dojox.grid.DataGrid 编程篇(3) -- DataGrid的一些Bug

LibraryPKU 2014-04-17

展开全文

dojox.grid.DataGrid 里存在一些 Bug，本篇将介绍如何解决它们：

1. layout定义为%时，滚动条的问题：
如下图，当列宽用"%"定义时，无论如何调整比例(就算不满100%) 也会出现横向滚动条。(IE, chrome 都有这个bug)

[html] view plain copy

<table dojoType='dojox.grid.DataGrid' id='grid1' jsid='js_grid1'
style='border:1px #a8a8a8 solid;width:450px;height:200px;' store="getDataStore(10)"
selectionMode='single' >
<thead>
<tr>
<th field="f1" width="20%" >列1</th>
<th field="f2" width="20%" >列2</th>
<th field="f3" width="20%" >列3</th>
<th field="f4" width="20%" >列4</th>
<th field="f5" width="20%" >列5</th>
</tr>
</thead>
</table>

通过继承 dojox.grid._View 重写 getScrollbarWidth() 方法，使得 ViewContentWidth 不会产生 overflow。

【dojo 1.8】

[javascript] view plain copy

define("DataGridEx",
["dojox/grid/DataGrid", "dojox/grid/_View", "dojo/_base/html", "dojox/html/metrics"],
function(DataGrid, _View, html, metrics) {
var declare = dojo.declare;
var ViewEx = declare("ViewEx", _View, {
getScrollbarWidth: function(){
var hasScrollSpace = this.hasVScrollbar();
var overflow = html.style(this.scrollboxNode, "overflow");
if(this.noscroll || !overflow || overflow == "hidden"){
hasScrollSpace = false;
}else if(overflow == "scroll"){
hasScrollSpace = true;
}
// 稍微扩大 scrollbar 的宽度
return (hasScrollSpace ? metrics.getScrollbar().w+2: 0); // Integer
}
});
var DataGridEx = declare("DataGridEx", DataGrid, {
createView: function(inClass, idx){
// 改用继承后的 View 类
var view = new ViewEx({ grid: this, index: idx });
this.viewsNode.appendChild(view.domNode);
this.viewsHeaderNode.appendChild(view.headerNode);
this.views.addView(view);
html.attr(this.domNode, "align", this.isLeftToRight() ? 'left' : 'right');
return view;
}
});
DataGridEx.markupFactory = DataGrid.markupFactory;
return DataGridEx;
});