Ext Js中Ext.XTemplate使用方法学习

1:基本知识

     XTemplate是Ext.Template扩展的新类,它支持高级功能的模板类,如自动数组输出、条件判断、子模板、基本数学运行、特殊内建的模板变量,直接执行代码和更多的功能

  • Autofilling arrays using templates and sub-templates
  • Conditional processing with basic comparison operators
  • Basic math function support
  • Execute arbitrary inline code with special built-in template variables
  • Custom member functions
  • Many special tags and built-in operators that aren't defined as part of the API, but are supported in the templates that can be created

 

2:简单例子1

 

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>xtemplate</title>
    
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page"/>
    
        
    <script type="text/javascript">
      Ext.onReady(function() {
		//数据源
		var data = {
			name: '博客园',
			read: [{
				book: '开发成功之路---JSP',
				date: '2007-7-7'
			}, {
				book: '大话设计模式',
				date: '2006-6-6'
			}]
		};
		
		//呈现组件
		var mypanel = new Ext.Panel({
			id: "mypanel",
			width: 300,
			frame: true,
			height: 100,
			title: "XTemplate简单示例",
			renderTo: Ext.getBody()
		});
		
		//创建模板
		var tp1 = new Ext.XTemplate(
			'<table width="100%" cellpadding="0" cellspacing="0"><tr><td>编号</td><td>书名</td><td>日期</td></tr>',
			'<tpl for="read">',
			'<tr>',
			'<td>{#}</td><td>{book}</td><td>{date}</td></tr>',
			'</tpl></table>'
		);
		
		//重写绑定模板
		tp1.overwrite(mypanel.body, data);
     });
     
    </script>
  </head>
  <body>

  </body>
</html>


程序效果:

上述代码中使用了标签tpl和操作符for,可以自由切换for所指定的对象作用域来访问声明于模板中的对象,特殊变量#表示当前数组索引+1(由1开始,不是0)

Ext.XTemplate类常用的方法如下:

  applay(): 返回值为void,applyTemplate的简写形式

  compile(): 返回值为Function,把模板编译成一个函数

  form(String/HTMLElement el): 返回值为Ext.Template,从某个元素的value或innerHTML中创建模板

  applyTemplate(Object/Array values): 返回值为String, 返回HTML片段,这块片段是由数据填充模板之后而成

 

                                                                                                 其特性

1:Auto filling of arrays

The tpl tag and the for operator are used to process the provided data object:

  • If the value specified in for is an array, it will auto-fill, repeating the template block inside the tpl tag for each item in the array.
  • If for="." is specified, the data object provided is examined.
  • While processing an array, the special variable {#} will provide the current array index + 1 (starts at 1, not 0)

程序代码:

<script type="text/javascript">
      Ext.onReady(function() {
		//数据源
		var data = {
			name: 'Tommy Maintz',
			title: 'Lead Developer',
			company: 'Sencha Inc.',
			email: '[email protected]',
			address: '5 Cups Drive',
			city: 'Palo Alto',
			state: 'CA',
			zip: '44102',
			drinks: ['Coffee', 'Soda', 'Water'],
			kids: [{
			        name: 'Joshua',
			        age:3
			    },{
			        name: 'Matthew',
			        age:2
			    },{
			        name: 'Solomon',
			        age:0
			}]
			};

		
		//呈现组件
		var mypanel = new Ext.Panel({
			id: "mypanel",
			width: 300,
			frame: true,
			height: 100,
			title: "XTemplate简单示例",
			renderTo: Ext.getBody()
		});
		
		//创建模板
		var tpl = new Ext.XTemplate(
		    '<p>Kids: ',
		    '<tpl for=".">',       // process the data.kids node
		        '<p>{#}. {name}</p>',  // use current array index to autonumber
		    '</tpl></p>'
		);
		
		//重写绑定模板
		tpl.overwrite(mypanel.body, data.kids); // pass the kids property of the data object
		
     });
     
    </script>
  </head>
  <body>

  </body>


程序效果:

 

2: 修改tp1的内容  An example illustrating how the for property can be leveraged to access specified members of the provided data object to populate the template:

var tpl = new Ext.XTemplate(
		    '<p>Name: {name}</p>',
		    '<p>Title: {title}</p>',
		    '<p>Company: {company}</p>',
		    '<p>Kids: ',
		    '<tpl for="kids">',     // interrogate the kids property within the data
		        '<p>{name}</p>',
		    '</tpl></p>'
		);


程序效果:

Ext Js中Ext.XTemplate使用方法学习_第1张图片

 

3:修改tp1的内容, Flat arrays that contain values (and not objects) can be auto-rendered using the special {.} variable inside a loop. This variable will represent the value of the array at the current index:

 

var tpl = new Ext.XTemplate(
		    '<p>{name}\'s favorite beverages:</p>',
		    '<tpl for="drinks">',
		        '<div> - {.}</div>',
		    '</tpl>'
		);


程序效果:

Ext Js中Ext.XTemplate使用方法学习_第2张图片

 

4: 修改tp1的内容,When processing a sub-template, for example while looping through a child array, you can access the parent object's members via the parent object:

 

var tpl = new Ext.XTemplate(
    '<p>Name: {name}</p>',
    '<p>Kids: ',
    '<tpl for="kids">',
        '<tpl if="age > 1">',
            '<p>{name}</p>',
            '<p>Dad: {parent.name}</p>',
        '</tpl>',
    '</tpl></p>'
);


程序效果:

Ext Js中Ext.XTemplate使用方法学习_第3张图片

 

5:修改tp1的内容  The following basic math operators may be applied directly on numeric data values (+ - * /)

 

var tpl = new Ext.XTemplate(     '<p>Name: {name}</p>',     '<p>Kids: ',     '<tpl for="kids">',         '<tpl if="age &gt; 1">',  // <-- Note that the > is encoded             '<p>{#}: {name}</p>',  // <-- Auto-number each item             '<p>In 5 Years: {age+5}</p>',  // <-- Basic math             '<p>Dad: {parent.name}</p>',         '</tpl>',     '</tpl></p>' ); 

 

 

程序效果图:

Ext Js中Ext.XTemplate使用方法学习_第4张图片

 

6:修改tp1的内容    This example demonstrates basic row striping using an inline code block and the xindex variable:

Execute arbitrary inline code with special built-in template variables

Anything between {[ ... ]} is considered code to be executed in the scope of the template. There are some special variables available in that code:

  • values: The values in the current scope. If you are using scope changing sub-templates, you can change what values is.
  • parent: The scope (values) of the ancestor template.
  • xindex: If you are in a looping template, the index of the loop you are in (1-based).
  • xcount: If you are in a looping template, the total length of the array you are looping.
var tpl = new Ext.XTemplate(
    '<p>Name: {name}</p>',
    '<p>Company: {[values.company.toUpperCase() + ", " + values.title]}</p>',
    '<p>Kids: ',
    '<tpl for="kids">',
        '<div class="{[xindex % 2 === 0 ? "even" : "odd"]}">',
        '{name}',
        '</div>',
    '</tpl></p>'
 );

 

CSS样式为:

<style type="text/css">
	   .even {
	     background-color:white;  
	   }
	   
	   .odd {
	     background-color: #ffffd9;
	   }
	</style>
    

 

程序效果图:


Ext Js中Ext.XTemplate使用方法学习_第5张图片
  可以看到偶数行和奇数行显示不同的颜色

 

7:修改tp1的内容

Template member functions

One or more member functions can be specified in a configuration object passed into the XTemplate constructor for more complex processing:

var tpl = new Ext.XTemplate(
    '<p>Name: {name}</p>',
    '<p>Kids: ',
    '<tpl for="kids">',
        '<tpl if="this.isGirl(name)">',
            '<p>Girl: {name} - {age}</p>',
        '</tpl>',
         // use opposite if statement to simulate 'else' processing:
        '<tpl if="this.isGirl(name) == false">',
            '<p>Boy: {name} - {age}</p>',
        '</tpl>',
        '<tpl if="this.isBaby(age)">',
            '<p>{name} is a baby!</p>',
        '</tpl>',
    '</tpl></p>',
    {
        // XTemplate configuration:
        compiled: true,
        // member functions:
        isGirl: function(name){
           return name == 'Sara Grace';
        },
        isBaby: function(age){
           return age < 1;
        }
    }
);


程序效果为:

 

Ext Js中Ext.XTemplate使用方法学习_第6张图片

 

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