日期:2014-05-16 浏览次数:20443 次
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????? 这两天在研究ExtJS,对其有了深刻的认识。总结如下:
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?????????? ?根据显示数据量,决定Ext树的类型。如果是大数据量,一般采用创建Ext.tree.AsyncTreeNode根节点的方式
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(即每点击一个树节点后,动态的从后台读取数据。优点:加快显示速度) 。如果数据量小,一般采用Ext.tree.TreeNode
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这样的根节点。
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????? 第一种代码如下:
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<%@ page language="java" contentType="text/html; charset=GBK" pageEncoding="GBK"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=GBK"> <link rel="stylesheet" type="text/css" href="../extjs/resources/css/ext-all.css"/> <script type="text/javascript" src="../extjs/adapter/ext/ext-base.js"></script> <script type="text/javascript" src="../extjs/ext-all.js"></script> <title>树结构</title> <script type="text/javascript"> Ext.onReady(function() { var root = new Ext.tree.AsyncTreeNode({ id : "root", text : "树的根" }); var loader = new Ext.tree.TreeLoader({ url : '<%=request.getContextPath()%>/User_getNodeTree' }); loader.on("beforeload", function(loader, node) { alert("---"+node.id); loader.baseParams.nodeId = node.id; }); var tree = new Ext.tree.TreePanel({ renderTo : "tree", root : root, loader : loader, width : 200, height : 300 }); }); </script> </head> <body> <!-- 要有一定高度Ext2.0,不然看不见 --> <div id="tree" style="overflow:auto; height:100%;width:250px;border:5px solid #c3daf9;"></div> </body> </html>
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??? 实体描述:构造包括 id,text,cls,leaf,href属性的实体
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????后台返回数据:
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?????????? 每次点击一个树节点后,从后台读取该节点的子节点的信息。例如:
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????????????? [{text:'用户',href:'test.jsp',leaf:true},
????????????? ?{text:'管理员',href:'##',leaf:true}]
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第二种树:
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???页面:
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<%@ page language="java" contentType="text/html; charset=GBK" pageEncoding="GBK"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=GBK"> <link rel="stylesheet" type="text/css" href="../extjs/resources/css/ext-all.css"/> <script type="text/javascript" src="../extjs/adapter/ext/ext-base.js"></script> <script type="text/javascript" src="../extjs/ext-all.js"></script> <title>树结构</title> <script type="text/javascript"> Ext.onReady(function() { var treePanel=new Ext.tree.TreePanel({ renderTo : "tree", useArrows:true, autoScroll:true, animate:true, enableDD:true, //是否显示跟节点 rootVisible:false, frame: true, containerScroll: true }); var root=new Ext.tree.AsyncTreeNode({ id:'4', text:'root', leaf:false, loader:new Ext.tree.TreeLoader({dataUrl:'/User_getNodeTree'})}); treePanel.setRootNode(root); treePanel.getRootNode().expand(true); }); </script> </head> <body> <!-- 要有一定高度Ext2.0,不然看不见 --> <div id="tree" style="overflow:auto; height:100%;width:250px;border:5px solid #c3daf9;"></div> </body> </html>
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??? 实体类:
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package com.order.entity; import java.util.List; public class TreeModule{ /* * 此bean用于构建树向其中注入有关的信息,将SysModule中的信息拷贝到JsonTreeModule中 */ private String id; //ID private String text; //节点显示 private String cls; //图标 private boolean leaf; //是否叶子 private String href; //链接 private String hrefTarget; //链接指向 private boolean expa