javascript - why __dopostback not working in firefox and IE? But working in chrome -

i converting address in latitude , longitude.

here code

 <script type="text/javascript">    function codeaddress() {       if (page_clientvalidate()) {           var address = $(".hno").val() + " " + $(".address").val() + "," + $(".city").val();           try {               // fetch lattitude , logtittude using google map               var geocoder = new google.maps.geocoder();               geocoder.geocode({ 'address': address }, function (results, status) {                   if (status === google.maps.geocoderstatus.ok) {                       console.log(results[0]);                       var location = results[0].geometry.location;                       $('[id*=hdnlat]').val(location.lat());                       $('[id*=hdnlng]').val(location.lng());                       javascript: __dopostback('cmiddle1$btnupdate', '');                   }                   else {                       alert("please putt address info correctly");                   }               });                return false;           }           catch (err) {               alert(err);           }       }   } </script> 

and here link button

  <asp:linkbutton id="btnupdate" runat="server" cssclass="btn" text="submit" causesvalidation="true" validationgroup="eregister" onclientclick="return codeaddress();"></asp:linkbutton> 

and onclick event declared when page prerender

   this.btnupdate.click += new system.eventhandler(this.btnupdate_click); 

i alert latitude , longitude before __dopostback , alert works fine. __dopostback not working .