variable scope issue in jQuery post method -

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• how return response asynchronous call? 25 answers

i trying information database , make chart them. unfortunately, variables use store values losing data outside of post. completed , ongoing assigned inside post methods, each other's post methods, not outside of it. when data2 executes, variables become empty again. how can fix issue?

var completed; var ongoing;  $.post(     "/api/educationcompletionrates?status=1&startdate=20150701&enddate=20150705",     { data: {} },     function (data) {         completed = data;     } );  $.post(     "/api/educationcompletionrates?status=2&startdate=20150701&enddate=20150705",     { data: {} },     function (data) {         ongoing = data;     } );  var data2 = [     {          value: completed,          color: "#46bfbd",          highlight: "#5ad3d1",          label: "completed"     },     {          value: 700, //ongoing,          color: "#fdb45c",          highlight: "#ffc870",          label: "ongoing"     } ] 

this due ajax requests being asynchronous, not due variable scope. full explanation of issue, see answers in this question. solve problem in specific case, can use $.when calback create data2 object after both ajax calls have completed. try this:

var completed; var ongoing; var requests = [];  requests.push($.post(     "/api/educationcompletionrates?status=1&startdate=20150701&enddate=20150705",     { data: {} },     function (data) {         completed = data;     } ));  requests.push($.post(     "/api/educationcompletionrates?status=2&startdate=20150701&enddate=20150705",     { data: {} },     function (data) {         ongoing = data;     } ));  $.when.apply(this, requests).done(function() {     var data2 = [{          value: completed,          color: "#46bfbd",          highlight: "#5ad3d1",          label: "completed"     },     {          value: ongoing,          color: "#fdb45c",          highlight: "#ffc870",          label: "ongoing"     }];      // add further logic relies on data2 here... }); 

note approach quicker nesting ajax calls run in parallel, rather in chain. therefore user waiting long slowest request.