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disable field based on drop down

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I was wondering if it is possible to disable certain fields in a from based on which drop down is selected. If so could someone help me out i've been looking on the web and haven't found anything. Thanks.

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You'll need to set a javascript function to disable and enable fields when the select menu is changed.

The select menu will look something like this
[code]<select onChange="disable_fields(this.value);">
<option value="....">....</option>

In your javascript add a function -disable_fields()
function disable_fields(val){
     if (val == "...."){
          // disabling the field
          document.getElementById('field_id').disabled = true;
     else {
          // enabling the field
          document.getElementById('field_id').disabled = false;        

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