JavaScript & jQuery: Calling inner functions

Question

I have the following code in JavaScript and jQuery with an integrated ajax request. Question: Why is it possible to call the inner function success1() but it is not possible to call this.success2() ? Any solution proposals for this problem?

function myfuntion() {
    this.url = "www.example.com/ajax.php";
    var success1 = function (data) {
        alert("SUCCESS1");
    }
    this.success2 = function (data) {
        alert("SUCCESS2");
    }
    this.send = function () {
        $.ajax({
            type: "POST",
            url: this.url,
            dataType: "html"
        }).done(function (data) {
            success1(data);
            this.success2(data);
        });
    }
}
var test = new myfunction().send();

Because inside the callback, `this` refers to another object. — Felix Kling, Apr 06 '13 at 11:13
You may want to take a look at the accepted answer for http://stackoverflow.com/questions/3127429/javascript-this-keyword for an excellent explanation of JavaScript's 'this' — frostmatthew, Apr 06 '13 at 13:44

Gaurav · Answer 1 · 2013-04-08T03:15:33.247

As other commented, the context of this inside the send function is changed, so that's why your success2 function is not calling. You should save myFunction context in a variable and use that variable to refer this context.

Try this:

function myfuntion() {
    var self = this;                // taking the current context in a variable.

    self.url = "www.example.com/ajax.php";
    var success1 = function (data) {
        alert("SUCCESS1");
    }
    self.success2 = function (data) {
        alert("SUCCESS2");
    }
    self.send = function () {
        $.ajax({
            type: "POST",
            url: self.url,
            dataType: "html"
        }).done(function (data) {
            success1(data);
            self.success2(data);
        });
    }
}

JavaScript & jQuery: Calling inner functions

1 Answers1