[Alfresco] login using Jquery

/**
 * authentication
 */

$(function(){
 //dologin
 $("#login_submit").click(function(){
  var username = $("#username").val();
  var password = $("#password").val();
  if(username == "" || password == ""){
   alert("Invalid UserName or Password.");
  }else{
   //call resetful api
   
   var endpoint = "http://localhost:8080/alfresco/service/api/login?u=" + username + "&pw=" + password + "&format=json";
   alert(endpoint);
   $.ajax({
     type: "GET",
     headers: {
                 "Content-Type": "application/json"
     },
     url: endpoint,
     //contentType: "application/json",
     processData: false,
     //data: stringData,
     dataType: "jsonp",
     jsonp:"alf_callback",
     jsonpCallback:"jsonp_callback_login",
     statusCode: {
        404: function() {
          alert('page not found');
        },
     400: function() {
           alert('bad request');
         }
     }
   });
  }
 });
});

function jsonp_callback_login(data){
 alert(data.data.ticket);
}