javascript - jQuery Ajax Race Condition best practice -


in button.click(function(){}); have following code:

var userid = $("#user-permission-edit").val();         var peid = $("#user-permission-entity-list").val();         var newparentpeid = $("#new-parent-pe").val();         var newpename = $("#pe-name-add").val();          $.ajax({             type: "post",             url: 'addnewpe',             data: { 'targetuserid': userid, 'targetpeid': peid, 'newpeparentid': newparentpeid, 'newpename': newpename},             success: function (data) {                 var dataobj = jquery.parsejson(data);                 console.log(dataobj);                  if (dataobj.status == "success") {                     alert("permissions have been updated.");                 }                 //update user pes combo              }         });

however, concerned of possible race condition of variables not getting values in time ajax call.

would safer?

  var userid = $("#user-permission-edit").val();     var peid = $("#user-permission-entity-list").val();     var newparentpeid = $("#new-parent-pe").val();     var newpename = $("#pe-name-add").val();       $.when(function() {          userid = $("#user-permission-edit").val();          peid = $("#user-permission-entity-list").val();          newparentpeid = $("#new-parent-pe").val();          newpename = $("#pe-name-add").val();      }).done(function() {         $.ajax({             type: "post",             url: 'addnewpe',             data: { 'targetuserid': userid, 'targetpeid': peid, 'newpeparentid': newparentpeid, 'newpename': newpename},             success: function (data) {                 var dataobj = jquery.parsejson(data);                 console.log(dataobj);                  if (dataobj.status == "success") {                     alert("permissions have been updated.");                 }                 //update user pes combo              }         });      });

is necessary?

the $('....').val() method synchronous call - script execution won't continue past line until have received value of element.


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