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 开发者_JAVA技巧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>
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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