ExtJs 扩展类CheckColumn的使用(事件触发)

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使用 Extjs 在进行数据库编程经常会遇到 checkbox 的问题(奇怪网上却没有此类文章不知道其他人是怎么解决的,在此贴上我的方法,如有问题或建议,欢迎指正), 比如在数据中的 status 存储的值为 'Y' / 'N' 或者是其他非 true / false 的值, 要求显示在gridPanel 中, 如果不进行转换,显示的时候就会有问题,因为 gridPanel 中的 Checkbox(CheckColumn) 的值默认为只有两种： true / false. 这样的话只要 status 的值不为空, 显示到页面的时候 checkbox 都会自动勾上;   
[javascript] view plain copy print?
//下面是修改的步骤：  
[javascript] view plain copy print?
   
   
1. 解决的办法就是, 修改 checkcolumn.js 中 renderer 方法和onMouseDown方法。修改后的代码如下：  
/*!
 * Ext JS Library 3.1.1
 * Copyright(c) 2006-2010 Ext JS, LLC
 * licensing@extjs.com
 * http://www.extjs.com/license
 */
Ext.ns('Ext.ux.grid');
/**
 * @class Ext.ux.grid.CheckColumn
 * @extends Object
 * GridPanel plugin to add a column with check boxes to a grid.
 * <p>Example usage:</p>
 * <pre><code>
// create the column
var checkColumn = new Ext.grid.CheckColumn({
   header: 'Indoor?',
   dataIndex: 'indoor',
   id: 'check',
    55
});
// add the column to the column model
var cm = new Ext.grid.ColumnModel([{
       header: 'Foo',
       ...
    },
    checkColumn
]);
// create the grid
var grid = new Ext.grid.EditorGridPanel({
    ...
    cm: cm,
    plugins: [checkColumn], // include plugin
    ...
});
 * </code></pre>
 * In addition to storing a Boolean value within the record data, this
 * class toggles a css class between <tt>'x-grid3-check-col'</tt> and
 * <tt>'x-grid3-check-col-on'</tt> to alter the background image used for
 * a column.
 */
Ext.ux.grid.CheckColumn = function(config){
    Ext.apply(this, config);
    if(!this.id){
        this.id = Ext.id();
    }
    this.renderer = this.renderer.createDelegate(this);
};
Ext.ux.grid.CheckColumn.prototype ={
    init : function(grid){
        this.grid = grid;
        this.grid.on('render', function(){
            var view = this.grid.getView();
            view.mainBody.on('mousedown', this.onMouseDown, this);
        }, this);
    },
    onMouseDown : function(e, t){
        if(Ext.fly(t).hasClass(this.createId())){
            e.stopEvent();
            var index = this.grid.getView().findRowIndex(t);
            var record = this.grid.store.getAt(index);
            var value = record.data[this.dataIndex];
         switch(value)
         {
             case 'Y':
               value = 'N';
               break;
             case 'N':
               value = 'Y';
               break;
             default:
               value = !value;
         }
            record.set(this.dataIndex, value);
        }
    },
    renderer : function(v, p, record){
     p.css += ' x-grid3-check-col-td'; 
     return String.format('<div class="x-grid3-check-col{0} {1}">&nbsp;</div>',   v=='Y' || v== true ? '-on' : '', this.createId());
    },
    
    createId : function(){
        return 'x-grid3-cc-' + this.id;
    }
};
// register ptype
Ext.preg('checkcolumn', Ext.ux.grid.CheckColumn);
// backwards compat
Ext.grid.CheckColumn = Ext.ux.grid.CheckColumn;
 
//下面这个是页面文件也贴出来，当时做这个模块的时候也差了不少资料，与人分享，才会快乐。

<%@ page language="Java" pageEncoding="UTF-8" %>
<%@ include file="/WEB-INF/views/common/head.jsp" %>
<title></title>
<!-- Extjs导入 -->
<link rel="stylesheet" href="${pageContext.request.contextPath}/css/common_viewport.css" type="text/css">
</link>
<script type="text/JavaScript" src="${pageContext.request.contextPath}/js/list_viewport.js">
</script>
<script type="text/javascript" src="${pageContext.request.contextPath}/extjs/ux/CheckColumn.js">
</script>
<style type="text/css">
    .store-info {
        background: url('${pageContext.request.contextPath}/imgs/store-info.gif') left top no-repeat;
    }
    
    body {
        font-size: 12px;
    }
</style>
<script type="text/javascript">
    Ext.onReady(function(){
     
  var adminColumn = new Ext.grid.CheckColumn({
     header: '系统管理员维护？',
     dataIndex: 'sfxtwh',
      100
  });
    
     var studentUpdColumn = new Ext.grid.CheckColumn({
     header: '学生可改？',
     dataIndex: 'sfkxg',
     id:'_student_update',
      80
  });
  
  var studentAllowBlankColumn = new Ext.grid.CheckColumn({
     header: '学生必填？',
     dataIndex: 'sfbt',
     id:'_student_allow',
      80
  });
  
  //列表数据对象  
        var dataStore = new Ext.data.JsonStore({
            autoDestroy: true,
            //autoLoad:true,
            pruneModifiedRecords: true,
            root:'dataList',
            totalProperty:'totalCount',
            url: contextPath+'/xg/zdsz/xszdszAction.do?method=getXszdszByPage&tableName=XSZHGL_XSXXB',
            fields: ["id",'columnname',"sfkxg","sfxtwh","sfbt"]
        });
        dataStore.load();
        
        //列表
        var dataGrid = new Ext.grid.EditorGridPanel({
            stripeRows: true,
            autoScroll: true,
            trackMouseOver: true,
            border: false,
            loadMask: true,
            sm: checkboxModel,
            plugins: [adminColumn, studentUpdColumn, studentAllowBlankColumn],
            //其他代码省略,这里是grid的listeners属性的配置代码
   listeners : {
     'afteredit' : function(e) {
      alert(e.value);
      Ext.Ajax.request({
       url : 'updateUser.action',
       params : {
        filedName : e.field,
        fieldValue : e.value,
        userId : e.record.data.userId
       },
       success : function() {
        //alert('ok');
       },
       failure : function() {
        Ext.Msg.show({
         title : '错误提示',
         msg : '修改数据发生错误,操作将被回滚!',
         fn : function() {
          e.record.set(e.field, e.originalValue);
         },
         buttons : Ext.Msg.OK,
         icon : Ext.Msg.ERROR
        });
       }
      });
     }
   },
            //列模型
            cm:new Ext.grid.ColumnModel([
             {
     header:'字段名称',
     sortable:true,
     dataIndex:'columnname',
     200
    },adminColumn, studentUpdColumn, studentAllowBlankColumn
            ]),
            //数据
            store: dataStore,
   bbar: new Ext.PagingToolbar({
                pageSize: 15,
                store: dataStore,
                displayInfo: true,
                beforePageText: '第',
                afterPageText: '页，共 {0} 页',
                displayMsg: '当前为第<font style="color:red">{0} - {1}</font> 条记录，共<font style="color:red">{2}</font> 条记录',
                emptyMsg: "没有找到相关信息"
            })
        });
        //添加列表
        dataPanel.add(dataGrid);
        initDataTbar([_save, "-", _refresh, "-", _condition]);
 
        /*事件控制*****************************/
        
        //刷新
        getRefreshBtn().on('click', function(){
            dataStore.reload();
        });
       
        //实例化主界面(添加所有控件后)
        var mianFrame = new MianFrame();
        setNavigate("学工管理 >> 学生基本信息设置");
        
    });
    
</script>
</head>
<body>
    <input type="hidden" id='qx' value='${qxlx}'><input type="hidden" id='mkid' value='${mkid}'>
    <table width="100%" height='100%'>
        <tr>
            <td align="center" valign="middle">
                <div id='loadDiv' style="font-size:12px;">
                    <img width='50' height='50' src='${pageContext.request.contextPath}/imgs/login-load.gif'>数据加载中，请稍后 . . .
                </div>
            </td>
        </tr>
    </table>
</body>
</html>

//如果修改的数据要及时的与后台交互的话，可以给editGridPanel添加afterEdit事件，如上面的js文件，但要提前修改CheckColumn的中onMouseDown方法，如下：
onMouseDown : function(e, t) {
        if (t.className && t.className.indexOf('x-grid3-cc-' + this.id) != -1) {
            e.stopEvent();
            var index = this.grid.getView().findRowIndex(t);
            var cindex = this.grid.getView().findCellIndex(t);
            var record = this.grid.store.getAt(index);
            var value = record.data[this.dataIndex];
   
            var field = this.grid.colModel.getDataIndex(cindex);
            var e = {
                grid : this.grid,
                record : record,
                field : field,
                originalValue : record.data[this.dataIndex],
                value : !record.data[this.dataIndex],
                row : index,
                column : cindex,
                cancel : false
            };
            if (this.grid.fireEvent("validateedit", e) !== false && !e.cancel) {
                delete e.cancel;
                record.set(this.dataIndex, !record.data[this.dataIndex]);
                this.grid.fireEvent("afteredit", e);
            }
            
        }
    }

已上资料希望对你有帮助！！！分享快乐！（下图是系统实现的效果）