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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"><head> <script src="http://code.jquery.com/jquery-2.1.1.min.js"></script> </head><body> <select id="predefflst" name="predefflst[]" multiple size="15" scroll="no"> <option value="probably null">Probably Null</option> <option value="probably damaging" >Probably Damaging</option> <option value="possibly damaging" >Possibly Damaging</option> <option value="probably benign" >Probably Benign</option> <option value="probably benign" >Probably Benign</option> <option value="probably benign" >Probably Benign</option> <option value="probably benign" >Probably Benign</option> <option value="probably benign" >Probably Benign</option> <option value="probably benign" >Probably Benign</option> <option value="probably benign" >Probably Benign</option> <option value="probably benign" >Probably Benign</option> </select></body></html>$("select[multiple] option").change(function(){ alert($(this).prop("selected")); if ($(this).prop("selected")) $(this).prop("selected", false); else $(this).prop("selected", true); return false; });
Output
300px
300px
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