Question

I have a script on some getJSON, please help the solution.

$.getJSON('data1_get.php', {dbase: 'file1', param: '0'}, function(data_1) {
  $.getJSON('data2_get.php', {dbase: 'file2', param: '1'}, function(data_2) {
    for (var i=0; i<data_1.length; i++) { // about 4 rows
      for (var k=0; k<data_2.length; k++) { // about 7 rows
        if (data_1[i].type == data_2[k].type) {
          if (data_2[k].switch=="1") { // possible many process
            // check.php needed time about 3 seconds for 1 process
            $.getJSON('check.php', {param: data_2[k].turnOn}, function(data_3) {
              // not work
              if (data.status) {
                alert('working for '+data_2[k].title);\n";
              }
            });
          }
        }
      }
    }
  });
});

my question is : How can i force it to wait and not continue until we get all the call backs from the ajax requests ?

Thanks!

Answer 1

If I understand correctly, you want to execute a callback after a response has been received for each item. In the callback, I would increment a counter after every response is received and check if the counter is the same as the total number of items. If it is, call the final callback. JavaScript is single-threaded, so there are no concurrency issues.