How to call a function within the same module?

问题

I'm trying to get my head round RequireJS in order to tidy up my app.

I have a few modules, and a main.js script.

In my main.js, I am defining a module that contains a few AJAX functions, to make basic API calls.

Inside this "API" module, I am first calling one of the AJAX functions, which after completion, needs to call a different AJAX function, inside the same "API" module (as these are Async tasks, I thought chaining them like this would be OK?!).

But, just calling the function name within the same module doesn't work.

So how do I call a function within the same module?

Here is how my "API" module is set out:

define(function() {
    return {
        ajaxCall_A: function() {
            $.ajax({
                // settings
            }).done(function() {
                // now call ajaxCall_B
                ajaxCall_B(); // doesn't work!
            });
        },
        ajaxCall_B: function() {
            $.ajax({
                // settings
            }).done(function() {
                // finished
            });
        }
    }
}

回答1:

The following change of adding a reference to the local object to the ajaxCall_A will fix the issue, however you'd probably be better off looking into JQuery promises/deferreds as this is a much nicer way of chaining Ajax calls.

define(function() {
    return {
        ajaxCall_A: function() {
            var self = this;
            $.ajax({
                // settings
            }).done(function() {
                // now call ajaxCall_B
                self.ajaxCall_B(); // doesn't work!
            });
        },
        ajaxCall_B: function() {
            $.ajax({
                // settings
            }).done(function() {
                // finished
            });
        }
    }
}

Brief example using promises (untested):

define(function() {
        return {
            ajaxCall: function() {
                $.when(this.ajaxCall_A())
                 .then(this.ajaxCall_B())
                 .done(function() {
                    // finished
                 });
            },
            ajaxCall_A: function() {
                return $.ajax({
                    // settings
                });
            },
            ajaxCall_B: function() {
                return $.ajax({
                    // settings
                })
            }
        }
    }

回答2:

    (function (define) {
    return {
        ajaxCall_A: function () {
            $.ajax({
                // settings
            }).done(function () {
                // now call ajaxCall_B
                define.ajaxCall_B(); // it works now!
            });
        },
        ajaxCall_B: function () {
            $.ajax({
                // settings
            }).done(function () {
                // finished
            });
        }
    }
});

Try using like this.

来源：https://stackoverflow.com/questions/33390448/how-to-call-a-function-within-the-same-module

标签

javascript

jquery

ajax

requirejs