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 }
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