javascript - Do some ajax and return a promise using getJSON - Stack Overflow

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I was using this code to get data from facebook api and to be shown using Durandal, and it is working fine.

   return $.ajax({
        url: '=?',
        dataType: 'json',
    }).promise();

I was trying to do the same using getJSON

$.getJSON( "=?");

I tried the following code; it didn't work.

 var jqxhr = $.getJSON("=?");
 return jqxhr;

This gets me the data from the facebook.

But the issue is in returning the promise. Since I'm using durandal it is important to return a promise for the module to work.

How to return a promise while we use getJSON?

This my durandal module

define(function (require) {
    return {
        getCustomers: function () {
            //do some ajax and return a promise
            var jqxhr = $.getJSON("=?");
            return jqxhr;
        }
    };
});

This is where I call it

define(function (require) {
    var backend = require('backend');
    var ko = require('knockout');

    return {
        customers: ko.observableArray([]),
        activate: function () {
            var that = this;
            return backend.getCustomers().then(function (result) {
                var arr = [];
                arr.push(result)
                that.customers(arr);
            });
        }
    };
});

I was using this code to get data from facebook api and to be shown using Durandal, and it is working fine.

   return $.ajax({
        url: 'http://graph.facebook./facebook?callback=?',
        dataType: 'json',
    }).promise();

I was trying to do the same using getJSON

$.getJSON( "http://graph.facebook./facebook?callback=?");

I tried the following code; it didn't work.

 var jqxhr = $.getJSON("http://graph.facebook./facebook?callback=?");
 return jqxhr;

This gets me the data from the facebook.

But the issue is in returning the promise. Since I'm using durandal it is important to return a promise for the module to work.

How to return a promise while we use getJSON?

This my durandal module

define(function (require) {
    return {
        getCustomers: function () {
            //do some ajax and return a promise
            var jqxhr = $.getJSON("http://graph.facebook./facebook?callback=?");
            return jqxhr;
        }
    };
});

This is where I call it

define(function (require) {
    var backend = require('backend');
    var ko = require('knockout');

    return {
        customers: ko.observableArray([]),
        activate: function () {
            var that = this;
            return backend.getCustomers().then(function (result) {
                var arr = [];
                arr.push(result)
                that.customers(arr);
            });
        }
    };
});

• javascript
• jquery
• ajax
• getjson
• promise

Share Improve this question Follow edited Nov 5, 2013 at 6:27 Okky asked Nov 5, 2013 at 6:21 OkkyOkky 10.5k1515 gold badges7777 silver badges123123 bronze badges

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3 Answers 3

Sorted by: Reset to default 3

This should work

$.getJSON( "http://graph.facebook./facebook?callback=?").promise();

it's already with promise interface : "This jQuery XHR object, or "jqXHR," returned by $.getJSON() implements the Promise interface"

Look here at the example :

var a=$.getJSON( "http://graph.facebook./facebook?callback=?");

a.done(function (){...}).fail(function (){...}).always(function (){...});;

ps

"This gets me the data from the facebook."

NO. this returns jqXHR object.

This has done the trick. Thank you guys

return $.getJSON( "http://graph.facebook./facebook?callback=?").done();

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