cssAudio - Activefile-genericCSS - ActiveGeneric - ActiveHTML - ActiveImage - ActiveJS - ActiveSVG - ActiveText - Activefile-genericVideo - Activehtmlicon-personicon-teamoctocatpop-outspinnerstartv

Pen Settings

CSS Base

Vendor Prefixing

Add External CSS

These stylesheets will be added in this order and before the code you write in the CSS editor. You can also add another Pen here, and it will pull the CSS from it. Try typing "font" or "ribbon" below.

Quick-add: + add another resource

Add External JavaScript

These scripts will run in this order and before the code in the JavaScript editor. You can also link to another Pen here, and it will run the JavaScript from it. Also try typing the name of any popular library.

Quick-add: + add another resource

Code Indentation

     

Save Automatically?

If active, Pens will autosave every 30 seconds after being saved once.

Auto-Updating Preview

If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

            
              <h1>Public Github repos and forks at /jufa</h1>

<h2>using jQuery's promise implementation:</h2>
<ul id = "promos">
</ul>

<h2>same thing but using a standard A+ promise by wrapping with q.js:</h2>
<ul id = "promospromise">
</ul>
            
          
!
            
              body {
  font-family: sans-serif;
}

ul {
  list-style-type: none;
}
            
          
!
            
              "use strict";
/**
 * Promises A+
 * inspired by: 
 * http://joseoncode.com/2013/05/23/promises-a-plus/
*/

var workingWebservice = "https://api.github.com/users/jufa/repos";
var brokenWebservice = "https://api.github.baduri";
var webserviceUnderTest;
webserviceUnderTest = workingWebservice; 
//var webserviceUnderTest = brokenWebservice; 

// so this is how we do it with jQuery callbacks and deferals:
// we use the chainable, clear, but non-standard .done() and .error()
$.ajax(webserviceUnderTest).done(function(data){
  for (var i = 0; i < data.length; i++) {
    $('#promos').append('<li><h3>'+data[i].name+'</h3><p>'+data[i].description+'</p></li>');  
  }
}).error(function(error){
    $('#promos').append('Error: ', error.state());
});

// but we want to be compliant with the Promise A+ standard 
// which is interoperable between many other asynchronous libraries.
// q.js is a popular stand-alone (not part of a bigger framework)
// implementation; we could use it to
// 'wrap'the non standard jQuery asynchronous callback scheme 
// to produce standard promises:

// first, use the Q.defer factory method to make a 'deferral' object.
// A Deferral object is a container for any asynchronous style event 
// that we want to work with using the Promises A+ standard:
var d = Q.defer();
 
// Now we have something that contains:
// a promise object we can pass around using chaining i.e. 
// doSomething.then(doSomethingElse()).then(doAThirdThing());
// a reject method - which is called if something goes wrong in this chain opf promises,
// like an timeout in a webservice call
// a resolve method - which is called when the promise returns with success and data!

//so now we tie the jQuery asynchronous callback functions .done and .error to this
// standard deferral object's reject and resolve methods, so the two together behave to the A+ standard.
// the trick here is to tie in three things:
// 1. Assign the reslt of the nonstandard jQuery asynch function to the standard promise in
//    our new deferal object
// 2. Pass the nonstandard success callback's data to the resolve method
//    our new deferal object
// 3. Pass the nonstandard error callback's data to the reject method
//    our new deferal object:
var ourNewPromise = d.promise; //Step 1 complete!
ourNewPromise = $.ajax(webserviceUnderTest)
  .done(function(data){
    d.resolve(data); //step 2 complete!
  })
  .error(function(error){
    d.reject(error); //step 3 complete!
  });


// and NOW we can handle the asynchronous result using the standard 
// Promise A+ standard notation and patterns, such as .then, intead of .done!
ourNewPromise.then(function(data){
  for (var i = 0; i < data.length; i++) {
    $('#promospromise').append('<li><h3>' + data[i].name + '</h3><p>' + data[i].description + '</p></li>'); 
  }  
}, function(error){
    console.log(error);
    $('#promospromise').append('Error: ', error.state());
});

//is this a big deal? I think it is if you are using many libraries that need to speak the same asynchronous language. The alternative is callback nesting, callbacks, and other design patterns which can make code maintenance a brace and bracket hunt!
            
          
!
999px
Close

Asset uploading is a PRO feature.

As a PRO member, you can drag-and-drop upload files here to use as resources. Images, Libraries, JSON data... anything you want. You can even edit them anytime, like any other code on CodePen.

Go PRO

Loading ..................

Console