jappixmini/jappix/js/jxhr.js

   1 // jXHR.js (JSON-P XHR)\r
   2 // v0.1 (c) Kyle Simpson\r
   3 // MIT License\r
   4 // modified by gueron Jonathan to work with strophe lib\r
   5 // for http://www.iadvize.com\r
   6 \r
   7 (function(global){\r
   8         var SETTIMEOUT = global.setTimeout, // for better compression\r
   9                 doc = global.document,\r
  10                 callback_counter = 0;\r
  11                 \r
  12         global.jXHR = function() {\r
  13                 var script_url,\r
  14                         script_loaded,\r
  15                         jsonp_callback,\r
  16                         scriptElem,\r
  17                         publicAPI = null;\r
  18                         \r
  19                 function removeScript() { try { scriptElem.parentNode.removeChild(scriptElem); } catch (err) { } }\r
  20                         \r
  21                 function reset() {\r
  22                         script_loaded = false;\r
  23                         script_url = "";\r
  24                         removeScript();\r
  25                         scriptElem = null;\r
  26                         fireReadyStateChange(0);\r
  27                 }\r
  28                 \r
  29                 function ThrowError(msg) {\r
  30                         try { \r
  31                                 publicAPI.onerror.call(publicAPI,msg,script_url); \r
  32                         } catch (err) { \r
  33                                 //throw new Error(msg); \r
  34                         }\r
  35                 }\r
  36 \r
  37                 function handleScriptLoad() {\r
  38                         if ((this.readyState && this.readyState!=="complete" && this.readyState!=="loaded") || script_loaded) { return; }\r
  39                         this.onload = this.onreadystatechange = null; // prevent memory leak\r
  40                         script_loaded = true;\r
  41                         if (publicAPI.readyState !== 4) ThrowError("handleScriptLoad: Script failed to load ["+script_url+"].");\r
  42                         removeScript();\r
  43                 }\r
  44                 \r
  45                 function parseXMLString(xmlStr) {\r
  46                         var xmlDoc = null;\r
  47                         if(window.DOMParser) {\r
  48                                 var parser = new DOMParser();\r
  49                                 xmlDoc = parser.parseFromString(xmlStr,"text/xml");\r
  50                         }\r
  51                         else {\r
  52                                 xmlDoc = new ActiveXObject("Microsoft.XMLDOM"); \r
  53                                 xmlDoc.async="false";\r
  54                                 xmlDoc.loadXML(xmlStr);\r
  55                         }\r
  56                         return xmlDoc;\r
  57                 }\r
  58                 \r
  59                 function fireReadyStateChange(rs,args) {\r
  60                 \r
  61                         args = args || [];\r
  62                         publicAPI.readyState = rs;\r
  63                         if (rs == 4) {\r
  64                                 publicAPI.responseText = args[0].reply;\r
  65                                 publicAPI.responseXML = parseXMLString(args[0].reply);\r
  66                         }\r
  67                         if (typeof publicAPI.onreadystatechange === "function") publicAPI.onreadystatechange.apply(publicAPI,args);\r
  68                 }\r
  69                                 \r
  70                 publicAPI = {\r
  71                         onerror:null,\r
  72                         onreadystatechange:null,\r
  73                         readyState:0,\r
  74                         status:200,\r
  75                         responseBody: null,\r
  76                         responseText: null,\r
  77                         responseXML: null,\r
  78                         open:function(method,url){\r
  79                                 reset();\r
  80                                 var internal_callback = "cb"+(callback_counter++);\r
  81                                 (function(icb){\r
  82                                         global.jXHR[icb] = function() {\r
  83                                                 try { fireReadyStateChange.call(publicAPI,4,arguments); } \r
  84                                                 catch(err) { \r
  85                                                         publicAPI.readyState = -1;\r
  86                                                         ThrowError("Script failed to run ["+script_url+"]."); \r
  87                                                 }\r
  88                                                 global.jXHR[icb] = null;\r
  89                                         };\r
  90                                 })(internal_callback);\r
  91                                 script_url = url + '?callback=?jXHR&data=';\r
  92                                 script_url = script_url.replace(/=\?jXHR/,"=jXHR."+internal_callback);\r
  93                                 fireReadyStateChange(1);\r
  94                         },\r
  95                         send:function(data){\r
  96                                 script_url = script_url + encodeURIComponent(data);\r
  97                                 SETTIMEOUT(function(){\r
  98                                         scriptElem = doc.createElement("script");\r
  99                                         scriptElem.setAttribute("type","text/javascript");\r
 100                                         scriptElem.onload = scriptElem.onreadystatechange = function(){handleScriptLoad.call(scriptElem);};\r
 101                                         scriptElem.setAttribute("src",script_url);\r
 102                                         doc.getElementsByTagName("head")[0].appendChild(scriptElem);\r
 103                                 },0);\r
 104                                 fireReadyStateChange(2);\r
 105                         },\r
 106                         abort:function(){},\r
 107                         setRequestHeader:function(){}, // noop\r
 108                         getResponseHeader:function(){return "";}, // basically noop\r
 109                         getAllResponseHeaders:function(){return [];} // ditto\r
 110                 };\r
 111 \r
 112                 reset();\r
 113                 \r
 114                 return publicAPI;\r
 115         };\r
 116 })(window);\r