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I have the following code where 2 drop downs are available on the UI. When I select value "1" of drop down 1, the drop down 2 should be disabled. When I select value "1", the dropdown 2 is disabled. But I am not able to re-enable the drop down 2 when the user select value "2" from drop down 1. I am not sure since I am calling the performValidation() method for onClick event of both the options in drop down 1.

Code:

<html>
<head></head>
<script = "text/javascript">
     function performValidation()
     {
           if (document.mainForm.criteriaOne.value == "1")
           {
                document.mainForm.criteriaTwo.options.length = 0;
                document.mainForm.criteriaTwo.disabled = true;
           }
           else
                document.mainForm.criteriaTwo.disabled = false;
     }
</script>
<body>
        <form name="mainForm" action= "" method ="get">
              Criteria One:<select id = "criteriaOne">
             <option value = "1" onClick ="performValidation()"> Select One - One</option>
             <option value = "2" onClick ="performValidation()"> Select one - Two</option>
              </select>
              Criteria Two:<select id = "criteriaTwo">
             <option value = "1" onClick ="performValidation()"> Select Two - One</option>
              </select>
         </form> 
</body>
</html>

I have the following code where 2 drop downs are available on the UI. When I select value "1" of drop down 1, the drop down 2 should be disabled. When I select value "1", the dropdown 2 is disabled. But I am not able to re-enable the drop down 2 when the user select value "2" from drop down 1. I am not sure since I am calling the performValidation() method for onClick event of both the options in drop down 1.

Code:

<html>
<head></head>
<script = "text/javascript">
     function performValidation()
     {
           if (document.mainForm.criteriaOne.value == "1")
           {
                document.mainForm.criteriaTwo.options.length = 0;
                document.mainForm.criteriaTwo.disabled = true;
           }
           else
                document.mainForm.criteriaTwo.disabled = false;
     }
</script>
<body>
        <form name="mainForm" action= "" method ="get">
              Criteria One:<select id = "criteriaOne">
             <option value = "1" onClick ="performValidation()"> Select One - One</option>
             <option value = "2" onClick ="performValidation()"> Select one - Two</option>
              </select>
              Criteria Two:<select id = "criteriaTwo">
             <option value = "1" onClick ="performValidation()"> Select Two - One</option>
              </select>
         </form> 
</body>
</html>
  • javascript
  • html
Share asked Mar 24, 2011 at 19:59 name_maskedname_masked 9,82344 gold badges124 silver badges174 bronze badges 1
  • Not sure, your code works for me as is in Firefox 4.0 – Duniyadnd Commented Mar 24, 2011 at 20:18
Add a ment  | 

2 Answers 2

Reset to default 2

You need to wire up a function to the onchange event on the select something like

document.getElementById("criteriaOne").onchange = function() 
         { // do some work to check the selectedIndex and determine whether to re-                enable the other drop down}

You don't necessarily need 

document.mainForm.criteriaTwo.options.length = 0;

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