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Javascript to clear a listbox Question: How can I clear a listbox using Javascript? Answer: Use the code below. Call it by passing the listbox object to function clearlistbox() function clearlistbox(lb){ for (var i=lb.options.length-1; i>=0; i--){ lb.options[i] = null; } lb.selectedIndex = -1; } // call it like this clearlistbox(listbox1);