November 2012
Intermediate to advanced
106 pages
2h 20m
English
We started this chapter by showing how the Ajax methods in jQuery 1.5+ ($.ajax, $.get, and $.post) return Promises. But to really understand Promises, we need to make a few of our own.
Let’s give the user a prompt to hit either Y or N. The first thing we’ll do is create an instance of $.Deferred that represents the user’s decision.
| | var promptDeferred = new $.Deferred(); |
| | promptDeferred.always(function(){ console.log('A choice was made:'); }); |
| | promptDeferred.done(function(){ console.log('Starting game...'); }); |
| | promptDeferred.fail(function(){ console.log('No game today.'); }); |
(Note: always is available only in jQuery 1.6+.)
You’re probably wondering why I created an instance of Deferred when this section ...