A summary widget displays the count of features or a summary statistic for a field for a collection of features.
You can include text before or after the value to explain the summary information. For example, a summary that indicates values from a field that represent currency can include leading text for the currency symbol. Similarly, for a summary that indicates some measure, the units can be included as trailing text. Leading or trailing text can both be included. The significance of the value displayed is more apparent when units or other qualifying text is displayed with it.
This summary widget shows the average speed of all ambulances in the city. Speed: is leading text, 25.00 is the average field value, and km/h is trailing text.
When a single feature serves as the data source, the value for the chosen field is shown in the widget. If more than one feature is used, such as when there are multiple selected features, a summary operation is performed on the field values. The aggregate can be any one of the following: