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comparison geotemco/lib/simile/ajax/scripts/xmlhttp.js @ 0:b12c99b7c3f0

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commit for previous development
author Zoe Hong <zhong@mpiwg-berlin.mpg.de>
date Mon, 19 Jan 2015 17:13:49 +0100
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-1:000000000000 0:b12c99b7c3f0
1 /**
2 * @fileOverview XmlHttp utility functions
3 * @name SimileAjax.XmlHttp
4 */
5
6 SimileAjax.XmlHttp = new Object();
7
8 /**
9 * Callback for XMLHttp onRequestStateChange.
10 */
11 SimileAjax.XmlHttp._onReadyStateChange = function(xmlhttp, fError, fDone) {
12 switch (xmlhttp.readyState) {
13 // 1: Request not yet made
14 // 2: Contact established with server but nothing downloaded yet
15 // 3: Called multiple while downloading in progress
16
17 // Download complete
18 case 4:
19 try {
20 if (xmlhttp.status == 0 // file:// urls, works on Firefox
21 || xmlhttp.status == 200 // http:// urls
22 ) {
23 if (fDone) {
24 fDone(xmlhttp);
25 }
26 } else {
27 if (fError) {
28 fError(
29 xmlhttp.statusText,
30 xmlhttp.status,
31 xmlhttp
32 );
33 }
34 }
35 } catch (e) {
36 SimileAjax.Debug.exception("XmlHttp: Error handling onReadyStateChange", e);
37 }
38 break;
39 }
40 };
41
42 /**
43 * Creates an XMLHttpRequest object. On the first run, this
44 * function creates a platform-specific function for
45 * instantiating an XMLHttpRequest object and then replaces
46 * itself with that function.
47 */
48 SimileAjax.XmlHttp._createRequest = function() {
49 if (SimileAjax.Platform.browser.isIE) {
50 var programIDs = [
51 "Msxml2.XMLHTTP",
52 "Microsoft.XMLHTTP",
53 "Msxml2.XMLHTTP.4.0"
54 ];
55 for (var i = 0; i < programIDs.length; i++) {
56 try {
57 var programID = programIDs[i];
58 var f = function() {
59 return new ActiveXObject(programID);
60 };
61 var o = f();
62
63 // We are replacing the SimileAjax._createXmlHttpRequest
64 // function with this inner function as we've
65 // found out that it works. This is so that we
66 // don't have to do all the testing over again
67 // on subsequent calls.
68 SimileAjax.XmlHttp._createRequest = f;
69
70 return o;
71 } catch (e) {
72 // silent
73 }
74 }
75 // fall through to try new XMLHttpRequest();
76 }
77
78 try {
79 var f = function() {
80 return new XMLHttpRequest();
81 };
82 var o = f();
83
84 // We are replacing the SimileAjax._createXmlHttpRequest
85 // function with this inner function as we've
86 // found out that it works. This is so that we
87 // don't have to do all the testing over again
88 // on subsequent calls.
89 SimileAjax.XmlHttp._createRequest = f;
90
91 return o;
92 } catch (e) {
93 throw new Error("Failed to create an XMLHttpRequest object");
94 }
95 };
96
97 /**
98 * Performs an asynchronous HTTP GET.
99 *
100 * @param {Function} fError a function of the form
101 function(statusText, statusCode, xmlhttp)
102 * @param {Function} fDone a function of the form function(xmlhttp)
103 */
104 SimileAjax.XmlHttp.get = function(url, fError, fDone) {
105 var xmlhttp = SimileAjax.XmlHttp._createRequest();
106
107 xmlhttp.open("GET", url, true);
108 xmlhttp.onreadystatechange = function() {
109 SimileAjax.XmlHttp._onReadyStateChange(xmlhttp, fError, fDone);
110 };
111 xmlhttp.send(null);
112 };
113
114 /**
115 * Performs an asynchronous HTTP POST.
116 *
117 * @param {Function} fError a function of the form
118 function(statusText, statusCode, xmlhttp)
119 * @param {Function} fDone a function of the form function(xmlhttp)
120 */
121 SimileAjax.XmlHttp.post = function(url, body, fError, fDone) {
122 var xmlhttp = SimileAjax.XmlHttp._createRequest();
123
124 xmlhttp.open("POST", url, true);
125 xmlhttp.onreadystatechange = function() {
126 SimileAjax.XmlHttp._onReadyStateChange(xmlhttp, fError, fDone);
127 };
128 xmlhttp.send(body);
129 };
130
131 SimileAjax.XmlHttp._forceXML = function(xmlhttp) {
132 try {
133 xmlhttp.overrideMimeType("text/xml");
134 } catch (e) {
135 xmlhttp.setrequestheader("Content-Type", "text/xml");
136 }
137 };