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Validate ComboBox via Javascript

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ComboBox
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Craig Hinkel
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Craig Hinkel asked on 19 Jan 2009, 07:18 PM
Hello,

I am trying to validate a valid item is typed into one of my combo's with load on demand enabled and I am having a hard time with the javascript. I want to re-use a function for multiple combobox's.
        function ValidateComboUser(source, args)    
        {            
            var combo = $find(source.ControlToValidate.ClientID);   
            args.IsValid = ValidateCombo(combo);  
        }            
         
        function ValidateCombo(combo)  
        {  
           var isValid = false;    
           var text = combo.get_text();    
           var item = combo.findItemByText(text);    
             
           if (item)    
           {    
               isValid = true;    
           }   
             
           return isValid;  
        }  

Can someone please help me with a way to get the combo box being validated through the function params?

Thanks

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Shinu
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answered on 20 Jan 2009, 07:32 AM
Hello Craig,

Try the following client-side function to validate the RadComboBoxItem.

JavaScript:
function ValidateComboUser(source, args)     
    var combo = $find(document.getElementById(source.id).getAttribute("controltovalidate"));  
    args.IsValid = ValidateCombo(combo); 
function ValidateCombo(combo) 
{   
   var isValid = false;     
   var text = combo.get_text();     
   var item = combo.findItemByText(text);  
   if (item)     
   {     
       isValid = true;     
   }      
   return isValid;   
}   

Thanks,
Shinu.
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Craig Hinkel
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answered on 20 Jan 2009, 05:18 PM
Thank you, that code worked perfectly.
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Vijay
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answered on 12 Aug 2015, 08:32 AM

I am getting this error while using the above code 

Uncaught Sys.ArgumentNullException: Sys.ArgumentNullException: Value cannot be null

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Eyup
Telerik team
answered on 17 Aug 2015, 07:21 AM
Hello Vijay,

Do you have RadGrid on the page? If this is the case, the error may arise due to the following issue:
http://www.telerik.com/forums/value-cannot-be-null-parameter-name-key-exception-is-thrown-after-q2-2015-release

It is already fixed and you can download the latest release version to test that.

Regards,
Eyup
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ComboBox
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Craig Hinkel
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Shinu
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Craig Hinkel
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Vijay
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Eyup
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