首先导入Ext.ux.tree.XmlTreeLoader.js
/*!
* Ext JS Library 3.2.0
* Copyright(c) 2006-2010 Ext JS, Inc.
* licensing@extjs.com
* http://www.extjs.com/license
*/
Ext.ns('Ext.ux.tree');
/**
* @class Ext.ux.tree.XmlTreeLoader
* @extends Ext.tree.TreeLoader
*
A TreeLoader that can convert an XML document into a hierarchy of {@link Ext.tree.TreeNode}s.
* Any text value included as a text node in the XML will be added to the parent node as an attribute
* called innerText. Also, the tag name of each XML node will be added to the tree node as
* an attribute called tagName.
*
By default, this class expects that your source XML will provide the necessary attributes on each
* node as expected by the {@link Ext.tree.TreePanel} to display and load properly. However, you can
* provide your own custom processing of node attributes by overriding the {@link #processNode} method
* and modifying the attributes as needed before they are used to create the associated TreeNode.
* @constructor
* Creates a new XmlTreeloader.
* @param {Object} config A config object containing config properties.
*/
Ext.ux.tree.XmlTreeLoader = Ext.extend(Ext.tree.TreeLoader, {
/**
* @property XML_NODE_ELEMENT
* XML element node (value 1, read-only)
* @type Number
*/
XML_NODE_ELEMENT : 1,
/**
* @property XML_NODE_TEXT
* XML text node (value 3, read-only)
* @type Number
*/
XML_NODE_TEXT : 3,
// private override
processResponse : function(response, node, callback){
var xmlData = response.responseXML;
var root = xmlData.documentElement || xmlData;
try{
node.beginUpdate();
node.appendChild(this.parseXml(root));
node.endUpdate();
if(typeof callback == "function"){
callback(this, node);
}
}catch(e){
this.handleFailure(response);
}
},
// private
parseXml : function(node) {
var nodes = [];
Ext.each(node.childNodes, function(n){
if(n.nodeType == this.XML_NODE_ELEMENT){
var treeNode = this.createNode(n);
if(n.childNodes.length > 0){
var child = this.parseXml(n);
if(typeof child == 'string'){
treeNode.attributes.innerText = child;
treeNode.text = child;
}else{
treeNode.appendChild(child);
}
}
nodes.push(treeNode);
}
else if(n.nodeType == this.XML_NODE_TEXT){
var text = n.nodeValue.trim();
if(text.length > 0){
return nodes = text;
}
}
}, this);
return nodes;
},
// private override
createNode : function(node){
var attr = {
tagName: node.tagName
};
Ext.each(node.attributes, function(a){
attr[a.nodeName] = a.nodeValue;
});
this.processAttributes(attr);
return Ext.ux.tree.XmlTreeLoader.superclass.createNode.call(this, attr);
},
/*
* Template method intended to be overridden by subclasses that need to provide
* custom attribute processing prior to the creation of each TreeNode. This method
* will be passed a config object containing existing TreeNode attribute name/value
* pairs which can be modified as needed directly (no need to return the object).
*/
processAttributes: Ext.emptyFn
});
//backwards compat
Ext.ux.XmlTreeLoader = Ext.ux.tree.XmlTreeLoader;
然后添加针对XML文件格式的子类：
Ext.app.TestLoader = Ext.extend(Ext.ux.tree.XmlTreeLoader, {
processAttributes : function(attr){
if(attr.tagName=="category"){
attr.text = attr.name;
//attr.iconCls = '';
attr.loaded = true;
attr.expanded = false;
if(attr.isValid != "true"){
attr.hidden = true;
}
}
else if(attr.tagName=="select"){
//attr.iconCls = '';
attr.leaf = true;
}
}
});
Tree中数据的载入：
var tree = new Ext.tree.TreePanel({
renderTo: 'item',
width: 500,
height: 500,
autoScroll:true,
rootVisible: true,
root: new Ext.tree.AsyncTreeNode({
text: 'Root,
expanded: true
}),
loader: new Ext.app.TestLoader({
dataUrl:'data.xml'
})
});