ajax return true/false - I have implemented a callback [duplicate]

Answer 1

Your function validateUserDetails return no value, she just execute an asynchronous function. The asynchronous function return true or false, but nothing for catching it.

It's like this :

function validateUserDetails(){

    // asynchronous function
    $.ajax({...});

    return undefined;
}

If you try console.log(trueOrFalse(bool)); you will see "true" or "false", but you can't use "return" into asynchronous function. You must do something into success function, who use "data" (log, or another function)

Answer 2

As noone has answered yet, I will:

First of all, you can try sync request

function validateUserDetails() {
    var bool = false;

    $.ajax({
            url: 'response.php?type=validateUserDetails',
            type: 'POST',
            async: false,
            dataType: 'json',
            data: {name: $("#checkout_name").val(), email: $("#checkout_email").val(), "country": $("#checkout_country").val(), "city": $("#checkout_city").val()},
            success: function(data) {
                console.log(data);  // this is currently returning FALSE
                                    // Which is totally correct!
                if (data == true) {
                    bool = true;
                }
            }
    });

    return trueOrFalse(bool);
}

If it is not acceptable, you can use $.Deferred()

function validateUserDetails() {
   var deferred = $.Deferred();
   var bool = false;

   $.ajax({
      url: 'response.php?type=validateUserDetails',
      type: 'POST',
      dataType: 'json',
      data: {name: $("#checkout_name").val(), email: $("#checkout_email").val(), "country": $("#checkout_country").val(), "city": $("#checkout_city").val()},
      success: function(data) {
      console.log(data);  // this is currently returning FALSE
                                            // Which is totally correct!
            if (data == true) {
                            bool = true;
                        }
                    }
      complete: function () {
                        deferred.resolve(trueOrFalse(bool));
                    }
      });

   return deferred.promise();
}

function trueOrFalse(bool){
        return bool;
}

function test() {
   var promise = validateUserDetails();
   promise.done(function(result) {
        console.log("Bool: " + result);
   });
}

Answer 3

ajax request is asynchronous. Don't use the sync: true option, it's not really a good idea. What you can do is to use the promise that the ajax returns, so:

function validateUserDetails(){

return $.ajax({
    url: 'response.php?type=validateUserDetails',
    type: 'POST',
    async: false,
    dataType: 'json',
    data: {name: $("#checkout_name").val(), email: $("#checkout_email").val(), "country": $("#checkout_country").val(), 
           "city": $("#checkout_city").val()},
    success: function(data){
        console.log(data); // this is currently returning FALSE
    }
  });
}
$("#btn_go").on('click', function(){
    validateUserDetails().done(function(data){
         if(data == "someValue")
            return "whatever you want";
    });
});