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  • ExtJS 使用点滴 四 XTemplate使用方法

    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

    [html] view plaincopyprint?
    1. <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> 
    2. <% 
    3. String path = request.getContextPath(); 
    4. String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; 
    5. %> 
    6.  
    7. <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 
    8. <html> 
    9.   <head> 
    10.     <base href="<%=basePath%>"> 
    11.      
    12.     <title>xtemplate</title> 
    13.      
    14.     <meta http-equiv="pragma" content="no-cache"> 
    15.     <meta http-equiv="cache-control" content="no-cache"> 
    16.     <meta http-equiv="expires" content="0">     
    17.     <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> 
    18.     <meta http-equiv="description" content="This is my page"/> 
    19.      
    20.          
    21.     <script type="text/javascript"> 
    22.       Ext.onReady(function() { 
    23.         //数据源 
    24.         var data = { 
    25.             name: '博客园', 
    26.             read: [{ 
    27.                 book: '开发成功之路---JSP', 
    28.                 date: '2007-7-7' 
    29.             }, { 
    30.                 book: '大话设计模式', 
    31.                 date: '2006-6-6' 
    32.             }] 
    33.         }; 
    34.          
    35.         //呈现组件 
    36.         var mypanel = new Ext.Panel({ 
    37.             id: "mypanel", 
    38.             300, 
    39.             frame: true, 
    40.             height: 100, 
    41.             title: "XTemplate简单示例", 
    42.             renderTo: Ext.getBody() 
    43.         }); 
    44.          
    45.         //创建模板 
    46.         var tp1 = new Ext.XTemplate( 
    47.             '<table width="100%" cellpadding="0" cellspacing="0"><tr><td>编号</td><td>书名</td><td>日期</td></tr>', 
    48.             <span style="color: rgb(255, 0, 0);">'<tpl for="read">',</span> 
    49.             '<tr>', 
    50.             <span style="color: rgb(255, 0, 0);">'<td>{#}</td><td>{book}</td><td>{date}</td></tr>'</span>, 
    51.             <span style="color: rgb(255, 0, 0);">'</tpl></table>'</span> 
    52.         ); 
    53.          
    54.         //重写绑定模板 
    55.         tp1.overwrite(mypanel.body, data); 
    56.      }); 
    57.       
    58.     </script> 
    59.   </head> 
    60.   <body> 
    61.  
    62.   </body> 
    63. </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：

    [html] view plaincopyprint?
    1. <script type="text/javascript"> 
    2.       Ext.onReady(function() { 
    3.         //数据源 
    4.         var data = { 
    5.             name: 'Tommy Maintz', 
    6.             title: 'Lead Developer', 
    7.             company: 'Sencha Inc.', 
    8.             email: 'tommy@sencha.com', 
    9.             address: '5 Cups Drive', 
    10.             city: 'Palo Alto', 
    11.             state: 'CA', 
    12.             zip: '44102', 
    13.             drinks: ['Coffee', 'Soda', 'Water'], 
    14.             kids: [{ 
    15.                     name: 'Joshua', 
    16.                     age:3 
    17.                 },{ 
    18.                     name: 'Matthew', 
    19.                     age:2 
    20.                 },{ 
    21.                     name: 'Solomon', 
    22.                     age:0 
    23.             }] 
    24.             }; 
    25.  
    26.          
    27.         //呈现组件 
    28.         var mypanel = new Ext.Panel({ 
    29.             id: "mypanel", 
    30.             300, 
    31.             frame: true, 
    32.             height: 100, 
    33.             title: "XTemplate简单示例", 
    34.             renderTo: Ext.getBody() 
    35.         }); 
    36.          
    37.         //创建模板 
    38.         var tpl = new Ext.XTemplate( 
    39.             '<p>Kids: ', 
    40.             '<tpl for=".">',       // process the data.kids node 
    41.                 '<p>{#}. {name}</p>',  // use current array index to autonumber 
    42.             '</tpl></p>' 
    43.         ); 
    44.          
    45.         //重写绑定模板 
    46.         tpl.overwrite(mypanel.body, data.kids); // pass the kids property of the data object 
    47.          
    48.      }); 
    49.       
    50.     </script> 
    51.   </head> 
    52.   <body> 
    53.  
    54.   </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:

    [html] view plaincopyprint?
    1. var tpl = new Ext.XTemplate( 
    2.             '<p>Name: {name}</p>', 
    3.             '<p>Title: {title}</p>', 
    4.             '<p>Company: {company}</p>', 
    5.             '<p>Kids: ', 
    6.             '<tpl for="kids">',     // interrogate the kids property within the data 
    7.                 '<p>{name}</p>', 
    8.             '</tpl></p>' 
    9.         ); 


    程序效果：

    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:

    [html] view plaincopyprint?
    1. var tpl = new Ext.XTemplate( 
    2.             '<p>{name}\'s favorite beverages:</p>', 
    3.             '<tpl for="drinks">', 
    4.                 '<div> - {.}</div>', 
    5.             '</tpl>' 
    6.         ); 


    程序效果：

    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:

    [html] view plaincopyprint?
    1. var tpl = new Ext.XTemplate( 
    2.     '<p>Name: {name}</p>', 
    3.     '<p>Kids: ', 
    4.     '<tpl for="kids">', 
    5.         '<tpl if="age > 1">', 
    6.             '<p>{name}</p>', 
    7.             '<p>Dad: {parent.name}</p>', 
    8.         '</tpl>', 
    9.     '</tpl></p>' 
    10. ); 


    程序效果：

    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：

    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.
    [javascript] view plaincopyprint?
    1. var tpl = new Ext.XTemplate( 
    2.     '<p>Name: {name}</p>', 
    3.     '<p>Company: {[values.company.toUpperCase() + ", " + values.title]}</p>', 
    4.     '<p>Kids: ', 
    5.     '<tpl for="kids">', 
    6.         '<div class="{[xindex % 2 === 0 ? "even" : "odd"]}">', 
    7.         '{name}', 
    8.         '</div>', 
    9.     '</tpl></p>' 
    10. ); 

    CSS样式为：

    [css] view plaincopyprint?
    1. <style type="text/css"> 
    2.        .even { 
    3.          background-color:white;   
    4.        } 
    5.         
    6.        .odd { 
    7.          background-color: #ffffd9; 
    8.        } 
    9.     </style> 
    10.      

    程序效果图：



      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:

    [javascript] view plaincopyprint?
    1. var tpl = new Ext.XTemplate( 
    2.     '<p>Name: {name}</p>', 
    3.     '<p>Kids: ', 
    4.     '<tpl for="kids">', 
    5.         '<tpl if="this.isGirl(name)">', 
    6.             '<p>Girl: {name} - {age}</p>', 
    7.         '</tpl>', 
    8.          // use opposite if statement to simulate 'else' processing: 
    9.         '<tpl if="this.isGirl(name) == false">', 
    10.             '<p>Boy: {name} - {age}</p>', 
    11.         '</tpl>', 
    12.         '<tpl if="this.isBaby(age)">', 
    13.             '<p>{name} is a baby!</p>', 
    14.         '</tpl>', 
    15.     '</tpl></p>', 
    16.     { 
    17.         // XTemplate configuration: 
    18.         compiled: true, 
    19.         // member functions: 
    20.         isGirl: function(name){ 
    21.            return name == 'Sara Grace'; 
    22.         }, 
    23.         isBaby: function(age){ 
    24.            return age < 1; 
    25.         } 
    26.     } 
    27. ); 


    程序效果为：
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  • 原文地址：https://www.cnblogs.com/FredTang/p/2629991.html
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