Combobox with EnabledLoadOnDemand

[Grigory]

Hello!  If it's possible to disable user input in radcombobox with enabled load on demand set to true?  

I have a problem with user input in radcombobox, user could type everything in radcombobox and after submit when I'm trying to convert SelectedValue to integer there is an exception.  If it possible to select items or type only non-custom text?

[Princy]

Hi Grigory,

Try the following JavaScript to disable user input in RadComboBox.

JS:

<script type="text/javascript">
  function pageLoad()
    {
        var combo =  $find("<%= RadComboBox1.ClientID%>");
        var input = combo.get_inputDomElement();
        input.disabled = "disabled";
    }
</script>

Hope this helps.

Regards,
Princy.

[Grigory]

Thanks a lot , Princy

[Grigory]

But if it possible to prevent text typing which don't exist in Item list?

[Ivana]

Hi Grigory,

If you have load-on-demand enabled for RadComboBox in your scenario, there is no need to add a functionality that will prevent the typing in the input area if it does not match any item from the ItemsCollection of the control. When the user starts typing, no items will be fetched from the data source if there are no matches.
Take a look at the following online demo for more information on load-on-demand:
http://demos.telerik.com/aspnet-ajax/combobox/examples/populatingwithdata/autocompletesql/defaultcs.aspx.

Regards,
Ivana
the Telerik team

[Grigory]

http://screencast.com/t/efCwZi4PXfC6

Can you see the screenshot? 

Yes there are empty list while I'am typing something wrong to the combobox input, but if I click outside the combobox the incorrect value will be selected. In my scenario on postback there are selected value parse to integer  and if there are no value which I typed there will be exception .. 

[Shinu]

Hi Grigory,

As far as I know it is not possible to disable typing according to the RadComboBoxItem. One suggestion is that you can check in the SelectedIndexChanged event as follows.

C#:

protected void RadComboBox1_SelectedIndexChanged(object sender, Telerik.Web.UI.RadComboBoxSelectedIndexChangedEventArgs e)
    {
        int i=0;
        foreach (RadComboBoxItem item in RadComboBox1.Items)
        {
            if (item.Text == RadComboBox1.Text)
            {
                i = 1;
            }
        }
        if (i == 0) //Typed text is not RadComboBoxItem
        {
            RadComboBox1.Text = "";
            //Your code
        }
        else  //Typed text is a RadComboBoxItem
        {
            //Your code
        }
    }

Hope this helps.

Thanks,
Shinu.

[Ivana]

Hi Grigory,

If you are using server-side loading of items, you could an 'if'  check to your code which will make sure that the number of items being loaded is not zero; if it is zero, however, you should clear the text of the RadComboBox like this:

RadComboBox1.Text = "";

If you, on the other hand, are loading items from a Web server you could take advantage of the OnClientItemsRequested event where you could check the number of items being loaded from the service. Just like in the previous case, If this number is zero then you set the text of RadComboBox to empty string.

I hope this will help.

Greetings,
Ivana
the Telerik team

[Grigory]

Thanks a lot to both of you!