通过store为toolbar添加按钮

目的是实现导航条toolbar可以动态加载按钮。

ExtJS的版本是4.0.

实现方案有两个。方案一:添加render事件监听,在监听事件处理函数中使用Ext.Ajax获取按钮信息,实现动态添加按钮。方案二:定义一个新的类,继承toolbar,为其添加store属性。

方案一比较简单,这里就不详述了。

方案二我们使用ExtJS的MVC做一个演示:

先上演示效果图:

image

以下是演示文件结构:

image

index.jsp代码:

   1:  <%@ page language="java" pageEncoding="utf-8"%>
   2:  <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
   3:  <html>
   4:  <head>
   5:  <title>ExtJs MVC 演示</title>
   6:  <link rel="stylesheet" type="text/css" href="./extjs/resources/css/ext-all.css" />
   7:  <link rel="stylesheet" type="text/css" href="./theme/theme.css" />
   8:  </head>
   9:  <body>
  10:      <script type="text/javascript" src="./extjs/ext-debug.js"></script>
  11:      <script type="text/javascript" src="./extjs/locale/ext-lang-zh_CN.js"></script>
  12:      <script type="text/javascript" src="./app/app.js"></script>
  13:  </body>
  14:  </html>

app.js代码:

   1:  Ext.application({
   2:      name: 'demo',
   3:      controllers:['StoreBarController'],
   4:      autoCreateViewport: true
   5:  });

Viewport.js代码:

   1:  Ext.define('demo.view.Viewport', {
   2:      extend: 'Ext.container.Viewport',
   3:   
   4:      requires: ['demo.view.StoreBar'],
   5:   
   6:      layout: 'fit',
   7:   
   8:      items: [{
   9:          tbar: {xtype: 'storebar'}
  10:      }]
  11:  });

StoreBarController.js代码:

   1:  Ext.define('demo.controller.StoreBarController', {
   2:      extend: 'Ext.app.Controller',
   3:      
   4:      stores: ['BarStore'],
   5:      model: ['BarModel'],
   6:      views: ['StoreBar']
   7:  });

StoreBar.js的代码:

   1:  Ext.define('demo.view.StoreBar', {
   2:      extend: 'Ext.toolbar.Toolbar',
   3:      alias: 'widget.storebar',
   4:      
   5:      store: 'BarStore',
   6:      
   7:      initComponent: function() {
   8:          var me = this;
   9:          me.store = Ext.data.StoreManager.lookup(me.store || 'ext-empty-store');
  10:          me.on('render', me.addButtons);
  11:          this.callParent(arguments);
  12:      },
  13:      
  14:      addButtons: function(){
  15:          var me = this;
  16:          me.store.each(function(record){
  17:              me.add({
  18:                  xtype: 'button',
  19:                  scale: 'large',
  20:                  iconAlign: 'top',
  21:                  text: record.data.text,
  22:                  iconCls: record.data.iconCls
  23:              });
  24:          });
  25:      }
  26:  });

BarStore.js代码:

   1:  Ext.define("demo.store.BarStore",{
   2:      extend:'Ext.data.Store',
   3:      
   4:      model: 'demo.model.BarModel',
   5:      
   6:      data:[{
   7:              text: '系统管理',
   8:              iconCls: 'icon-top-sys'
   9:          },{
  10:              text: '用户管理',
  11:              iconCls: 'icon-top-user'
  12:          }]
  13:  });

BarModel.js代码:

   1:  Ext.define('demo.model.BarModel', {
   2:      extend: 'Ext.data.Model',
   3:      
   4:      fields:['text', 'iconCls']
   5:  });

就是这几个文件了。相应的CSS文件以及图片什么的就不再一一列出了。有心的话可以自己试一下。

 

目前需要的数据是写在了store中,一般我们更喜欢将数据存储在数据库中。接下来做些调整,我们改为从服务器端获取数据。数据存储在store.json中:

   1:  {
   2:      success: true,
   3:      total: 2,
   4:      root: [
   5:          {id: 1, text: '系统管理', iconCls: 'icon-top-sys'},
   6:          {id: 2, text: '用户管理', iconCls: 'icon-top-user'}
   7:      ]
   8:  }

调整BarStore.js:

   1:  Ext.define('demo.store.BarStore', {
   2:      extend: 'Ext.data.Store',
   3:      model: 'demo.model.BarModel',
   4:   
   5:      proxy: {
   6:          type: 'ajax',
   7:          url: 'store.json',
   8:          reader: {
   9:              type: 'json',
  10:              root: 'root',
  11:              successProperty: 'success'
  12:          }
  13:      }
  14:  });

调整StoreBar.js的代码:

   1:  Ext.define('demo.view.StoreBar', {
   2:      extend: 'Ext.toolbar.Toolbar',
   3:      alias: 'widget.storebar',
   4:      
   5:      store: 'BarStore',
   6:      
   7:      initComponent: function() {
   8:          var me = this;
   9:          me.store = Ext.getStore('BarStore');
  10:          me.store.load({
  11:                  scope: this,
  12:                  callback: function(records) {
  13:                          Ext.each(records, function(record){
  14:                              me.add({
  15:                                  xtype: 'button',
  16:                                  scale: 'large',
  17:                                  iconAlign: 'top',
  18:                                  text: record.data.text,
  19:                                  iconCls: record.data.iconCls
  20:                              });
  21:                          });
  22:                  }
  23:          });
  24:          
  25:          this.callParent(arguments);
  26:      }
  27:  });

这里对store进行了主动加载,添加按钮也是写在了store加载的callback函数中,目的是防止store加载出现延迟,按钮不能及时添加的情况。

demo演示资源下载:http://download.csdn.net/detail/tianxiexingyun/7332057

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