Calculation of Chart Values

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Tuesday, March 10, 2015PrintSubscribe
Calculation of Chart Values

If a chart does not have a value field specified, the chart will take a count of records that fall into the row and column group. For example, if the EmployeeID data field in the Orders controller is specified as a row field, then the count of Orders will be used as the value.

Data Field Tag
EmployeeID pivot1-row1-bar

The chart uses the count of records in each row.

The chart data shows that the count of Orders is used as the value.

The data shows the count of records in each group.

In order to use a different value for the chart, a value field must be specified. Tag the data field that you wish to use with the correct pivot ID and assign it “val” plus the order for the data field. The example below will use Freight field as a value.

Data Field Tag
EmployeeID pivot1-row1-bar
Freight pivot1-val1

The count of Freight is used in the graph.

Notice that the values are the same! That is because the value mode of Freight is the default “count”. You must specify a value mode to manipulate the number. The example below will use the sum of Freight by using the keyword “sum”.

Data Field Tag
EmployeeID pivot1-row1-bar
Freight pivot1-val1-sum

The sum of freight is used as the value in this chart.

The correct sum can be seen in the chart and data.

The chart date shows the correct value, the sum of Freight.

The table below shows a list of the available value modes.

Keyword Description
count The default mode. Will count every record.
sum Will summate the value in every record in the row/column group.
min The smallest value in the group.
max The largest value in the group.
avg The sum divided by the count.