Javascript & ASP.NET - Manage CheckBoxList -

i have checkboxlist dinamically filled db.

<asp:checkboxlist id="chklist1" runat="server" onclick="chklist1_onclick()" /> 

oce has been filled have several options , 1 of them has text "no response".

what want javascript function following:

1) if check "no response" other options must unchecked.

2) if check @ least 1 of options not "no response", "no response" option must unchecked.

hope clear. in advance.

my attempt was:

    function chklist1_onclick() {     var chklist1 = document.getelementbyid('<%= chklist1.clientid %>');     var chklist = chklist1.getelementsbytagname("input");     (var = 0; < chklist.length; i++) {         if (chklist[i].checked && chklist[i].value == "6") {             (var = 0; < chklist.length; i++) {                 if (chklist[i].checked && chklist[i].value != "6") {                     chklist[i].checked = false;                  }             }         }     } } 

where 6 value of "no response" item. way resolve case 1)

assuming no response checkbox has value="" try following script:

<script type="text/javascript">     window.onload = function () {         var noresponsecheckboxfilter = function(item) {             return item.value == '';         };         var othercheckboxesfilter = function(item) {             return !noresponsecheckboxfilter(item);         };          var childinputs = document.getelementbyid('<%= chklist1.clientid %>').getelementsbytagname('input');         var checkboxes = array.prototype.slice.call(childinputs, 0).filter(function (item) {             return item.type == 'checkbox';         });         (var = 0; < checkboxes.length; i++) {             checkboxes[i].onclick = function () {                 if (this.value == '') {                     if (this.checked) {                         // uncheck other checkboxes                         var othercheckboxes = checkboxes.filter(othercheckboxesfilter);                         (var j = 0; j < othercheckboxes.length; j++) {                             othercheckboxes[j].checked = false;                         }                     }                 } else {                     // uncheck no response checkbox                     checkboxes.filter(noresponsecheckboxfilter)[0].checked = false;                 }             };         }     }; </script> 

if no response checkbox has different value empty string adapt tests in previous example.