Posted on 2007-06-01 16:30
姜海龙 阅读(2355)
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在我的项目中，系统要支持多语言环境，所以采用utf-8编码格式，系统菜单是通过一个action返回一个xml获得菜单数据进行加载的。
最初js脚本中采用如下方式进行加载：
1
var xmlDoc = new ActiveXObject("MSXML.DOMDocument");
2xmlDoc.async = false;
3xmlDoc.load("sysMemo.do");
结果返回的xml中文全是乱码，一直搞不明白是什么原因，该设置的地方也全部设置了。最后通过使用WebFx的一个js类通过xmlhttp的方式解决了这个问题。
下面这段代码是WebFx的xmlextras.js中的代码：
1
function getDomDocumentPrefix() 
{
2
if (getDomDocumentPrefix.prefix)
3 return getDomDocumentPrefix.prefix;
4
5 var prefixes = ["MSXML2", "Microsoft", "MSXML", "MSXML3"];
6 var o;
7
for (var i = 0; i < prefixes.length; i++) {
8 try {
9 // try to create the objects
10 o = new ActiveXObject(prefixes[i] + ".DomDocument");
11 return getDomDocumentPrefix.prefix = prefixes[i];
12
}
13 catch (ex) {};
14 }
15
16 throw new Error("Could not find an installed XML parser");
17
}
18
19 function getXmlHttpPrefix() {
20 if (getXmlHttpPrefix.prefix)
21 return getXmlHttpPrefix.prefix;
22
23 var prefixes = ["MSXML2", "Microsoft", "MSXML", "MSXML3"];
24 var o;
25 for (var i = 0; i < prefixes.length; i++) {
26 try {
27 // try to create the objects
28 o = new ActiveXObject(prefixes[i] + ".XmlHttp");
29 return getXmlHttpPrefix.prefix = prefixes[i];
30 }
31 catch (ex) {};
32 }
33
34 throw new Error("Could not find an installed XML parser");
35 }
36
37 //////////////////////////
38 // Start the Real stuff //
39 //////////////////////////
40
41
42 // XmlHttp factory
43 function XmlHttp() {}
44
45 XmlHttp.create = function () {
46 try {
47 if (window.XMLHttpRequest) {
48 var req = new XMLHttpRequest();
49
50 // some versions of Moz do not support the readyState property
51 // and the onreadystate event so we patch it!
52 if (req.readyState == null) {
53 req.readyState = 1;
54 req.addEventListener("load", function () {
55 req.readyState = 4;
56 if (typeof req.onreadystatechange == "function")
57 req.onreadystatechange();
58 }, false);
59 }
60
61 return req;
62 }
63 if (window.ActiveXObject) {
64 return new ActiveXObject(getXmlHttpPrefix() + ".XmlHttp");
65 }
66 }
67 catch (ex) {}
68 // fell through
69 throw new Error("Your browser does not support XmlHttp objects");
70 };
71
72 // XmlDocument factory
73 function XmlDocument() {}
74
75 XmlDocument.create = function () {
76 try {
77 // DOM2
78 if (document.implementation && document.implementation.createDocument) {
79 var doc = document.implementation.createDocument("", "", null);
80
81 // some versions of Moz do not support the readyState property
82 // and the onreadystate event so we patch it!
83 if (doc.readyState == null) {
84 doc.readyState = 1;
85 doc.addEventListener("load", function () {
86 doc.readyState = 4;
87 if (typeof doc.onreadystatechange == "function")
88 doc.onreadystatechange();
89 }, false);
90 }
91
92 return doc;
93 }
94 if (window.ActiveXObject)
95 return new ActiveXObject(getDomDocumentPrefix() + ".DomDocument");
96 }
97 catch (ex) {}
98 throw new Error("Your browser does not support XmlDocument objects");
99 };
100
101 // Create the loadXML method and xml getter for Mozilla
102 if (window.DOMParser &&
103 window.XMLSerializer &&
104 window.Node && Node.prototype && Node.prototype.__defineGetter__) {
105
106 // XMLDocument did not extend the Document interface in some versions
107 // of Mozilla. Extend both!
108 XMLDocument.prototype.loadXML =
109 Document.prototype.loadXML = function (s) {
110
111 // parse the string to a new doc
112 var doc2 = (new DOMParser()).parseFromString(s, "text/xml");
113
114 // remove all initial children
115 while (this.hasChildNodes())
116 this.removeChild(this.lastChild);
117
118 // insert and import nodes
119 for (var i = 0; i < doc2.childNodes.length; i++) {
120 this.appendChild(this.importNode(doc2.childNodes[i], true));
121 }
122 };
123
124
125 /**//*
126 * xml getter
127 *
128 * This serializes the DOM tree to an XML String
129 *
130 * Usage: var sXml = oNode.xml
131 *
132 */
133 // XMLDocument did not extend the Document interface in some versions
134 // of Mozilla. Extend both!
135 XMLDocument.prototype.__defineGetter__("xml", function () {
136 return (new XMLSerializer()).serializeToString(this);
137 });
138 Document.prototype.__defineGetter__("xml", function () {
139 return (new XMLSerializer()).serializeToString(this);
140 });
141 }
下面是我调用的过程：
1var xmlHttp = XmlHttp.create();
2 xmlHttp.open("GET", "showMenu.do", false); // async
3 xmlHttp.onreadystatechange = function () {
4 if (xmlHttp.readyState == 4) {
5 getMenuTree(xmlHttp.responseXML);
6 }
7 };
8 xmlHttp.send(null);
这段代码要包含在一个方法中。