禁用必填字段验证器

Question

this is my javascript code here i am unable to disable the textbox(id="due_Date") when i get the zero or negative amount in text feild (id="subtotal_input") ...any help would be appreciated....

  <script>
    window.onload = function() 
    {
       document.getElementById('subtotal_input').onchange = disablefield;
       document.getElementById('phone_no').onchange = disablefield;
       document.getElementById('phone_yes').onchange = disablefield;
     }

     function disablefield()
     {
         if ( document.getElementById('subtotal_input').value <= 0 )
         {
         document.getElementById('due_Date').value = '';
         document.getElementById('due_Date').disabled = true
         }


         if ( document.getElementById('phone_no').checked == true )
         {
         document.getElementById('ReturnDate').value = '';
         document.getElementById('ReturnDate').disabled = true}
         else if (document.getElementById('phone_yes').checked == true ){
         document.getElementById('ReturnDate').disabled = false;
         }

    }

Answer 1

You can use ValidatorEnable(validator, enable) to enable or disable a validator.

You can use something like this:

objValidator = document.getElementById("<%=YourRequiredValidatorID.ClientID %>");
objValidator.enabled = true; //'true' if you want to enable else 'false'
ValidatorUpdateDisplay(objValidator);

Let me know if it works for you!