How to Use JavaScript in Controller Class...

Hi All,
Can any one tell me how to use JavaScript in Controller Class.
Requirement is:
I have
Radio Group(RG1),
Two Radio Buttons(RB1,RB2),
Two messageTextInput(MTI1,MTI2),
if i click RB1 i should Prompt to the end user to "Enter value for MTI1" or
If i click RB2 i should prompt "Enter value for MTI2" while submitting page.
Please let me know the steps to use JavaScript and the above client validation...
Regards
Alem...

Using javascript is against the standard. I can tell you a workaround instead of you setting the javascript, check if that would be acceptable.
You can use PPR and set the required property on the messageTextInput on clicking of the radio button. By doing this you will let UIX generate the javascript for you to handle the client side validation. But the validation will happen only on click of the submit button. The visual indicator is good enough to tell that the value has to be entered to the item.

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