javascript - How to to return a value from Ajax call to server -


this question has answer here:

i make ajax call server retrieve records , return them json object. here code call

$(".reply").click(function (){        $.ajax({     url: "/ajax_up/",     type: 'get',     datatype: "json",     success: function (data) {     sync_data=json.stringify(data)      }  });

am trying use returned data construct grid, when pass variable syncd_data have declared global in ajax call, seems undefined.

$(document).ready(function(){         var data = source_data;   //other code         ..........................         ..........................

but when alert(sync_data) within ajax call below:

$(".reply").click(function (){            $.ajax({         url: "/ajax_up/",         type: 'get',         datatype: "json",         success: function (data) {         sync_data=json.stringify(data)          }      });

it shows data correctly. can use data outside ajax call? insights or examples highly appreciated. thanks

you need make sure calling function inside of success callback of ajax call:

success: function (data) {     sync_data=json.stringify(data);     dosomething(sync_data);         }

this because ajax asynchronous, need make sure call done , successful before proceeding next event. if variable declared global.

update:

    var sync_data;      $(document).ready(function(){      $.ajax({             url: "/ajax_up/",             type: 'get',             datatype: "json",             success: function (data) {                  sync_data=json.stringify(data);                    }          });           });

this way, you'll make sure sync_data is, technically, populated in document.ready upon returning ajax request. can consume anywhere.


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