Validate ComboBox via Javascript

[Craig Hinkel]

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

[Shinu]

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.

[Craig Hinkel]

Thank you, that code worked perfectly.

[Vijay]

I am getting this error while using the above code 

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

[Eyup]

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
Telerik