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Reload RadComboBox on changing of other asp form elements

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Conor
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Conor asked on 24 Nov 2014, 01:19 PM
I'm trying to get a RadComboBox to reload when any of 5 .asp form elements in the page are changed.

For example, I have an asp textbox calender, which, if changed, I want to trigger a reload of a RadComboBox as a change of date changes availability of the options in the combobox.

Is there a simple way of doing this using, say the "onchange" function in the asp form element? Any assistance on the simplest method to achieve this would be welcome.

Thanks in advance.

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Conor
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answered on 24 Nov 2014, 02:49 PM
In case it makes a difference, this RCB is being populated by a web service.
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Boyan Dimitrov
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answered on 27 Nov 2014, 11:21 AM
Hello,

I would like to clarify that the change event is fired for <input>, <select>, and <textarea> elements when a change to the element's value is committed by the user.

In this case I would suggest subscribing for each control's client event that is fired when user interaction with the control occurs and request the RadComboBox items. You can do that by calling the RadComboBox client-side object requestItems method as explained in this help article.

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Boyan Dimitrov
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Conor
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answered on 28 Nov 2014, 09:52 AM
Thanks for the reply.

I've implemented an onchange function in the asp form elements to call a function when the field is changed, I'm just having difficulty getting the function that fires a reload of the RCB to work.

If my RCB is called myRadComboBox - what do I need to do to this?

<script language="javascript" type="text/javascript">
 function myReloadFunction() {
     var combo = $find(myRadComboBox);
     combo.requestItems();
 }
 </script>

Thanks!
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Boyan Dimitrov
Telerik team
answered on 03 Dec 2014, 09:50 AM
Hello,

You can pass an empty string in order to request all items from the web service.
//code
combo.requestItems("", true);


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Boyan Dimitrov
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Conor
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answered on 03 Dec 2014, 10:00 AM
Many thanks, Boyan.

I actually got it working last night - using the empty string you've just suggested.

Conor
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Boyan Dimitrov
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