how to get variable alert(test) from var test in success ajax

Question

$.ajax({    
     type: "post",
     dataType:"json",
     url: "json.php",
     success: function(a) {
        var test = a.data[0]['id'];
     }
   });

alert(test); //not working

what exactly value does it alert eg undefined or anything else — Aatif Bandey, Sep 14 '16 at 07:30
http://stackoverflow.com/questions/14220321/how-do-i-return-the-response-from-an-asynchronous-call — naortor, Sep 14 '16 at 07:31

score 0 · Answer 1 · answered Sep 14 '16 at 07:33

0

The variable test is not global defined it won't alert the value. try this

 var test;
 $.ajax({    
   type: "post",
   dataType:"json",
   url: "json.php",
   success: function(a) {
     test = a.data[0]['id'];
   }
 });

 alert(test);

answered Sep 14 '16 at 07:33

Aatif Bandey

1,193
11
14

Also it's asynchronous call it may alert `undefined` because java-script will make an ajax call and move to next statement. – Aatif Bandey Sep 14 '16 at 07:39

score 0 · Answer 2 · answered Sep 14 '16 at 07:56

Your var test is not global, but also ajax is asynchronous called , it will alert test to undefined even if you used global variable as alert will first execute while ajax is waiting from server response ... so used like below

function test(a) { alert(a); }
$.ajax({    
     type: "post",
     dataType:"json",
     url: "json.php",
     success: test
   });

how to get variable alert(test) from var test in success ajax

2 Answers2