jQuery callback for multiple ajax calls

Question

I want to make three ajax calls in a click event. Each ajax call does a distinct operation and returns back data that is needed for a final callback. The calls themselves ar

Answer 1

I found an easier way to do it without the need of extra methods that arrange a queue.

JS

$.ajax({
  type: 'POST',
  url: 'ajax1.php',
  data:{
    id: 1,
    cb:'method1'//declaration of callback method of ajax1.php
  },
  success: function(data){
  //catching up values
  var data = JSON.parse(data);
  var cb=data[0].cb;//here whe catching up the callback 'method1'
  eval(cb+"(JSON.stringify(data));");//here we calling method1 and pass all data
  }
});


$.ajax({
  type: 'POST',
  url: 'ajax2.php',
  data:{
    id: 2,
    cb:'method2'//declaration of callback method of ajax2.php
  },
  success: function(data){
  //catching up values
  var data = JSON.parse(data);
  var cb=data[0].cb;//here whe catching up the callback 'method2'
  eval(cb+"(JSON.stringify(data));");//here we calling method2 and pass all data
  }
});


//the callback methods
function method1(data){
//here we have our data from ajax1.php
alert("method1 called with data="+data);
//doing stuff we would only do in method1
//..
}

function method2(data){
//here we have our data from ajax2.php
alert("method2 called with data="+data);
//doing stuff we would only do in method2
//..
}

PHP (ajax1.php)

 $cb,
    "value" => "ajax1"
    );      

    //encoding array in JSON format
    echo json_encode($json);
?>

PHP (ajax2.php)

 $cb,
    "value" => "ajax2"
    );      

    //encoding array in JSON format
    echo json_encode($json);
?>