Ext Js中Ext.XTemplate使用方法学习

标签：name Js Ext var new data XTemplate

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：

Ext Js中Ext.XTemplate使用方法学习_ext

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
If for="."
While processing an array, the special variable {#}

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：

Ext Js中Ext.XTemplate使用方法学习_object_02

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_ext_03

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_object_04

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_function_05

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 > 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_function_06

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

Execute arbitrary inline code with special built-in template variables

Anything between {[ ... ]}

values: The values in the current scope. If you are using scope changing sub-templates, you can change what values
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_ext_07

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_ext_08

标签：name,Js,Ext,var,new,data,XTemplate
From： https://blog.51cto.com/woshisap/5891917

Ext Js中Ext.XTemplate使用方法学习

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