jQuery ajax handling continue responses success vs done

Question

I have been working with jQuery and AJAX for a few weeks now and I saw two different ways to  continue  the script once the call has been made  success  and  done  From the synopsis from the jQuery documentation we get    done    Description  Add handlers to be called when the Deferred object is resolved  success    ajax   option   A function to be called if the request succeeds   So  both do something after the AJAX call has been completed resolved  Can I use one or the other randomly  What is the difference and when one is used instead of the other

User · Answer

If you need async  false in your ajax  you should use success instead of  done  Else you better to use  done  This is from jQuery official site      As of jQuery 1 8  the use of async  false with jqXHR    Deferred  is deprecated  you must use the success error complete callback options instead of the corresponding methods of the jqXHR object such as jqXHR done

User · Answer

success has been the traditional name of the success callback in jQuery  defined as an option in the ajax call  However  since the implementation of   Deferreds and more sophisticated callbacks  done is the preferred way to implement success callbacks  as it can be called on any deferred   For example  success     ajax     url         success  function data           For example  done     ajax  url        done function data         The nice thing about done is that the return value of   ajax is now a deferred promise that can be bound to anywhere else in your application  So let s say you want to make this ajax call from a few different places  Rather than passing in your success function as an option to the function that makes this ajax call  you can just have the function return   ajax itself and bind your callbacks with done  fail  then  or whatever  Note that always is a callback that will run whether the request succeeds or fails  done will only be triggered on success   For example   function xhr get url       return   ajax       url  url      type   get       dataType   json       beforeSend  showLoadingImgFn         always function            remove loading image maybe         fail function            handle request failures           xhr get   index   done function data         do stuff with index data      xhr get   id   done function data         do stuff with id data       An important benefit of this in terms of maintainability is that you ve wrapped your ajax mechanism in an application-specific function  If you decide you need your   ajax call to operate differently in the future  or you use a different ajax method  or you move away from jQuery  you only have to change the xhr get definition  being sure to return a promise or at least a done method  in the case of the example above   All the other references throughout the app can remain the same   There are many more  much cooler  things you can do with   Deferred  one of which is to use pipe to trigger a failure on an error reported by the server  even when the   ajax request itself succeeds  For example   function xhr get url       return   ajax       url  url      type   get       dataType   json          pipe function data        return data responseCode    200           Deferred   reject  data           data          fail function data        if   data responseCode         console log  data responseCode             xhr get   index   done function data         will not run if json returned from ajax has responseCode other than 200       Read more about   Deferred here  http   api jquery com category deferred-object   NOTE  As of jQuery 1 8  pipe has been deprecated in favor of using then in exactly the same way

User · Answer

From JQuery Documentation   The jqXHR objects returned by   ajax   as of jQuery 1 5 implement the Promise interface  giving them all the properties  methods  and behavior of a Promise  see Deferred object for more information   These methods take one or more function arguments that are called when the   ajax   request terminates  This allows you to assign multiple callbacks on a single request  and even to assign callbacks after the request may have completed   If the request is already complete  the callback is fired immediately   Available Promise methods of the jqXHR object include   jqXHR done function  data  textStatus  jqXHR          An alternative construct to the success callback option  refer to deferred done   for implementation details   jqXHR fail function  jqXHR  textStatus  errorThrown          An alternative construct to the error callback option  the  fail   method replaces the deprecated  error   method  Refer to deferred fail   for implementation details   jqXHR always function  data jqXHR  textStatus  jqXHR errorThrown             added in jQuery 1 6  An alternative construct to the complete callback option  the  always   method replaces the deprecated  complete   method   In response to a successful request  the function s arguments are the same as those of  done    data  textStatus  and the jqXHR object  For failed requests the arguments are the same as those of  fail    the jqXHR object  textStatus  and errorThrown  Refer to deferred always   for implementation details   jqXHR then function  data  textStatus  jqXHR       function  jqXHR  textStatus  errorThrown          Incorporates the functionality of the  done   and  fail   methods  allowing  as of jQuery 1 8  the underlying Promise to be manipulated  Refer to deferred then   for implementation details      Deprecation Notice  The jqXHR success    jqXHR error    and jqXHR complete   callbacks are removed as of jQuery 3 0  You can use   jqXHR done    jqXHR fail    and jqXHR always   instead

[ajax] jQuery.ajax handling continue responses: "success:" vs ".done"?

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