Radcombobox not updating

17-Jul-2020 13:54

Thanks, it's the Is Editable issue that is causing the problem for us - I wasn't aware of that specific behaviour.

My example data item doesn't implement INotify Property Changed, but our actual data items do, so they update correctly.

A working solution would be wrapping the combobox and the controls that will be updated with an AJAX Panel.

You should, however, keep into account that you should not use the built-in callback machinism of Telerik Rad Combo Box along with Telerik Rad Ajax.

I have created a simplified example illustrate this problem. So in the image above, I have a Text Block (in black) that shows the 'Selected Person. The First Name and Last Name properties of the Selected Person are shown in the 2 Text Boxes below the Full Name.

The Combo Box Display Member Path is bound to 'Full Name' and the combobox contains a list of Person objects.

However, it is ONLY updating correctly in the Text Block.

Since the Items Requested event is fired when a callback is initiated form the client-side, all controls that are being updated in the Items Requested event handler will lose the changes after the callback.

This behavior is due to the async (callback) request that is made to fire the Items Requested event.

This article shows how to add a default item (like "Select a country") that does not belong to the datasource of a databound Rad Combo Box.

The mandatory thing to do is to set the Append Data Bound Items property of the combobox to section) or in the code behind.

I have inherited an application that uses telerik controls.

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