javascript - JS Code to remove selected options works with Firefox but not IE11 -


my code (found topic : deselect selected options in select menu multiple , optgroups) :

function clearselected(id) {     var select = document.getelementbyid(id);     for(var = 0, len = select.options.length; < len; i++){         select.options[i].selected = false;     } }

where id = id of select element contain list of options.

if run script on firefox, ok, selected options unselected. when run ie 11, doesn't work. idea of what's wrong ? tried run console, haven't error , ie correctly identifying select , options. let me know if need further info.

edit : options content of focused select dynamically generated in javascript. may not compatible ie ?

<select name="listechoix3alt" id="listechoix3altid" size="9" class="formaa" onchange='filltheselect(this.name, this.value)' style="width:330px; display: none;">                 <script language="javascript">                     (i=0; i<art7.length; i++)                     document.write("<option value=\"" +art7[i][0]+ "\">" +art7[i][1]+ "</option>");                 </script>             </select>

edit2 : i've made additional tests :

<select name="listechoix3alt" id="listechoix3altid" size="9" class="formaa" style="width:330px; display: none;">                 <option value="n0">cds fermé</option>                 <option value="n1">compte bloqué</option>                 <option value="n2">pas de place sur le planning</option>                 <option value="n3">pas de produit disponible dans le délai attendu par le client</option>             </select>             <a href="#" onclick="clearselected('listechoix3altid');">clear</a>

when click on clear firefox, working fine. ie, nothing happens ! make me crazy !


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