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SelectedValue and LoadOnDemand

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ComboBox
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Brady
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Brady asked on 22 Apr 2009, 11:27 AM
I'm using Telerik RadComboboxes in an ASP.NET application, but find myself at a dilemma with using load-on-demand.  When I load the page for an exiting item, my current code depends on the value for certain fields to already exist in the combo, e.g. when I assign a site ID to the SelectedValue of a combo during page load, the callback for loading items fails, somehow because the value doesn't already exist in the combo.

Is there a proper way to handle load on demand for existing items that already have values for combos, when the combos aren't loaded yet, or do I simply have to code my whole form twice, once for inserting new items, and once for editing existing items?

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Veselin Vasilev
Telerik team
answered on 24 Apr 2009, 02:37 PM
Hello Brady,

I suppose that the combobox is in EditItemTemplate of RadGrid or FormView.

In this case you can set the SelectedValue property of the combo like below:

SelectedValue='<%# Bind("ID") %>'

Let us know if this helps.

Greetings,
Veselin Vasilev
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Brady
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answered on 24 Apr 2009, 02:43 PM
Veselin, this doesn't help, as I get an error that the ID field doesn't exist in the data source for the combo.  Remember we are dealing with two data sources here:  The first provides the list of items in the combo, and the second provides the selected value.

By the way, the combo is on a User Control, used in Pop-up edit mode of the grid, not in a template.
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Veselin Vasilev
Telerik team
answered on 27 Apr 2009, 07:59 AM
Hi Brady,

The ID was only a sample, you need to put here the name of the column holding the value of the combobox.

If it does not help - please open a new support ticket and attach a sample project there. We will inspect the code and provide you a solution.

All the best,
Veselin Vasilev
the Telerik team

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Veselin Vasilev
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Brady
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