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Access Control Allow Origin simulation for IE8 and IE9

/ Published in: JavaScript
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Usage:










https://goodguys.com
You should never see this



than just postMessage to an iframe with this HTML + JS, and wait for the reply. iframe will do request for you

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Copy this code and paste it in your HTML 
  1. function checkOrigin(origin) {
  2.     var allows = $('.allow-origin');
  3.     for (var i = 0; i < allows.length; i++) {
  4.         var allow = $(allows[i]).text();
  5.         if (allow == "*")
  6.             return true;
  7.         if (allow == origin)
  8.             return true;
  9.     }
  10.     return false;
  11. }
  12.  
  13. function messageHandler(e) {
  14.     var origin = e.originalEvent.origin;
  15.     if (!checkOrigin(origin))
  16.         return;
  17.  
  18.     var request = JSON.parse(e.originalEvent.data);
  19.  
  20.     // TODO remove this IF after testing
  21.     if (origin == "file:" || origin == "null")
  22.         origin = "*";
  23.  
  24.     $.ajax(request.ajax)
  25.         .done(function (data) {
  26.             request.result = data;
  27.             var reply = JSON.stringify(request);
  28.             parent.postMessage(reply, origin);
  29.         })
  30.         .fail(function (req) {
  31.             request.error = req.statusText;
  32.             request.errorCode = req.status;
  33.             var reply = JSON.stringify(request);
  34.             parent.postMessage(reply, origin);
  35.         });
  36. }
  37.  
  38. $(document).on('ready', function () {
  39.     $(window).on('message', messageHandler);
  40. });

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