When you load the combobox items on demand (in the ItemsRequested event) the AllowCustomText property is enabled by default. You cannot disable it as this would break the load-on-demand mechanism.
The ItemsRequested event is fired when the user types in the Telerik RadComboBox input field or clicks the drop-arrow image. Disabling the AllowCustomText property would prevent the user from typing in the input field and this would break the load-on-demand mechanism. Therefore we decided that the best approach is to hard-code the value of the AllowCustomText property and set it to true when the combobox is in a callback mode.
WORKAROUND
To work around the problem you could use the following approach:
Example:
| ASPX |
 Copy Code |
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<script>
//Hook on the OnClientDropDownOpening event and in its event handler call the RequestItems method -
//to add the items
function AddItems(combo)
{
combo.RequestItems();
}
</script>
//Hook on the ItemsRequested event without enabling the EnableLoadOnDemand property
//Thus, the AllowCustomText property will not be enabled by the combobox
<rad:radcombobox
id="RadComboBox1"
runat="server"
OnItemsRequested="RadComboBox1_ItemsRequested"
OnClientDropDownOpening="AddItems"
AllowCustomText="false">
</rad:radcombobox> |
| C# |
Copy Code |
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protected void RadComboBox1_ItemsRequested(object o, Telerik.WebControls.RadComboBoxItemsRequestedEventArgs e)
{
RadComboBox1.Items.Add(new RadComboBoxItem("item1", "1"));
RadComboBox1.Items.Add(new RadComboBoxItem("item2", "2"));
RadComboBox1.Items.Add(new RadComboBoxItem("item3", "3"));
} |