1 /*

     2 

     3 Cross-Browser XMLHttpRequest v1.2

     4 =================================

     5 

     6 Emulate Gecko 'XMLHttpRequest()' functionality in IE and Opera. Opera requires

     7 the Sun Java Runtime Environment <http://www.java.com/>.

     8 

     9 by Andrew Gregory

    10 http://www.scss.com.au/family/andrew/webdesign/xmlhttprequest/

    11 

    12 This work is licensed under the Creative Commons Attribution License. To view a

    13 copy of this license, visit http://creativecommons.org/licenses/by-sa/2.5/ or

    14 send a letter to Creative Commons, 559 Nathan Abbott Way, Stanford, California

    15 94305, USA.

    16 

    17 Attribution: Leave my name and web address in this script intact.

    18 

    19 Not Supported in Opera

    20 ----------------------

    21 * user/password authentication

    22 * responseXML data member

    23 

    24 Not Fully Supported in Opera

    25 ----------------------------

    26 * async requests

    27 * abort()

    28 * getAllResponseHeaders(), getAllResponseHeader(header)

    29 

    30 */

    31 // IE support

    32 if (window.ActiveXObject && !window.XMLHttpRequest) {

    33   window.XMLHttpRequest = function() {

    34     var msxmls = new Array(

    35       'Msxml2.XMLHTTP.5.0',

    36       'Msxml2.XMLHTTP.4.0',

    37       'Msxml2.XMLHTTP.3.0',

    38       'Msxml2.XMLHTTP',

    39       'Microsoft.XMLHTTP');

    40     for (var i = 0; i < msxmls.length; i++) {

    41       try {

    42         return new ActiveXObject(msxmls[i]);

    43       } catch (e) {

    44       }

    45     }

    46     return null;

    47   };

    48 }

    49 // Gecko support

    50 /* ;-) */

    51 // Opera support

    52 if (window.opera && !window.XMLHttpRequest) {

    53   window.XMLHttpRequest = function() {

    54     this.readyState = 0; // 0=uninitialized,1=loading,2=loaded,3=interactive,4=complete

    55     this.status = 0; // HTTP status codes

    56     this.statusText = '';

    57     this._headers = [];

    58     this._aborted = false;

    59     this._async = true;

    60     this._defaultCharset = 'ISO-8859-1';

    61     this._getCharset = function() {

    62       var charset = _defaultCharset;

    63       var contentType = this.getResponseHeader('Content-type').toUpperCase();

    64       val = contentType.indexOf('CHARSET=');

    65       if (val != -1) {

    66         charset = contentType.substring(val);

    67       }

    68       val = charset.indexOf(';');

    69       if (val != -1) {

    70         charset = charset.substring(0, val);

    71       }

    72       val = charset.indexOf(',');

    73       if (val != -1) {

    74         charset = charset.substring(0, val);

    75       }

    76       return charset;

    77     };

    78     this.abort = function() {

    79       this._aborted = true;

    80     };

    81     this.getAllResponseHeaders = function() {

    82       return this.getAllResponseHeader('*');

    83     };

    84     this.getAllResponseHeader = function(header) {

    85       var ret = '';

    86       for (var i = 0; i < this._headers.length; i++) {

    87         if (header == '*' || this._headers[i].h == header) {

    88           ret += this._headers[i].h + ': ' + this._headers[i].v + '\n';

    89         }

    90       }

    91       return ret;

    92     };

    93     this.getResponseHeader = function(header) {

    94       var ret = getAllResponseHeader(header);

    95       var i = ret.indexOf('\n');

    96       if (i != -1) {

    97         ret = ret.substring(0, i);

    98       }

    99       return ret;

   100     };

   101     this.setRequestHeader = function(header, value) {

   102       this._headers[this._headers.length] = {h:header, v:value};

   103     };

   104     this.open = function(method, url, async, user, password) {

   105       this.method = method;

   106       this.url = url;

   107       this._async = true;

   108       this._aborted = false;

   109       this._headers = [];

   110       if (arguments.length >= 3) {

   111         this._async = async;

   112       }

   113       if (arguments.length > 3) {

   114         opera.postError('XMLHttpRequest.open() - user/password not supported');

   115       }

   116       this.readyState = 1;

   117       if (this.onreadystatechange) {

   118         this.onreadystatechange();

   119       }

   120     };

   121     this.send = function(data) {

   122       if (!navigator.javaEnabled()) {

   123         alert("XMLHttpRequest.send() - Java must be installed and enabled.");

   124         return;

   125       }

   126       if (this._async) {

   127         setTimeout(this._sendasync, 0, this, data);

   128         // this is not really asynchronous and won't execute until the current

   129         // execution context ends

   130       } else {

   131         this._sendsync(data);

   132       }

   133     }

   134     this._sendasync = function(req, data) {

   135       if (!req._aborted) {

   136         req._sendsync(data);

   137       }

   138     };

   139     this._sendsync = function(data) {

   140       this.readyState = 2;

   141       if (this.onreadystatechange) {

   142         this.onreadystatechange();

   143       }

   144       // open connection

   145       var url = new java.net.URL(new java.net.URL(window.location.href), this.url);

   146       var conn = url.openConnection();

   147       for (var i = 0; i < this._headers.length; i++) {

   148         conn.setRequestProperty(this._headers[i].h, this._headers[i].v);

   149       }

   150       this._headers = [];

   151       if (this.method == 'POST') {

   152         // POST data

   153         conn.setDoOutput(true);

   154         var wr = new java.io.OutputStreamWriter(conn.getOutputStream(), this._getCharset());

   155         wr.write(data);

   156         wr.flush();

   157         wr.close();

   158       }

   159       // read response headers

   160       // NOTE: the getHeaderField() methods always return nulls for me :(

   161       var gotContentEncoding = false;

   162       var gotContentLength = false;

   163       var gotContentType = false;

   164       var gotDate = false;

   165       var gotExpiration = false;

   166       var gotLastModified = false;

   167       for (var i = 0; ; i++) {

   168         var hdrName = conn.getHeaderFieldKey(i);

   169         var hdrValue = conn.getHeaderField(i);

   170         if (hdrName == null && hdrValue == null) {

   171           break;

   172         }

   173         if (hdrName != null) {

   174           this._headers[this._headers.length] = {h:hdrName, v:hdrValue};

   175           switch (hdrName.toLowerCase()) {

   176             case 'content-encoding': gotContentEncoding = true; break;

   177             case 'content-length'  : gotContentLength   = true; break;

   178             case 'content-type'    : gotContentType     = true; break;

   179             case 'date'            : gotDate            = true; break;

   180             case 'expires'         : gotExpiration      = true; break;

   181             case 'last-modified'   : gotLastModified    = true; break;

   182           }

   183         }

   184       }

   185       // try to fill in any missing header information

   186       var val;

   187       val = conn.getContentEncoding();

   188       if (val != null && !gotContentEncoding) this._headers[this._headers.length] = {h:'Content-encoding', v:val};

   189       val = conn.getContentLength();

   190       if (val != -1 && !gotContentLength) this._headers[this._headers.length] = {h:'Content-length', v:val};

   191       val = conn.getContentType();

   192       if (val != null && !gotContentType) this._headers[this._headers.length] = {h:'Content-type', v:val};

   193       val = conn.getDate();

   194       if (val != 0 && !gotDate) this._headers[this._headers.length] = {h:'Date', v:(new Date(val)).toUTCString()};

   195       val = conn.getExpiration();

   196       if (val != 0 && !gotExpiration) this._headers[this._headers.length] = {h:'Expires', v:(new Date(val)).toUTCString()};

   197       val = conn.getLastModified();

   198       if (val != 0 && !gotLastModified) this._headers[this._headers.length] = {h:'Last-modified', v:(new Date(val)).toUTCString()};

   199       // read response data

   200       var reqdata = '';

   201       var stream = conn.getInputStream();

   202       if (stream) {

   203         var reader = new java.io.BufferedReader(new java.io.InputStreamReader(stream, this._getCharset()));

   204         var line;

   205         while ((line = reader.readLine()) != null) {

   206           if (this.readyState == 2) {

   207             this.readyState = 3;

   208             if (this.onreadystatechange) {

   209               this.onreadystatechange();

   210             }

   211           }

   212           reqdata += line + '\n';

   213         }

   214         reader.close();

   215         this.status = 200;

   216         this.statusText = 'OK';

   217         this.responseText = reqdata;

   218         this.readyState = 4;

   219         if (this.onreadystatechange) {

   220           this.onreadystatechange();

   221         }

   222         if (this.onload) {

   223           this.onload();

   224         }

   225       } else {

   226         // error

   227         this.status = 404;

   228         this.statusText = 'Not Found';

   229         this.responseText = '';

   230         this.readyState = 4;

   231         if (this.onreadystatechange) {

   232           this.onreadystatechange();

   233         }

   234         if (this.onerror) {

   235           this.onerror();

   236         }

   237       }

   238     };

   239   };

   240 }

   241 // ActiveXObject emulation

   242 if (!window.ActiveXObject && window.XMLHttpRequest) {

   243   window.ActiveXObject = function(type) {

   244     switch (type.toLowerCase()) {

   245       case 'microsoft.xmlhttp':

   246       case 'msxml2.xmlhttp':

   247       case 'msxml2.xmlhttp.3.0':

   248       case 'msxml2.xmlhttp.4.0':

   249       case 'msxml2.xmlhttp.5.0':

   250         return new XMLHttpRequest();

   251     }

   252     return null;

   253   };

   254 }