extjs grid合并单元格

http://blog.csdn.net/kunoy/article/details/7829395

/** 
 * Kunoy 
 * 合并单元格 
 * @param {} grid  要合并单元格的grid对象 
 * @param {} cols  要合并哪几列 [1,2,4] 
 */  
var mergeCells = function(grid,cols){  
    var arrayTr=document.getElementById(grid.getId()+"-body").firstChild.firstChild.firstChild.getElementsByTagName('tr');    
    var trCount = arrayTr.length;  
    var arrayTd;  
    var td;  
    var merge = function(rowspanObj,removeObjs){ //定义合并函数  
        if(rowspanObj.rowspan != 1){  
            arrayTd =arrayTr[rowspanObj.tr].getElementsByTagName("td"); //合并行  
            td=arrayTd[rowspanObj.td-1];  
            td.rowSpan=rowspanObj.rowspan;  
            td.vAlign="middle";               
            Ext.each(removeObjs,function(obj){ //隐身被合并的单元格  
                arrayTd =arrayTr[obj.tr].getElementsByTagName("td");  
                arrayTd[obj.td-1].style.display='none';                           
            });  
        }     
    };    
    var rowspanObj = {}; //要进行跨列操作的td对象{tr:1,td:2,rowspan:5}      
    var removeObjs = []; //要进行删除的td对象[{tr:2,td:2},{tr:3,td:2}]  
    var col;  
    Ext.each(cols,function(colIndex){ //逐列去操作tr  
        var rowspan = 1;  
        var divHtml = null;//单元格内的数值          
        for(var i=1;i<trCount;i++){  //i=0表示表头等没用的行  
            arrayTd = arrayTr[i].getElementsByTagName("td");  
            var cold=0;  
//          Ext.each(arrayTd,function(Td){ //获取RowNumber列和check列  
//              if(Td.getAttribute("class").indexOf("x-grid-cell-special") != -1)  
//                  cold++;                               
//          });  
            col=colIndex+cold;//跳过RowNumber列和check列  
            if(!divHtml){  
                divHtml = arrayTd[col-1].innerHTML;  
                rowspanObj = {tr:i,td:col,rowspan:rowspan}  
            }else{  
                var cellText = arrayTd[col-1].innerHTML;  
                var addf=function(){   
                    rowspanObj["rowspan"] = rowspanObj["rowspan"]+1;  
                    removeObjs.push({tr:i,td:col});  
                    if(i==trCount-1)  
                        merge(rowspanObj,removeObjs);//执行合并函数  
                };  
                var mergef=function(){  
                    merge(rowspanObj,removeObjs);//执行合并函数  
                    divHtml = cellText;  
                    rowspanObj = {tr:i,td:col,rowspan:rowspan}  
                    removeObjs = [];  
                };  
                if(cellText == divHtml){  
                    if(colIndex!=cols[0]){   
                        var leftDisplay=arrayTd[col-2].style.display;//判断左边单元格值是否已display  
                        if(leftDisplay=='none')  
                            addf();   
                        else  
                            mergef();                             
                    }else  
                        addf();                                           
                }else  
                    mergef();             
            }  
        }  
    });   
};