ExtJs 3.1 XmlTreeLoader Example Error

前言
　　关键字：ExtJs 3.1 XmlTreeLoader Example Error,XmlTreeLoader 错误,TreePanel Error

　　ExtJs 3.1的XmlTreeLoader例子折腾了我近一个下午加晚上，官方的例子没有问题，可以加载xml的数据，本地IIS死活不行，也不报错，直接查看官方的代码也是一模一样的，今早意外给让我搜到了，不是在官方，而是在貌似一个韩国的博客里面找到的，致敬一下，本文且做其简单中文"译"本。

原文

　　http://javarush.com/entry/ExtJS-XmlTreeLoader-Error 

正文

　　 1.　　代码位置：Ext3.1\examples\tree\xml-tree-loader.js

　　 2.　　注意标红新增代码",requestMethod: 'GET'"!!

/*!
 * Ext JS Library 3.1.0
 * Copyright(c) 2006-2009 Ext JS, LLC
 * licensing@extjs.com
 * http://www.extjs.com/license
 */

//
// Extend the XmlTreeLoader to set some custom TreeNode attributes specific to our application:
//
Ext.app.BookLoader = Ext.extend(Ext.ux.tree.XmlTreeLoader, {
    processAttributes : function(attr){
        if(attr.first){ // is it an author node?

            // Set the node text that will show in the tree since our raw data does not include a text attribute:
            attr.text = attr.first + ' ' + attr.last;

            // Author icon, using the gender flag to choose a specific icon:
            attr.iconCls = 'author-' + attr.gender;

            // Override these values for our folder nodes because we are loading all data at once.  If we were
            // loading each node asynchronously (the default) we would not want to do this:
            attr.loaded = true;
            attr.expanded = true;
        }
        else if(attr.title){ // is it a book node?

            // Set the node text that will show in the tree since our raw data does not include a text attribute:
            attr.text = attr.title + ' (' + attr.published + ')';

            // Book icon:
            attr.iconCls = 'book';

            // Tell the tree this is a leaf node.  This could also be passed as an attribute in the original XML,
            // but this example demonstrates that you can control this even when you cannot dictate the format of
            // the incoming source XML:
            attr.leaf = true;
        }
    }
});

Ext.onReady(function(){

    var detailsText = '<i>Select a book to see more information...</i>';

    var tpl = new Ext.Template(
        '<h2 class="title">{title}</h2>',
        '<p><b>Published</b>: {published}</p>',
        '<p><b>Synopsis</b>: {innerText}</p>',
        '<p><a href="{url}" target="_blank">Purchase from Amazon</a></p>'
    );
    tpl.compile();

    new Ext.Panel({
        title: 'Reading List',
        renderTo: 'tree',
        layout: 'border',
         500,
        height: 500,
        items: [{
            xtype: 'treepanel',
            id: 'tree-panel',
            region: 'center',
            margins: '2 2 0 2',
            autoScroll: true,
            rootVisible: false,
            root: new Ext.tree.AsyncTreeNode(),

            // Our custom TreeLoader:
            loader: new Ext.app.BookLoader({
                dataUrl:'xml-tree-data.xml'
                ,requestMethod: 'GET'
            }),

            listeners: {
                'render': function(tp){
                    tp.getSelectionModel().on('selectionchange', function(tree, node){
                        var el = Ext.getCmp('details-panel').body;
                        if(node && node.leaf){
                            tpl.overwrite(el, node.attributes);
                        }else{
                            el.update(detailsText);
                        }
                    })
                }
            }
        },{
            region: 'south',
            title: 'Book Details',
            id: 'details-panel',
            autoScroll: true,
            collapsible: true,
            split: true,
            margins: '0 2 2 2',
            cmargins: '2 2 2 2',
            height: 220,
            html: detailsText
        }]
    });
});

　　 

结束语

　　不要放弃和接受一次失败的搜索，不断的尝试改变搜索关键字，哪怕是用词霸翻成英文也得努力去试试，看不懂不要紧，看懂代码就行，代码无国界: )