load json into variable

Question

I have to do something very simple  but there doesn t seem to be an easy way to do this  as far as I can tell  I just want to load JSON data from a remote source and store it in a global Javascript variable using jQuery  Here s what I have   var my json    getJSON my url  function json      var my json   json        The my json variable remains undefined  I think this is clearly a scope issue  It seems to me the   getJSON method should return JSON  but it returns an XMLHttpRequest object  If I do this   request     getJSON my url   my json   request responseText evalJSON      That doesn t work because until the readystate    4  the responsetext remains null  It seems you have to use the callback function to return the responsetext  since it fires on success   It can t be this hard  Right

User · Answer

lt input  class  pull-right  id  currSpecID  name  currSpecID  value    gt        get  http   localhost 8080 HIS API rest MriSpecimen getMaxSpecimenID   function data  status          alert  Data      data     nStatus      status           currSpecID   val data

User · Answer

This will do it   var json    function          var json   null        ajax            async   false           global   false           url   my url           dataType    json            success   function  data                json   data                        return json           The main issue being that   getJSON will run asynchronously  thus your Javascript will progress past the expression which invokes it even before its success callback fires  so there are no guarantees that your variable will capture any data   Note in particular the  async   false option in the above ajax call  The manual says      By default  all requests are sent   asynchronous  i e  this is set to true   by default   If you need synchronous   requests  set this option to false    Note that synchronous requests may   temporarily lock the browser    disabling any actions while the   request is active

User · Answer

this will get JSON file externally to your javascript variable  now this sample data will contain the values of JSON file      var sample data         getJSON  sample json   function  data        sample data   data        each data  function  key  value            console log sample data

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x000D   x000D  var itens   null  x000D    getJSON  yourfile json   function data    x000D    itens   data  x000D    itens forEach function item    x000D      console log item   x000D        x000D      x000D  console log itens   x000D   lt html gt  x000D   lt head gt  x000D   lt script type  text javascript  src  http   code jquery com jquery-1 7 2 min js  gt  lt  script gt  x000D   lt  head gt  x000D   lt body gt  x000D   lt  body gt  x000D   lt  html gt  x000D   x000D   x000D

User · Answer

code bit should read   var my json    getJSON my url  function json      my json   json

[jquery] load json into variable

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