[Solved] Rad ComboBox OnClientSelectedIndexChanged Event check seletedIndex to Submit() form

[Trong]

Hi all,
I've problem with ComboBox when I change selectItem  from combobox. I want to check selectedIndex if value >0 then submit form else not submit form.
Please help me!

[Simon]

Hi Trong,

You could hook to the OnClientSelectedIndexChanging client event of RadComboBox, check the condition in the event handler and cancel the event if required. Further, if you had subscribed to the server OnSelectedIndexChanged event, a postback will be made in case you have not canceled the [...]Changing event.

More information about the needed client-side event you could find here: OnClientSelectedIndexChanging.

Kind regards,
Simon
the Telerik team

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[Trong]

Hi Simon,
My problem:
Example: I've ComboBox with 3 item
    1. Select Country
    2. Viet Nam
    3. USA

When i choose item 0 (Select Country), I don't want submit form.
OnClientSelectedIndexChanging event raising before Combo change value.
I don't known how to check which item choosed (Select Country or Viet Nam or USA). I have to using OnClientSelectedIndexChanged event.But I can't stop form submit (return false;)

Please help me,
Thanks!

[Simon]

Hi Trong,

You can access the Item that is about to be selected by calling eventArgs.get_item() in the OnClientSelectedIndexChanging event handler.

Another approach for accomplishing the same goal is by using ASP.NET validation as shown in our online example RadComboBox Validation.

Best wishes,
Simon
the Telerik team

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[Trong]

Thanks Semon!
I use  RadComboBox Validation.