Enable/Disable RequiredFieldValidator with Javascript

Sometimes you may need to enable/disable validators on client side. you can easily do this using ValidatorEnable function in the Asp.net javacsript Script Library. Here is an example:

<script language="javascript" type="text/javascript"> function EnableDisableVote() { var radio = document.getElementById('<%= rdoYesNo.ClientID %>'); var radioArray = radio.getElementsByTagName("input"); var isChecked = false; for (var i = 0; i < radioArray.length; i++) { var item = radioArray[i]; if (item.type == "radio" && item.checked) { isChecked = true; if (i > 0) { document.getElementById('<%= TextBoxCaseNotes.ClientID %>').disabled = false; ValidatorEnable(document.getElementById('<%= RequiredFieldValidatorCasseNotes.ClientID %>'), true); } else { document.getElementById('<%= TextBoxCaseNotes.ClientID %>').value = ''; document.getElementById('<%= TextBoxCaseNotes.ClientID %>').disabled = true; ValidatorEnable(document.getElementById('<%= RequiredFieldValidatorCasseNotes.ClientID %>'), false); } break; } } if (isChecked && document.getElementById('<%= ChkIagree.ClientID %>').checked) { document.getElementById('<%= ButtonVote.ClientID %>').disabled = false; } else document.getElementById('<%= ButtonVote.ClientID %>').disabled = true; } </script>