How to get which button is clicked?

Question

I want to check some condition when a particular button is clicked how to do this?

 $(document).ready(function () {
         var prm = Sys.WebForms.PageRequestManager.getInstance();
         prm.add_initializeRequest(InitializeRequest);
         prm.add_endRequest(EndRequest);
         Search("Other");


     });

     function InitializeRequest(sender, args) {
     }

     function EndRequest(sender, args) {
         alert(sender._postBackSettings.sourceElement.id)
         var str1 = new String(sender._postBackSettings.sourceElement.id);
         if (sender._postBackSettings.sourceElement.id == ContentPlaceHolder1_btnNew) {
             alert("You have clicked new")
             Search("NEW"); 
         }

         else {
         alert("OTHERS")
             Search("Other");
          }


     }

Answer 1

I got the solution by assigning it to a string value and checking in if condition as string.

 $(document).ready(function () {
         var prm = Sys.WebForms.PageRequestManager.getInstance();
         prm.add_initializeRequest(InitializeRequest);
         prm.add_endRequest(EndRequest);
         Search("Other");


     });

     function InitializeRequest(sender, args) {

     }

   function EndRequest(sender, args) {

         var str1 = new String(sender._postBackSettings.sourceElement.id);

         if (str1 == "ContentPlaceHolder1_btnNew") {                
            alert("You have clicked new")
         }

         else {
          alert("You have clicked others")
         }

     }