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Ext 多层表头实现

EXTCSSHTML 
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GB18030">
<title>Insert title here</title>
	<link rel="stylesheet" type="text/css" href="../resources/libs/ext/resources/css/ext-all.css" />
	<script type="text/javascript" src="../resources/libs/ext/adapter/ext/ext-base.js"></script>
	<script type="text/javascript" src="../resources/libs/ext/ext-all.js"></script>
	
	<script type="text/javascript" src="../resources/ColumnHeaderGroup.js"></script>
	<script type="text/javascript" src="../resources/examples.js"></script>
	<!--注意css中的图片路径    否则效果问题-->
	<link rel="stylesheet" type="text/css" href="../resources/ColumnHeaderGroup.css" />
	
	
</head>
<body>
	<div id="column-group-grid"></div>
</body>
<script type="text/javascript">
Ext.onReady(function() {
    var structure = {//第二层表格数据
        '': ['产品代码', '组合名称','具体单券','盯市净值'],
        'VaR95%': ['绝对值', '占比'],
		'VaR97%':['绝对值', '占比'],
		'VaR99%':['绝对值', '占比']
    },
    products = ['ProductX', 'ProductY'],
    fields = [],
    columns = [],
    data = [],
    continentGroupRow = [],
    cityGroupRow = [];
        
    /*
     * Example method that generates:
     * 1) The column configuration for the grid
     * 2) The column grouping configuration
     * 3) The data for the store
     * 4) The fields for the store
     */
    function generateConfig(){
        var arr,
            numProducts = products.length;
			
	////////嵌套循环begin		
			
            //定义第一层国家列
        Ext.iterate(structure, function(continent, cities){//continent:代表Asia、Europe   cities：代表Berlin、Londeon、Paris
            continentGroupRow.push({
                header: continent,
                align: 'center',
                colspan: cities.length//制定占列数
            });	
			
			
			//定义第二层城市列
            Ext.each(cities, function(city){
                    fields.push({
                        type: 'int',
                        name: city + continent
                    });
                    columns.push({
                        dataIndex: city + continent,
                        header: city,
                        renderer: Ext.util.Format.usMoney
                    });
                });
					
                arr = [];
                for(var i = 0; i < 20; ++i){
                    arr.push((Math.floor(Math.random()*11) + 1) * 100000);
                }
                data.push(arr);
            });
    }

    // Run method to generate columns, fields, row grouping
    generateConfig();
    
    var group = new Ext.ux.grid.ColumnHeaderGroup({//插件   ：前面两层表头
        rows: [continentGroupRow]
    });
    var grid = new Ext.grid.GridPanel({
        renderTo: 'column-group-grid',
        title: 'Sales By Location',
        width: 1000,
        height: 400,
        store: new Ext.data.ArrayStore({
            fields: fields,
            data: data
        }),
        columns: columns,
        viewConfig: {
            forceFit: true
        },
        plugins: group
    });
});
</script>
</html>
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