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Load On Demand and Required Field Validator

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ComboBox
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Anderson
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Anderson asked on 22 May 2008, 04:04 PM
We are using a RadComboBox with the load on demand feature as demoed here:
http://www.telerik.com/demos/aspnet/prometheus/ComboBox/Examples/PopulatingWithData/AutoCompleteSql/DefaultCS.aspx

We have a required field validator associated with this ComboBox.  In the case that a user types in some gibberish and hits "submit", since a valid option was not selected, we would expect the required field validator to fire on the client-side and stop the postback, but this is not the case.

Is there something I'm missing here?

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Veselin Vasilev
Telerik team
answered on 26 May 2008, 08:35 AM
Hello Anderson,

The RequredFieldValidator checks if there is a text in the input area of the combobox. In your case this is true and the page is considered valid.

I suggest that you use a CustomFieldValidator. Here is how you can accomplish the task:

<asp:CustomValidator ID="CustomValidator1"  
    runat="server"  
    ControlToValidate="RadComboBox1" 
    ValidateEmptyText="True" 
    ClientValidationFunction="validateCombo" 
    ErrorMessage="You have to select an item from the list"
</asp:CustomValidator> 

<script type="text/javascript"
function validateCombo(source, args) 
   args.IsValid = false
   var combo = $find("<%= RadComboBox1.ClientID %>"); 
   var text = combo.get_text(); 
   var item = combo.findItemByText(text); 
   if (item) 
   { 
       args.IsValid = true
   } 
</script> 

I hope this helps.

Greetings,
Veskoni
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n
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answered on 16 Jan 2009, 04:21 PM
Hi there,

I need to obtain a reference to the combobox using the parameter source, wich is the customvalidator. I can obtain the combobox ID via  source.coontroltovalidate.
But , then, i can't obtain the reference to the combo element rigth, since when it tries to get the Text (combo.GetText) , it's says the object does not contains that method.

Can I please get some help on how i can get this working.

thanks,Nuno.
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Veselin Vasilev
Telerik team
answered on 19 Jan 2009, 12:42 PM
Hello Nuno,

GetText() is a method of the "classic" RadComboBox. Do you use that version?
If you are using RadControls for ASP.NET AJAX you need to use get_text() as shown in my previous post.


All the best,
Veselin Vasilev
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n
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answered on 19 Jan 2009, 01:01 PM
Hello,

Yes, I am using that version.


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Veselin Vasilev
Telerik team
answered on 20 Jan 2009, 01:49 PM
Hi Nuno,

Maybe you are not obtaining a proper reference to the RadComboBox.

Can you please paste here some relevant code so we can observe it.


Greetings,
Veselin Vasilev
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answered on 20 Jan 2009, 06:49 PM
Im associating a custom Control to the RadComboBox, and then on the Client Side i doing something like this

 
function validateCombo(source, args) {  
  args.IsValid = false;  
  var combo = document.getElementById(source.controltovalidate); //I want a reference to the radcombobox on the client side
 
 
  var text = combo.GetText();  
 }  


Thanks,Nuno.
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Veselin Vasilev
Telerik team
answered on 23 Jan 2009, 03:43 PM
Hello,

You need to get a reference to the combobox in the following way:

var combo = <%= source.controltovalidate %>; 


Best wishes,
Veselin Vasilev
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answered on 02 Feb 2009, 09:45 AM
Hi there,

I cant use those server side tags...
I need to get the reference do the radcombobox on the client side.

Thanks.

Nuno.
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Veselin Vasilev
Telerik team
answered on 03 Feb 2009, 03:14 PM
Hello Nuno,

Please check this article:
Getting the Client-Side Instance of Telerik RadComboBox

Greetings,
Veselin Vasilev
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