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Before and after callback events
Additional grid functionality, that needs to get processed both before and after a Call back request is sent to the server, and before and after the processing of the Callback results, can be included in the GridGroupingControl by means of scripting. The callback return event handler, on the client, will execute this script.
The screen shots given below best illustrate this feature. The combobox displays the filter options for the grid column 'ContactTitle' changing whose value will trigger filtering grid records by the selected value of the combobox.
Selecting filter option raises callback request
Disabling Combobox - before callback results
Filtered grid after callback results - Combobox enabled
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