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→Add a Bar Chart
#*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).
#:[[Image:iRep31.png|center|500px|''Figure 31. Bar chart with different series expression'']]<div align="center">''Figure 31. Bar chart with different series Expression''</div>
#* '''Finally, the Series value can be left blank if desired.'''# The next step is to provide the correct data for the chart to use. Bar charts require a '''cstegory 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.
#:[[Image:iReport Chart Bar2.png|center|500px|''Category and Values'']]<div align="center">''Category and Values''</div>
# 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.