jQuery ajax success callback function definition

Question

I want to use jQuery ajax to retrieve data from a server   I want to put the success callback function definition outside the  ajax   block like the following  So do I need to declare the variable dataFromServer like the following so that I will be able to use the returned data from the success callback   I ve seen most people define the success callback inside the  ajax   block  So is the following code correct if I want to define the success callback outside   var dataFromServer     declare the variable first  function getData           ajax           url    example com           type   GET           success   handleData dataFromServer            function handleData data        alert data         do some stuff

User · Answer

after few hours play with it and nearly become dull  miracle came to me  it work    lt pre gt    var listname               ajax       url   wedding     change to your local url  this not work with absolute url     success  function  data           callback data              function callback data            data  find  a   attr  href   function  i  val                if  val match     jpe g png gif                                displayImage1   append    lt img src      wedding   val     gt                       listname push val                                 function myfunction      alert  listname        lt  pre gt

User · Answer

Try rewriting your success handler to   success   handleData   The success property of the ajax method only requires a reference to a function   In your handleData function you can take up to 3 parameters   object data string textStatus jqXHR jqXHR

User · Answer

You don t need to declare the variable  Ajax success function automatically takes up to 3 parameters  Function  Object data  String textStatus  jqXHR jqXHR

User · Answer

Just use   function getData           ajax           url    example com           type   GET           success   handleData            The success property requires only a reference to a function  and passes the data as parameter to this function    You can access your handleData function like this because of the way handleData is declared  JavaScript will parse your code for function declarations before running it  so you ll be able to use the function in code that s before the actual declaration   This is known as hoisting   This doesn t count for functions declared like this  though   var myfunction   function       Those are only available when the interpreter passed them   See this question for more information about the 2 ways of declaring functions

User · Answer

The  new  way of doing this since jQuery 1 5  Jan 2011  is to use deferred objects instead of passing a success callback   You should return the result of   ajax and then use the  done   fail etc methods to add the callbacks outside of the   ajax call   function getData         return   ajax           url    example com           type   GET             function handleData data      textStatus  jqXHR            alert data         do some stuff    getData   done handleData     This decouples the callback handling from the AJAX handling  allows you to add multiple callbacks  failure callbacks  etc  all without ever needing to modify the original getData   function   Separating the AJAX functionality from the set of actions to be completed afterwards is a good thing    Deferreds also allow for much easier synchronisation of multiple asynchronous events  which you can t easily do just with success   For example  I could add multiple callbacks  an error handler  and wait for a timer to elapse before continuing      a trivial timer  just for demo purposes -    it resolves itself after 5 seconds var timer     Deferred    setTimeout timer resolve  5000       add a done handler  and  an  error   handler  even though  getData     didn t directly expose that functionality var ajax   getData   done handleData  fail error      when timer  ajax  done function            this won t be called until  both  the AJAX and the 5s timer have finished      ajax done function data           you can add additional callbacks too  even if the AJAX call        already finished       Other parts of jQuery use deferred objects too - you can synchronise jQuery animations with other async operations very easily with them

User · Answer

I do not know why you are defining the parameter outside the script  That is unnecessary  Your callback function will be called with the return data as a parameter automatically  It is very possible to define your callback outside the sucess  i e   function getData           ajax           url    example com           type   GET           success   handleData           function handleData data        alert data         do some stuff     the handleData function will be called and the parameter passed to it by the ajax function

User · Answer

I would write    var handleData   function  data        alert data         do some stuff     function getData           ajax           url    example com           type   GET           success   handleData

User · Answer

In your component i e angular JS code   function getData        window location href    http   localhost 1036 api Employee GetExcelData

[javascript] jQuery ajax success callback function definition

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