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Jquery Deferred objects and Promises


jQuery promises are a clever way of chaining together asynchronous operations in a building-block manner. This replaces old-school nesting of callbacks, which are not so easily reorganised.

jQuery ajax() success, error VS .done(), .fail()


success and Error : A success callback that gets invoked upon successful completion of an Ajax request.
A failure callback that gets invoked in case there is any error while making the request.

Example:

$.ajax({
 url: 'URL',
 type: 'POST',
 data: yourData,
 datatype: 'json',
 success: function (data) { successFunction(data); },
 error: function (jqXHR, textStatus, errorThrown) { errorFunction(); }
 });

.done() and .fail() :
.ajax().done(function(data, textStatus, jqXHR){}); Replaces method .success() which was deprecated in jQuery 1.8.This is an alternative construct for the success callback function above.

.ajax().fail(function(jqXHR, textStatus, errorThrown){}); Replaces method .error() which was deprecated in jQuery 1.8.This is an alternative construct for the complete callback function above.

Example:

$.ajax({
 url: 'URL',
 type: 'POST',
 data: yourData,
 datatype: 'json'
})
.done(function (data) { successFunction(data); })
.fail(function (jqXHR, textStatus, errorThrown) { serrorFunction(); });


Conclusion

In this page (written and validated by ) you learned about Jquery Deferred objects and Promises . What's Next? If you are interested in completing Jquery tutorial, your next topic will be learning about: Jquery Basic promise creation.



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