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Ext.grid.PivotAxis的一个BUG

EXTJS3.xBUGPivotAxis 
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本人在工作中发现Ext.grid.PivotAxis的一个Bug。虽然说这玩意儿是一个半成品，新版本的EXTJS中已经找不到踪影，但是还是发表一下，以备用到过这玩意儿的程序员借鉴。已经在EXTJS的论坛报BUG ：[url]http://www.sencha.com/forum/showthread.php?262138-A-bug-in-Ext.grid.PivotAxis [/url]  懒得看英文的话，在下在这里再解释一下。

该类的buildHeaders方法有如下代码片段 

   buildHeaders: function() {
        var tuples     = this.getTuples(),
            rowCount   = tuples.length,
            dimensions = this.dimensions,
            dimension,
            colCount   = dimensions.length,
            headers    = [],
            tuple, rows, currentHeader, previousHeader, span, start, isLast, changed, i, j;
        
        for (i = 0; i < colCount; i++) {
            dimension = dimensions[i];
            rows  = [];
            span  = 0;
            start = 0;
            
            for (j = 0; j < rowCount; j++) {
                tuple  = tuples[j];
                isLast = j == (rowCount - 1);
                currentHeader = tuple.data[dimension.dataIndex];
                
                /*
                 * 'changed' indicates that we need to create a new cell. This should be true whenever the cell
                 * above (previousHeader) is different from this cell, or when the cell on the previous dimension
                 * changed (e.g. if the current dimension is Product and the previous was Person, we need to start
                 * a new cell if Product is the same but Person changed, so we check the previous dimension and tuple)
                 */
                changed = previousHeader != undefined && previousHeader != currentHeader;
                if (i > 0 && j > 0) {
                    changed = changed || tuple.data[dimensions[i-1].dataIndex] != tuples[j-1].data[dimensions[i-1].dataIndex];
                }
                
                if (changed) {                    
                    rows.push({
                        header: previousHeader,
                        span  : span,
                        start : start
                    });
                    
                    start += span;
                    span = 0;
                }
                ......

该方法先循环列，再循环行，扫描计算是不是要画新的cell，计算之前的dimension的span。其中有一个逻辑不对，它只检查和上面一行的cell，或者之前一列上下行是否一样。而我认为需要检查当前cell之前的所有列的上下行是否一致。否则画出来的表格会比右边的数据行数少。把下面的文件放在examples\grid下去测一下就会发现：

<!DOCTYPE HTML>
<html>
<head>
<title>Test Page</title>
<meta content="text/html; charset=UTF-8" http-equiv="content-type">
<meta http-equiv="X-UA-Compatible" content="IE=8">
<!-- EID Theme CSS  -->
    <!-- ** CSS ** -->
    <!-- base library -->
    <link rel="stylesheet" type="text/css" href="../../resources/css/ext-all.css" />

    <!-- overrides to base library -->

    <!-- page specific -->
    <link rel="stylesheet" type="text/css" href="../shared/examples.css" />
    <link rel="stylesheet" type="text/css" href="grid-examples.css" />

    <!-- ** Javascript ** -->
    <!-- ExtJS library: base/adapter -->
    <script type="text/javascript" src="../../adapter/ext/ext-base.js"></script>

    <!-- ExtJS library: all widgets -->
    <script type="text/javascript" src="../../ext-all-debug.js"></script>

<script type="text/javascript">

Ext.onReady(function() {
var SaleRecord = Ext.data.Record.create([
       {name: 'D1',   type: 'string'},
{name: 'D2',  type: 'string'},
{name: 'D3',     type: 'string'},
{name: 'D4',    type: 'string'},
{name: 'D5',     type: 'string'},
{name: 'D6',     type: 'string'},
{name: 'D7',     type: 'string'},
{name: 'D8',     type: 'string'},
{name: 'M1',    type: 'int'}
    ]);
var myData = [
{"id":"1","D1":"V1","D2":"Shanghai","D3":"1","D4":"Finance","D5":"Special Finance","D6":"Hank","D7":"aa","D8":"d81","M1":"8888"},
{"id":"2","D1":"V1","D2":"Shanghai","D3":"1","D4":"Finance","D5":"Special Finance","D6":"Hank","D7":"aa","D8":"d80","M1":"8887"},
{"id":"3","D1":"V1","D2":"Shanghai","D3":"1","D4":"Finance","D5":"Special Finance","D6":"Hank","D7":"aa","D8":"d87","M1":"8886"},
{"id":"4","D1":"V2","D2":"Beijing","D3":"1","D4":"Finance","D5":"Special Finance","D6":"Adam","D7":"ab","D8":"d86","M1":"7878"},
{"id":"5","D1":"V2","D2":"Beijing","D3":"1","D4":"Finance","D5":"Special Finance","D6":"Adam","D7":"ac","D8":"d85","M1":"7878"},
{"id":"6","D1":"V2","D2":"Beijing","D3":"1","D4":"Finance","D5":"Special Finance","D6":"Adam","D7":"ab","D8":"d84","M1":"7878"},
{"id":"7","D1":"V2","D2":"Beijing","D3":"1","D4":"Finance","D5":"Special Finance","D6":"Adam","D7":"ab","D8":"d82","M1":"7878"},
{"id":"8","D1":"V2","D2":"Boston","D3":"1","D4":"Finance","D5":"Special Finance","D6":"Adam","D7":"ac","D8":"d81","M1":"3333"},
{"id":"9","D1":"V2","D2":"Boston","D3":"1","D4":"Finance","D5":"Special Finance","D6":"Adam","D7":"er","D8":"d34","M1":"3333"},
{"id":"10","D1":"V2","D2":"Boston","D3":"1","D4":"Finance","D5":"Special Finance","D6":"Apple","D7":"df","D8":"d80","M1":"7878"},
{"id":"11","D1":"V2","D2":"Boston","D3":"1","D4":"Finance","D5":"Special Finance","D6":"Apple","D7":"df","D8":"d55","M1":"7878"}
];
// A simple store that loads SaleRecord data from a url
var myStore = new Ext.data.Store({
autoLoad: true,
proxy : new Ext.data.MemoryProxy(myData),
reader: new Ext.data.JsonReader({
}, SaleRecord),
});

// Create the PivotGrid itself, referencing the store
var pivot = new Ext.grid.PivotGrid({
title: 'PivotGrid example',
store     : myStore,
aggregator: 'sum',
measure   : 'M1',
renderTo : Ext.getBody(),
viewConfig: {
title: 'Sales Performance'
},
leftAxis: [
{
width: 60,
dataIndex: 'D1'
},
{
width: 150,
dataIndex: 'D2'
},
{
width: 60,
dataIndex: 'D3'
},
{
width: 60,
dataIndex: 'D4'
},
{
width: 60,
dataIndex: 'D5'
},
{
width: 60,
dataIndex: 'D6'
}
],

topAxis: [
{
dataIndex: 'D7'
},
{
dataIndex: 'D8'
}
]
});
});
</script>
</head>
<body>

</body>
</html>


所以我的fix如下： 

isPrecedingChanged : function(tuples,dimensions,currentCol,currentRow){
						var changed = false;
						for(var col= currentCol; col>0; col--){
							if(tuples[currentRow].data[dimensions[col-1].dataIndex] != tuples[currentRow-1].data[dimensions[col-1].dataIndex]){
								changed = true;
								break;
							}
						}
						return changed;
					},

    buildHeaders: function() {
        var me = this, 
            tuples     = this.getTuples(),
            rowCount   = tuples.length,
            dimensions = this.dimensions,
            dimension,
            colCount   = dimensions.length,
            headers    = [],
            tuple, rows, currentHeader, previousHeader, span, start, isLast, changed, i, j;
        
        for (i = 0; i < colCount; i++) {
            dimension = dimensions[i];
            rows  = [];
            span  = 0;
            start = 0;
            
            for (j = 0; j < rowCount; j++) {
                tuple  = tuples[j];
                isLast = j == (rowCount - 1);
                currentHeader = tuple.data[dimension.dataIndex];
                
                /*
                 * 'changed' indicates that we need to create a new cell. This should be true whenever the cell
                 * above (previousHeader) is different from this cell, or when the cell on the previous dimension
                 * changed (e.g. if the current dimension is Product and the previous was Person, we need to start
                 * a new cell if Product is the same but Person changed, so we check the previous dimension and tuple)
                 */
                changed = previousHeader != undefined && previousHeader != currentHeader;
                if (i > 0 && j > 0) {
                    changed = changed || me.isPrecedingChanged(tuples,dimensions,i,j);
                }
                
                if (changed) {                    
                    rows.push({
                        header: previousHeader,
                        span  : span,
                        start : start
                    });
                    
                    start += span;
                    span = 0;
                }
                .......
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