Extjs4 Treegrid 使用心得分享(经验篇)

最近调试EXTJS 4的treegrid实例，看了很多水友的文章，以及官方的demo， 没一个可靠的，全都无法显示出来。像对于我们习惯用C++的coder来说，EXTJS简直就是一群无政府土匪来维护的，官网上连个搜索框都没有，找资料基本靠遍历，还是人工的。

使用treegrid，需要在调用页面的head中加载以下几个文件：

<link rel="stylesheet" type="text/css" href="css/ext-all.css"> 
<script type="text/javascript" src="ext-all.js"></script> 
<script type="text/javascript" src="treegrid.js"></script>

然后在页面的body中写上一个div

 <div id="tree-example"></div>

以上官方就这么写的，BUT，蛋疼的是，JS里没有改，不改就没法运行成功。把treegrid.js中的renderto，改成我们的div的ID就行了。

记得把json数据文件和css文件等拷贝到调用目录下。
完成的treegrid.js代码为：

/* 
This file is part of Ext JS 4 
Copyright (c) 2011 Sencha Inc 
Contact: http://www.sencha.com/contact 
GNU General Public License Usage 
This file may be used under the terms of the GNU General Public License version 3.0 as published by the Free Software Foundation and appearing in the file LICENSE included in the packaging of this file. Please review the following information to ensure the GNU General Public License version 3.0 requirements will be met: http://www.gnu.org/copyleft/gpl.html. 
If you are unsure which license is appropriate for your use, please contact the sales department at http://www.sencha.com/contact. 
*/ 
Ext.require([ 
'Ext.data.*', 
'Ext.grid.*', 
'Ext.tree.*' 
]); 
Ext.onReady(function() { 
//we want to setup a model and store instead of using dataUrl 
Ext.define('Task', { 
extend: 'Ext.data.Model', 
fields: [ 
{name: 'task', type: 'string'}, 
{name: 'user', type: 'string'}, 
{name: 'duration', type: 'string'} 
] 
}); 
var store = Ext.create('Ext.data.TreeStore', { 
model: 'Task', 
proxy: { 
type: 'ajax', 
//the store will get the content from the .json file 
url: 'treegrid.json' 
}, 
folderSort: true 
}); 
//Ext.ux.tree.TreeGrid is no longer a Ux. You can simply use a tree.TreePanel 
var tree = Ext.create('Ext.tree.Panel', { 
title: 'Core Team Projects', 
width: 500, 
height: 300, 
renderTo: 'tree-example',//2B的官方和SV党们，这里竟然是getbody，bo你妹啊。 
collapsible: true, 
useArrows: true, 
rootVisible: false, 
store: store, 
multiSelect: true, 
singleExpand: true, 
//the 'columns' property is now 'headers' 
columns: [{ 
xtype: 'treecolumn', //this is so we know which column will show the tree 
text: 'Task', 
flex: 2, 
sortable: true, 
dataIndex: 'task' 
},{ 
//we must use the templateheader component so we can use a custom tpl 
xtype: 'templatecolumn', 
text: 'Duration', 
flex: 1, 
sortable: true, 
dataIndex: 'duration', 
align: 'center', 
//add in the custom tpl for the rows 
tpl: Ext.create('Ext.XTemplate', '{duration:this.formatHours}', { 
formatHours: function(v) { 
if (v < 1) { 
return Math.round(v * 60) + ' mins'; 
} else if (Math.floor(v) !== v) { 
var min = v - Math.floor(v); 
return Math.floor(v) + 'h ' + Math.round(min * 60) + 'm'; 
} else { 
return v + ' hour' + (v === 1 ? '' : 's'); 
} 
} 
}) 
},{ 
text: 'Assigned To', 
flex: 1, 
dataIndex: 'user', 
sortable: true 
}] 
}); 
});