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Do disable an option in drowdown  RSS feed

 
Parul Tripathi
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Hi, I am using html:select and htmlptioncollections tag for html drowdown. I want a code in javascript that would disable city option in second drop down if city option is selected in first dropdown. document.forms[0].selectProperty[0].disabled = true is not working. Can any please let me know the code
 
Consider Paul's rocket mass heater.
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