Ext3 grid单元格合并

<style type="text/css">
.grid-row-span .x-grid3-row {
    border-bottom: 0;
}
.grid-row-span .x-grid3-col {
    border-bottom: 1px solid #ededed;
}
.grid-row-span .row-span {
    border-bottom: 1px solid #fff;
}
.grid-row-span .row-span-first {
    position: relative;
}
.grid-row-span .row-span-first .x-grid3-cell-inner {
    position: absolute;
}
.grid-row-span .row-span-last {
    border-bottom: 1px solid #ededed;
}
</style>

　　在jsp页面引入上面的css文件，下面是demo

<script type="text/javascript">
Ext.onReady(function(){
    new Ext.Viewport({
        layout: 'fit',
        items: {
            xtype: 'grid',
            store: new Ext.data.ArrayStore({
                fields: [
                   {name: 'company'},
                   {name: 'price', type: 'float'},
                   {name: 'change', type: 'float'},
                   {name: 'pctChange', type: 'float'},
                   {name: 'lastChange', type: 'date', dateFormat: 'n/j h:ia'},
                   {name: 'industry'}
                ],
                data: [
                    ['3m Co',71.72,0.02,0.03,'4/2 12:00am', 'Manufacturing'],
                    ['Alcoa Inc',29.01,0.42,1.47,'4/1 12:00am', 'Manufacturing'],
                    ['Altria Group Inc',83.81,0.28,0.34,'4/3 12:00am', 'Manufacturing'],
                    ['American Express Company',52.55,0.01,0.02,'4/8 12:00am', 'Finance'],
                    ['American International Group, Inc.',64.13,0.31,0.49,'4/1 12:00am', 'Services'],
                    ['AT&T Inc.',31.61,-0.48,-1.54,'4/8 12:00am', 'Services'],
                    ['Boeing Co.',75.43,0.53,0.71,'4/8 12:00am', 'Manufacturing'],
                    ['Caterpillar Inc.',67.27,0.92,1.39,'4/1 12:00am', 'Services'],
                    ['Citigroup, Inc.',49.37,0.02,0.04,'4/4 12:00am', 'Finance'],
                    ['E.I. du Pont de Nemours and Company',40.48,0.51,1.28,'4/1 12:00am', 'Manufacturing'],
                    ['Exxon Mobil Corp',68.1,-0.43,-0.64,'4/3 12:00am', 'Manufacturing'],
                    ['General Electric Company',34.14,-0.08,-0.23,'4/3 12:00am', 'Manufacturing'],
                    ['General Motors Corporation',30.27,1.09,3.74,'4/3 12:00am', 'Automotive'],
                    ['Hewlett-Packard Co.',36.53,-0.03,-0.08,'4/3 12:00am', 'Computer'],
                    ['Honeywell Intl Inc',38.77,0.05,0.13,'4/3 12:00am', 'Manufacturing'],
                    ['Intel Corporation',19.88,0.31,1.58,'4/2 12:00am', 'Computer'],
                    ['International Business Machines',81.41,0.44,0.54,'4/1 12:00am', 'Computer'],
                    ['Johnson & Johnson',64.72,0.06,0.09,'4/2 12:00am', 'Medical'],
                    ['JP Morgan & Chase & Co',45.73,0.07,0.15,'4/2 12:00am', 'Finance'],
                    ['McDonald\'s Corporation',36.76,0.86,2.40,'4/2 12:00am', 'Food'],
                    ['Merck & Co., Inc.',40.96,0.41,1.01,'4/2 12:00am', 'Medical'],
                    ['Microsoft Corporation',25.84,0.14,0.54,'4/2 12:00am', 'Computer'],
                    ['Pfizer Inc',27.96,0.4,1.45,'4/8 12:00am', 'Services', 'Medical'],
                    ['The Coca-Cola Company',45.07,0.26,0.58,'4/1 12:00am', 'Food'],
                    ['The Home Depot, Inc.',34.64,0.35,1.02,'4/8 12:00am', 'Retail'],
                    ['The Procter & Gamble Company',61.91,0.01,0.02,'4/1 12:00am', 'Manufacturing'],
                    ['United Technologies Corporation',63.26,0.55,0.88,'4/1 12:00am', 'Computer'],
                    ['Verizon Communications',35.57,0.39,1.11,'4/3 12:00am', 'Services'],
                    ['Wal-Mart Stores, Inc.',45.45,0.73,1.63,'4/3 12:00am', 'Retail'],
                    ['Walt Disney Company (The) (Holding Company)',29.89,0.24,0.81,'4/1 12:00am', 'Services']
                ],
                sortInfo: {
                    field: 'industry',
                    direction: 'ASC'
                }
            }),
            cls: 'grid-row-span',
            columns: [
                {header: "Industry", width: 200, sortable: true, renderer: function (value, meta, record, rowIndex, colIndex, store) {
                    var first = !rowIndex || value !== store.getAt(rowIndex - 1).get('industry'),
                        last = rowIndex >= store.getCount() - 1 || value !== store.getAt(rowIndex + 1).get('industry');
                    meta.css += 'row-span' + (first ? ' row-span-first' : '') +  (last ? ' row-span-last' : '');
                    if (first) {
                        var i = rowIndex + 1;
                        while (i < store.getCount() && value === store.getAt(i).get('industry')) {
                            i++;
                        }
                        var rowHeight = 20, padding = 6,
                            height = (rowHeight * (i - rowIndex) - padding) + 'px';
                        meta.attr = 'style="height:' + height + ';line-height:' + height + ';"';
                    }
                    return first ? value : '';
                }, dataIndex: 'industry'},
                {header: "Company", width: 300, sortable: true, dataIndex: 'company'},
                {header: "Price", width: 100, sortable: true, renderer: Ext.util.Format.usMoney, dataIndex: 'price'},
                {header: "Change", width: 100, sortable: true, dataIndex: 'change', renderer: Ext.util.Format.usMoney},
                {header: "Last Updated", width: 100, sortable: true, renderer: Ext.util.Format.dateRenderer('m/d/Y'), dataIndex: 'lastChange'}
            ],
            columnLines: true
        }
    });
});
</script>

　demo为ext 官方论坛的坛友的例子;

如何在自己的例子中实现:

1:引入css,在grid中配置

  cls: 'grid-row-span',

2.配置sortInfo

3.对需要合并的单元格配置renderer方法