Grid popup editor. How to update field value on drop down list change

[Robert Smallwood]

I have a grid set up with my datasource and working properly with popup editing. My popup has two drop down lists and a number field. What I would like to do is set the value of the number field to a specific value when the user makes their selection from the first drop down list, essentially pre-populating the number value to "highest entered value for the user selected item + 5". 

Is there a way to hook up to the "change" event for the  drop down list in the popup editor and as part of the function for the change event, query the current dataset bound the grid to retrieve a value, then set that value to the numeric field in the popup editor?

Robert 

[Daniel]

Hello,

You could use the dataSource change event to update the value e.g.

function change(e) {
    if (e.action == "itemchange" && e.field == "DropDownField") {
        var item = e.items[0];
        item.set("NumberField", item.DropDownField + 5);
    }
}

If you wish to bind to the dropdown change event then you could set the handler through the configuration if you are using custom editor or in the grid edit event if you are using a foreignkey column.

Regards,
Daniel
Telerik