Callback function for JSONP with jQuery AJAX

Question

I didn t quite understand how to work with the callback for the ajax function of jQuery   I have the following code in the JavaScript   try         ajax           url   http   url of my server submit callback             cache  false          type   POST           data      survey   serialize            dataType   jsonp           timeout  200          crossDomain  true          jsonp   jsonp callback           success  function  data  status                mySurvey closePopup                       error  function  xOptions  textStatus                mySurvey closePopup                        catch  err        mySurvey closePopup        And on the server side  AppEngine   Python  I get the value of the callback parameter and respond with  self response headers  Content-Type      application json  charset utf-8  self response out write callback       msg    ok         But then I get an  Error  jQuery152042227689944248825 1317400799214 is not a function  in the browser console   What is the proper way to handle this  Right now I get the results that I need  but the fact that I know it s not right is bothering me

User · Answer

delete this line   jsonp   jsonp callback     Or replace this line   url   http   url of my server submit callback json callback     because currently you are asking jQuery to create a random callback function name with callback   and then telling jQuery that you want to use jsonp callback instead

User · Answer

This is what I do on mine    document  ready function       if      userForm   valid          var formData       userForm   serializeArray          ajax         url   http   www example com user         Id   val       callback           type   GET         data  formData        dataType   jsonp         jsonpCallback   localJsonpCallback                 function localJsonpCallback json      if   json Error            resultForm   submit        else           loading   hide            userForm   show        alert json Message

User · Answer

ajax           url   http   url of my server submit           dataType   jsonp           jsonp   callback           jsonpCallback   jsonp callback            jsonp is the querystring parameter name that is defined to be acceptable by the server while the jsonpCallback is the javascript function name to be executed at the client  When you use such url   url   http   url of my server submit callback      the question mark   at the end instructs jQuery to generate a random function while the predfined behavior of the autogenerated function will just invoke the callback -the sucess function in this case- passing the json data as a parameter     ajax           url   http   url of my server submit callback             success  function  data  status                mySurvey closePopup                       error  function  xOptions  textStatus                mySurvey closePopup                         The same goes here if you are using   getJSON with   placeholder it will generate a random function while the predfined behavior of the autogenerated function will just invoke the callback     getJSON  http   url of my server submit callback    function data     process data here

[javascript] Callback function for JSONP with jQuery AJAX

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