
 
−
*The grouped bar chart requires that you specify at least two groupings for the report.  
 
−
*The key expression and the category expression will differ; whereas, for a bar chart, the value for these expressions is the same.
 
−
 
 
−
To add a grouped bar chart to the report:
 
−
<ol>
 
−
<li>Create a report which groups the results by the fields that will be represented on the horizontal axis of the chart.</li>
 
−
</ol>
 
−
 
 
−
{{note|For a grouped bar chart, you will need to specify at least two groupings.}}
 
−
 
 
−
<ol start="2">
 
−
<li>Add any variables that you may need to calculate the value that you would like to show on the chart.</li>
 
−
<li>If you would like to display the calculated variable for each group, you should add the footer for the field on which the results will be grouped. This footer will be used to display the variable for the group that will subsequently be used in the chart. To add a group footer:</li>
 
−
<ol type="a">
 
−
<li>From the '''View''' menu, select '''Bands'''.</li>
 
−
:The <FileName> bands… window displays.
 
−
<li>Select <''GroupFieldName''>Footer from the left pane where ''GroupFieldNameis'' the name of the field on which the results will be grouped. For example, if you are creating a report on land and group the results by the priority, the name of the band would be ''priorityFooter''.</li>
 
−
<li>In the right pane, enter a numeric value in the Band Height field. You may adjust the height of the summary.</li>
 
−
<li>Click the '''Apply''' button.</li>
 
−
<li>Add a summary section to the report.</li>
 
−
</ol>
 
−
<li>Click the [[Image:iRepBarChart.png]] icon.</li>
 
−
<li>In the summary section of the report, hold down the mouse button and drag the cursor to form the rectangle which will contain the chart.</li>
 
−
:A window of the various chart options displays.
 
−
<li>Select one of the bar chart options.</li>
 
−
</ol>
 
−
 
 
−
[[Image:iRep36.png|center|500px|''Figure 36. Bar chart options'']]
 
−
<div align="center">
 
−
''Figure 36. Bar chart options''
 
−
</div>
 
−
 
 
−
<ol start="8">
 
−
<li>Click the '''OK''' button.</li>
 
−
<li>Right-click anywhere on the chart.</li>
 
−
<li>select the '''Chart Properties''' option.</li>
 
−
<li>From the Chart Properties window, select the Chart Data tab.</li>
 
−
<li>From the Chart Data tab, select the Details tab.</li>
 
−
<li>Click the '''Add''' button.</li>
 
−
:The Chart Properties window displays. By default, the Data tab should be selected.  
 
−
<li>For a grouped bar chart, the series expression contains the field whose distinct values you would like to show via different colours on the bar chart.</li>
 
−
</ol>
 
−
 
 
−
[[Image:iRep37.png|center|500px|''Figure 37. Bar chart series expression'']]
 
−
<div align="center">
 
−
''Figure 37. Bar chart series expression''
 
−
</div>
 
−
 
 
−
To enter the series expression:
 
−
<ol start="15">
 
−
<ol type="a">
 
−
<li>Click the [[Image:iRepEditor.png]] icon that is displayed beside the Key Expression field.</li>
 
−
:The Expression editor window displays.
 
−
<li>From the bottom pane, double-click the name of the field that contains the data that you would like to include in the chart.</li>
 
−
:The expression to represent the field displays in the top pane.
 
−
<li>Click the '''Apply''' button.</li>
 
−
</ol>
 
−
<li>The Category Expression is the field by which the series expression is grouped together.</li>
 
−
</ol>
 
−
 
 
−
[[Image:iRep38.png|center|500px|''Figure 38. Bar chart category expression'']]
 
−
<div align="center">
 
−
''Figure 38. Bar chart category expression''
 
−
</div>
 
−
 
 
−
To enter the category expression:
 
−
<ol start="16">
 
−
<ol type="a">
 
−
<li>Click the [[Image:iRepEditor.png]] icon that is displayed beside the Category expression field.</li>
 
−
:The Expression editor window displays.
 
−
<li>From the bottom pane, double-click the name of the field that contains the data that you would like to include in the chart.</li>
 
−
:The expression to represent the field displays in the top pane.
 
−
<li>Click the '''Apply''' button.</li>
 
−
</ol>
 
−
<li>The '''Value Expression''' field contains the variable that returns the numeric value that will be represented on the chart.</li>
 
−
<ol type="a">
 
−
<li>Click the [[Image:iRepEditor.png]] icon that is displayed beside the Value Expression field.</li>
 
−
:The Expression editor window displays.
 
−
<li>From the Objects and expressions tab, select '''Variables''' from the left pane.</li>
 
−
<li>From the middle pane at the bottom of the Expression editor window, double-click the name of the variable that you would like to represent on the chart.</li>
 
−
<li>Click the '''Apply''' button.</li>
 
−
</ol>
 
−
<li>Click the '''OK''' button.</li>
 
−
:The Chart Properties window closes.
 
−
<li>Click the '''Close''' button.</li>
 
−
:The Chart Properties window closes.
 
−
<li>Save the report by either clicking the [[Image:iRepSave.png]] icon, or by selecting the Save option from the '''File''' menu.</li>
 
−
</ol>
 
−
 
 
−
{{note|iReport requires you to save the report after adding or changing a chart.}}
 
−
 
 
−
<ol start="20">
 
−
<li>Click the [[Image:iRepCompile.png]] button to compile the report.</li>
 
−
<li>Click the [[Image:iRepRun.png]] button to execute the report.</li>
 
−
</ol>
 
−
 
 
−
===Stacked Bar Chart===__NOEDITSECTION__
 
−
A stacked bar chart is similar to a grouped bar in that it allows you to represent two different fields on the chart. The key difference is that the stacked bar chart layers the values of the series expression (the field represented in the legend) allowing you to easily compare the categories to one another.
 
−
 
 
−
[[Image:iRep39.png|center|500px|''Figure 39. Stacked bar chart'']]
 
−
<div align="center">
 
−
''Figure 39. Stacked bar chart''
 
−
</div>
 
−
 
 
−
To add a grouped bar chart to the report:
 
−
<ol>
 
−
<li>Create a report which groups the results by the fields that will be represented on the horizontal axis of the chart.</li>
 
−
</ol>
 
−
 
 
−
{{note|For a stacked bar chart, you will need to specify at least two groupings.}}
 
−
 
 
−
<ol start="2">
 
−
<li>Add any variables that you may need to calculate the value that you would like to show on the chart.</li>
 
−
<li>If you would like to display the calculated variable for each group, you should add the footer for the field on which the results will be grouped. This footer will be used to display the variable for the group that will subsequently be used in the chart. To add a group footer:</li>
 
−
<ol type="a">
 
−
<li>From the '''View''' menu, select '''Bands'''.</li>
 
−
:The <FileName> bands… window displays.
 
−
<li>Select <''GroupFieldName''>Footer from the left pane where ''GroupFieldName'' is the name of the field on which the results will be grouped. For example, if you are creating a report on land and group the results by the priority, the name of the band would be ''priorityFooter''.</li>
 
−
<li>In the right pane, enter a numeric value in the '''Band Height''' field. You may adjust the height of the summary</li>
 
−
<li>Click the '''Apply''' button.</li>
 
−
</ol>
 
−
<li>Add a summary section to the report.</li>
 
−
<li>Click the [[Image:iRepBarChart.png]] icon.</li>
 
−
<li>In the summary section of the report, hold down the mouse button and drag the cursor to form the rectangle which will contain the chart.</li>
 
−
:A window of the various chart options displays.
 
−
<li>Select one of the stacked bar chart options.</li>
 
−
</ol>
 
−
 
 
−
[[Image:iRep40.png|center|500px|''Figure 40. Stacked bar chart options'']]
 
−
<div align="center">
 
−
''Figure 40. Stacked bar chart options''
 
−
</div>
 
−
 
 
−
<ol start="8">
 
−
<li>Click the '''OK''' button.</li>
 
−
<li>Right-click anywhere on the chart.</li>
 
−
<li>Select the '''Chart Properties''' option.</li>
 
−
<li>From the Chart Properties window, select the Chart Data tab.</li>
 
−
<li>From the Chart Data tab, select the Details tab.</li.
 
−
<li>Click the '''Add''' button.</li>
 
−
:The Chart Properties window displays. By default, the Data tab should be selected.
 
−
<li>For a stacked bar chart, the series expression contains the fields whose distinct value.</li>
 
−
<li>For a grouped bar chart, the series expression contains the field whose distinct values you would like to show via different colours on the bar chart. To enter the series expression:</li>
 
−
<ol type="a">
 
−
<li>Click the [[Image:iRepEditor.png]] icon that is displayed beside the Key Expression field.
 
−
:The Expression editor window displays.</li>
 
−
<li>From the bottom pane, double-click the name of the field that contains the data that you would like to include in the chart.</li>
 
−
:The expression to represent the field displays in the top pane.
 
−
<li>Click the '''Apply''' button.</li>
 
−
</ol>
 
−
<li>The Category Expression is the field by which the series expression is grouped together. To enter the category expression:</li>
 
−
<ol type="a">
 
−
<li>Click the [[Image:iRepEditor.png]] icon that is displayed beside the Category expression field.</vli>
 
−
:The Expression editor window displays.
 
−
<li>From the bottom pane, double-click the name of the field that contains the data that you would like to include in the chart.</li>
 
−
The expression to represent the field displays in the top pane.
 
−
<li>Click the Apply button.</li>
 
−
</ol>
 
−
<li>The '''Value Expression''' field contains the variable that returns the numeric value that will be represented on the chart.</li>
 
−
<ol type="a">
 
−
<li>Click the [[Image:iRepEditor.png]] icon that is displayed beside the Value Expression field.</li>
 
−
:The Expression editor window displays.
 
−
<li>From the Objects and expressions tab, select '''Variables''' from the left pane.</li>
 
−
<li>From the middle pane at the bottom of the Expression editor window, double-click the name of the variable that you would like to represent on the chart.</li>
 
−
<li>Click the '''Apply''' button.</li>
 
−
</ol>
 
−
<li>Click the '''OK''' button.</li>
 
−
:The Chart Properties window closes.
 
−
<li>Click the '''Close''' button.</li>
 
−
:The Chart Properties window closes.
 
−
<li>Save the report by either clicking the [[Image:iRepSave.png]] icon, or by selecting the '''Save''' option from the '''File''' menu.</li>
 
−
<li>Click the [[Image:iRepCompile.png]] button to compile the report.</li>
 
−
<li>Click the [[Image:iRepRun.png]] button to execute the report.</li>
 
−
</ol>
 
  
−
{{NavBox HowTo use iReport}}
+
{{NavBox HowTo Standardizing Data Analysis and Information Reporting}}
 +
[[Category:NAA]]

Latest revision as of 20:24, 20 February 2020

Summarising Report Data

In addition to displaying report details in an iReport template, the iReport Designer allows creating summaries or calculations of data returned in the report. These can take the form of totals, sums, and counts (stored in variables), or more complicated data summaries such as crosstabs or charts. Because summarizing data necessarily depends on multiple records, data summaries must exist in bands after the Detail band such as the Summary band, Footer band, or Group Footer bands.

Adding a Footer or Summary Section to the Report

Totals, averages, and other summary data are typically found at the end of a grouping or at the end of a report. If a desired band is not visible on the iReport Designer canvas:

  1. Select the desired band in the Report Inspector
  2. In the Properties pane, change the Band Height property to something more than 0 (e.g. 50).

Displaying Counts

iReport has a built-in variable for calculating the number of records in a report and the number of records in each group if the report contains groups. The number of records in the report is stored in the REPORT_COUNT variable. The number of records in each group is stored in the <GroupField>_COUNT where GroupField is the name of the field on which the group is created.

To display one of the built-in count variables in the report:

  1. Expand the appropriate section to the report. If you would like to add the number of records in the report, you will need to expand the summary section of the report. If you would like to add the number of records for each group, you will need to expand the <GroupField>Footer section.
  2. From the Report Inspector, select Variables.
    3. The REPORT_COUNT variable will always be available in the Variables list. The variable to display the count for the group will only be displayed if the report contains groups.
  3. To display the number of records in your report, drag the REPORT_COUNT variable to the summary section of the report.
REPORT_COUNT element in summary section

REPORT_COUNT element in summary section

Note.jpg If the REPORT_COUNT element is dragged to a section of the report other than the summary, the value returned by the REPORT_COUNT variable will be determined by where it is placed. For example, if the REPORT_COUNT is placed in the pageFooter section, the value returned will be the number of records displayed so far.
  1. To display the number of records in each group, drag the <GroupName>_COUNT variable to the <GroupName>Footer section.
Note.jpg It may be helpful to add a text label beside any counts that you add to the report to identify the value. To add a text label, drag the static text element IRepText.png from the Palette pane.

Displaying Totals

iReport allows you to display the total of a particular attribute in the report. This is done by creating a variable to store the total value (see Adding a Variable to an iReport).

To display a total:

  1. Ensure that a group footer or summary section has been added to the report.
  2. From the Report Inspector pane, choose Variables and drag the variable to the summary section. If you drag it to the footer, the total for the values in the group will be calculated. If you drag it to the summary, the total for all values will be calculated.

In addition to the built-in functions to calculate the number of records and the sum of a field, iReport also allows you to define other types of variable calculations. A variable is a named object that stores the result of a calculation. iReport allows you to define new variables and how those variables should be calculated. For example, you may define a variable that calculates the average for a particular field such as the area size. Or, you may wish to display the maximum value of a field. In these situations, you may define a custom variable.

To create a custom variable:

  1. Follow the steps to add a variable to an iReport.
  2. From the Calculation Type list in the Properties pane, select the calculation that you would like to perform.
Calculation types
Calculation type Description
None No type calculation performed.
Count Counts the number of non-null results.
Distinct count Counts the number of unique results.
Sum Adds the values together.
Average Averages the values together.
Lowest Returns the lowest value.
Highest Returns the highest value.
Standard deviation Returns the standard deviation of all values.
Variance Returns the variance of all values.
System No calculation is made. Instead the last value is stored.
First No calculation is made. Instead the first value is stored.
  1. From the Reset Type list, select when a variable value should be reset to the initial value. For example, suppose you wanted to count the number of accidents in each location. Each time a new group—in this case a location—is encountered, the variable should be reset. To do this, you would need to reset the value of the variable after each group.
Reset Types
Reset Type Description
None The initial value is always ignored.
Report The variable is initialised once at the beginning of the report using the Initial Expression value.
Page The variable is initialised at the top of each new page.
Column The variable is initialised in each new column.
Group The variable is initialised at each new group.
  1. If you select Group as the Reset Type, you will need to select the group on which you would like to reset the variable from the Reset Group list. The Reset Group list will contain all fields on which the report is grouped.
Note.jpg If the field on which the variable should be reset is not listed in the Reset Group list, be sure that the field is included as one of the grouping levels for the report.
  1. The Variable Expression field specifies the expression that will be provided to the variable. Typically, this will be the value of a field in the report. To specify a field in the report edit the Variable Expression field.
    Variable Expression Editor
    Variable Expression Editor

In addition to the summary functions available on the variable, specific expressions can be used in the Expression Editor to define values. For example:

Expression Operations
Operation Expression
Division $F{areaSize}/$V{REPORT_COUNT}
Addition $F{areaSize} + 500.0
Subtraction $F{areaSize} - $P{ClearedArea}
Multiplication $F{areaSize} * $V{REPORT_COUNT}
Concatenation (string only) $F{localId} + $P{LocationName}

Crosstabs

In addition to summary variables, iReport provides the capability to build crosstab tables that display data in a grid for easy analysis and summary. Crosstabs allow you to choose data rows, columns, and the variable to be measured and then automatically produce a grid of results for display in a chart. As with other summary variables Crosstabs are generally used in the Summary Band in a report.

To create a Crosstab:

  1. In the Palette pane, drag a Crosstab item to the Summary Band of the report.
  2. The Crosstab wizard displays
    Crosstab wizard
    Crosstab wizard
  3. Select the Field to use in the Row of the Crosstab grid.
    Crosstab wizard
    Crosstab wizard
  4. Select the Field to use in the Column of the Crosstab grid.
    Crosstab wizard
    Crosstab wizard
  5. Select the Field or Variable to use to represent the data in the grid. Typically this is a numeric field (e.g. areaSize) or if a count of the records is desired, the REPORT_COUNT variable.
    Crosstab wizard
    Crosstab wizard
  6. Finalise the Crosstab display.
    Crosstab wizard
    Crosstab wizard
  7. The Crosstab displays.
    Crosstab wizard
    Crosstab wizard

The report can now be run or additional adjustments to the report can be made including resizing columns and rows, number formatting, or display adjustments.

Crosstab Preview
Example Crosstab Preview

Charts

Charts provide a visual representation of the report data. Before you add a chart to your report, you should ensure that your report contains the following:

  1. At least one grouping. The report groupings are used by iReport to determine what fields may be plotted. See Modify an iReport Template for more information on grouping.
  2. At least one variable that contains a calculation. This calculation may be a count, total, or other custom calculation. These calculated variables define the size of the chart segment. The Reset type of this calculation should be set to Group and use the report grouping defined in #1. See Modify an iReport Template for more information on adding variables.

Pie Chart

Add a Pie Chart

To add a pie chart to the report:

  1. Create a report which groups the results by the attribute on which you would like to base your chart (e.g. status).
  2. Ensure that the Summary Band is available on the iReport template canvas.
  3. Create a Variable to contain the values to be displayed in the chart (e.g. SUM_areaSize_byStatus). This variable should be based on a numeric field (e.g. areaSize) and should have the Reset type set to Group and the group selected set to the field you wish to create the chart from (e.g. status).
  4. Select the Chart option from the Palette pane and drag it to the Summary Band of the report template to start the Chart Wizard.
  5. Select one of the pie chart options.
    Chart options
    Chart options
  6. Choose Main report dataset.
    Chart options
    Chart options
  7. The next step is to provide the correct data for the chart to use. Pie Charts require a unique identifier and a numeric value where the unique identifier is the field to group the data by (i.e. the names of the wedges) and numeric value is the value to sum.
    Chart options
    Chart options
  8. To select the unique value choose the Expression editor button and choose the field the report is grouped by (e.g. status). Note that charts in iReport will fail if the unique value is null. In order to account for null values, you will need to modify the expression so that null values are grouped into their own group. The expression should be modified to include the bolded text below.
    $F{status} == null ? "N/A" : $F{status}
    Set Unique Value
    Set Unique Value
  9. Next, select the numeric value that contains the desired numeric data for the chart. Note: This should always be the variable created in step 3 above (e.g. SUM_areaSize_byStatus).
    Select the desired numeric variable
    Select the desired numeric variable
  10. Choose Next.
    Chart Wizard Completed
    Chart Wizard Completed
  11. Choose Finish and the iReport template displays with the Chart.
    iReport displays with Chart
    iReport displays with Chart
  12. The report can now be previewed to ensure it is functioning as expected.
    Preview with Chart
    Preview with chart

Modify a Pie Chart

Once a chart has been created in iReport Designer, its properties can be edited by selecting the Chart Data option on the right click menu and adjusting the values and properties.

To modify a chart:

  1. Right click on the chart in iReport Designer and select Chart Data from the menu.
  2. The Chart details window displays.
    Chart Data Properties
    Chart Data Properties
  3. To edit the main properties of the chart, select the Details tab. Additionally, this screen can be used to edit the reset type of the chart which is relevant if the chart is displayed on a band other than the summary band.
  4. The Chart Details window displays.
    Chart Data Properties
    Chart Data Properties
  5. In this window, the basic properties of the chart that were established in the Chart Wizard can be edited. These include:
    • Key Expression: the field used to group data for charting purposes. To change the field, simply select another field. Note: The field must be used in the creation of the variable used in the value expression or the results will be incorrect.
    • Value Expression: the variable used to store the data to be displayed in the chart. If changes are made this value it is recommended to edit the variable properties as well.
    • Label Expression: the area used to define the labels for the chart. Any valid expression can be used here. See Variable Expressions for more details.


Bar Charts

Bar charts, unlike Pie Charts, have a third variable option that can be included in the report. In addition to the category and value expressions, bar charts add the option of a series. The series choice adds an additional possibility of grouping data though is not required.

Add a Bar Chart

To add a bar chart to the report:

  1. Create a report which groups the results by the attribute on which you would like to base your chart (e.g. status)
  2. Ensure that the Summary Band is available on the iReport template canvas.
  3. Create a Variable to contain the values to be displayed in the chart (e.g. SUM_areaSize_byStatus). This variable should be based on a numeric field (e.g. areaSize) and should have the Reset type set to Group and the group selected set to the field you wish to create the chart from (e.g. status).
  4. Select the Chart option from the Palette pane and drag it to the Summary Band of the report template to start the Chart Wizard.
  5. Select one of the bar chart options.
    Chart options
    Chart options
  6. Choose Main report dataset.
    Chart options
    Chart options
  7. Provide a Series Expression (optional).
    Series Expression
    Series Expression
  8. The Series Expression allows you to define an added level of detail to your bar chart (if desired). To select the Series choose the Expression editor button and choose one of the fields the report is grouped by (e.g. status). Note that charts in iReport will fail if the Series value is null. In order to account for null values, you will need to modify the expression so that null values are grouped into their own group. The expression should be modified to include the bolded text below. You should replace the field the name of the field that you selected above.
    $F{status} == null ? "N/A" : $F{status}
    Set Series Value
    Set Series Value
    The expression that you enter in the Series Expression field will vary based on how you want the horizontal axis to appear:
    • If you would like the horizontal axis of the bar chart to reflect a single attribute such as the chart displayed below, the Series Expression will be the same as the Category expression.
    Bar chart –Single attribute y-axis
    Bar chart –Single attribute y-axis
    • If you would like the horizontal axis of the bar chart to reflect the values of an additional attribute, the Series Expression would be the expression for the secondary level of detail. In the example shown below, the x-axis reflects the land priorities (e.g., Low, Medium, or High). In addition to displaying the priority, the bars of the chart use a different colour to reflect those land which block water access (red) vs. those that do not block the water (blue).
    Bar chart with different series expression
    Bar chart with different series Expression
    • Finally, the Series value can be left blank if desired.
  9. The next step is to provide the correct data for the chart to use. Bar charts require a category expression and a value expression where the value expression is a field to group the data by (i.e. the names of the X axis) and value expression is the value to sum.
    Category and Values
    Category and Values
  10. To select the category expression choose the Expression editor button and choose one of the fields the report is grouped by (e.g. status). Note that charts in iReport will fail if the category expression is null. In order to account for null values, you will need to modify the expression so that null values are grouped into their own group. The expression should be modified to include the bolded text below. You should replace field with the field that you selected above.
    $F{status} == null ? "N/A" : $F{status}
    Set Category Expression
    Set Category Expression
  11. Next, select the value expression that contains the desired numeric data for the chart. Note: This should always be one of the variables created in step 3 above (e.g. SUM_status_byAreaSize).
    Select the desired value expression
    Select the desired value expression
  12. Choose Finish and the iReport template displays with the Chart.
    iReport displays with Chart
    iReport displays with Chart
  13. The report can now be previewed to ensure it is functioning as expected.
    Preview with Chart
    Preview with chart

Modify a Bar Chart

Once a bar chart has been created in iReport Designer, its properties can be edited by selecting the Chart Data option on the right click menu and adjusting the values and properties.

To modify a bar chart:

  1. Right click on the chart in iReport Designer and select Chart Data from the menu.
  2. The Chart Data properties display.
  3. To edit the main properties of the chart, select the Details tab. Additionally, this screen can be used to edit the reset type of the chart which is relevant if the chart is displayed on a band other than the summary band.
  4. The Chart Details window displays
    Chart Data Properties
    Chart Data Properties
  5. For Bar Charts this presents the Category Series chooser. Typically there will be only one or two series to choose from here though more can be added at this point. Select the series to modify and choose Modify.
  6. The Chart Data properties window will display
    Chart Data Properties
    Chart Data Properties
  7. In this window, the basic properties of the bar chart that were established in the Chart Wizard can be edited. These include:
    • Series Expression: the field used to first group data for charting purposes. To change the field, simply select another field. Note: while this field is required it can be made blank or fixed by being set to a constant such as: "" or "Blank".
    • Category Expression: the field used to group data for charting purposes. To change the field, simply select another field. Note: The field must be used in the creation of the variable used in the value expression or the results will be incorrect.
    • Value Expression: the variable used to store the data to be displayed in the chart. If changes are made this value it is recommended to edit the variable properties as well.
    • Label Expression: the area used to define the labels for the chart. Any valid expression can be used here. See Variable Expressions for more details.
Standardising Data Analysis and Information Reporting
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