这里主要展示如何使用搜索的关键字过滤DataGrid的行。其实也不是很难，因为DataGrid使用dataProvier可以是ArrayCollection，并且ArrayCollection本身就有过滤的功能即使用变量filterFunction.所以基本上，你的DataGrid和dataProvider像如下的定义：
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[Bindable] public var dpRows:ArrayCollection;
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然后你可以用一种简单的方法来创建过滤的方法：
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public function filterResults():void
{
dpRows.filterFunction = _sortRows;
dpRows.refresh();
}
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最后，是使用_sortRows方法来对符合过滤关键字的行返回一个ture--那行就可见,否则返回false--那行就被隐藏。
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private function _sortRows(item:Object):Boolean
{
var col:String = cmbCol.selectedItem.data as String;
var key:String = keyword.text;
key = key.toLowerCase();
if (key != "")
{
if (col != "any")
{
var value:String = item[col];
value = value.toLowerCase();
if (value.indexOf(key)>= 0)
{
return true;
}
} else {
for (var o:String in item)
{
value = item[o];
value = value.toLowerCase();
if (value.indexOf(key)>= 0)
{
return true;
}
}
}
} else {
return true;
}
return false;
}
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查看Demo演示
所以全部代码：FilterControl.as
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package
{
import mx.collections.ArrayCollection;
import mx.core.Application;
import mx.controls.TextInput;
import mx.controls.Button;
import mx.controls.ComboBox;
public class FilterControl extends Application
{
[Bindable] public var dpColumns:ArrayCollection;
[Bindable] public var dpRows:ArrayCollection;
public var keyword:TextInput;
public var btnFilter:Button;
public var cmbCol:ComboBox;
public function FilterControl()
{
}
public function init():void
{
dpColumns = new ArrayCollection();
dpColumns.addItem({data:'any', label:'Any'});
dpColumns.addItem({data:'type', label:'Type'});
dpColumns.addItem({data:'name', label:'Name'});
dpColumns.addItem({data:'url', label:'URL'});
dpColumns.addItem({data:'desc', label:'Descriptiom'});
dpColumns.addItem({data:'tags', label:'Tags'});
dpRows = new ArrayCollection();
var item:Object = new Object();
item.type = "Website";
item.name = "Expectal.com";
item.url = "http://www.expectal.com";
item.desc = "Your Professional Flash Photo Gallery with Slideshow and Background Music";
item.tags = "Flash, Gallery, Slideshow, Music";
dpRows.addItem(item);
item = new Object();
item.type = "Website";
item.name = "Franto.com Blog";
item.url = "http://blog.franto.com";
item.desc = "Your Professional Flash Photo Gallery with Slideshow and Background Music";
item.tags = "Flash, Flex, AIR, Tutorial";
dpRows.addItem(item);
item = new Object();
item.type = "Tutorial";
item.name = "FlexSpy - Flex/AIR inspector";
item.url = "http://www.franto.com/blog2/flexspy-inspector-in-your-flexair-application";
item.desc = "FlexSpy - Kind of what Firebug does for HTML/Ajax applications but for Flex 2.0/3.0 applications.";
item.tags = "Flex, AIR, Tutorial";
dpRows.addItem(item);
item = new Object();
item.type = "Tutorial";
item.name = "Quick Outline in FlexBuilder - Ctrl+O";
item.url = "http://www.franto.com/blog2/quick-outline-in-flexbuilder-ctrlo";
item.desc = "Speed up your development with Quick Outline in FlexBuilder";
item.tags = "Flex, AIR, Tutorial";
dpRows.addItem(item);
item = new Object();
item.type = "Tutorial";
item.name = "Custom header in DataGrid";
item.url = "http://www.franto.com/blog2/custom-header-in-datagrid";
item.desc = "Custom header in DataGrid";
item.tags = "Flex, AIR, Tutorial";
dpRows.addItem(item);
item = new Object();
item.type = "Tutorial";
item.name = "Custom header in DataGrid 2";
item.url = "http://www.franto.com/blog2/custom-header-in-datagrid-part-2";
item.desc = "Custom header in DataGrid - part 2";
item.tags = "Flex, AIR, Tutorial";
dpRows.addItem(item);
item = new Object();
item.type = "Tutorial";
item.name = "Quick Outline in FlexBuilder - Ctrl+O";
item.url = "http://www.franto.com/blog2/quick-outline-in-flexbuilder-ctrlo";
item.desc = "Speed up your development with Quick Outline in FlexBuilder";
item.tags = "Flex, AIR, Tutorial";
dpRows.addItem(item);
}
public function resetFilter():void
{
keyword.text = "";
filterResults();
}
public function filterResults():void
{
dpRows.filterFunction = _sortRows;
dpRows.refresh();
}
private function _sortRows(item:Object):Boolean
{
var col:String = cmbCol.selectedItem.data as String;
var key:String = keyword.text;
key = key.toLowerCase();
if (key != "")
{
if (col != "any")
{
var value:String = item[col];
value = value.toLowerCase();
if (value.indexOf(key) >= 0)
{
return true;
}
} else {
for (var o:String in item)
{
value = item[o];
value = value.toLowerCase();
if (value.indexOf(key) >= 0)
{
return true;
}
}
}
} else {
return true;
}
return false;
}
}
}
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FilterFunction.mxml:
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<?xml version="1.0" encoding="utf-8"?>
<FilterControl xmlns:mx="http://www.adobe.com/2006/mxml"
xmlns="*"
layout="vertical" applicationComplete="init()">
<mx:Style source="default.css"/>
<mx:HBox width="100%">
<mx:Label text="Filter:"/>
<mx:TextInput id="keyword" width="100%"/>
<mx:ComboBox id="cmbCol" dataProvider="{dpColumns}"/>
</mx:HBox>
<mx:HBox width="100%" horizontalAlign="right">
<mx:Button label="Filter" id="btnFilter" click="filterResults()" width="150"/>
<mx:Button label="Reset" click="resetFilter()" width="150"/>
</mx:HBox>
<mx:DataGrid width="100%" height="100%" dataProvider="{dpRows}" variableRowHeight="true">
<mx:columns>
<mx:DataGridColumn dataField="type" headerText="Type" width="80"/>
<mx:DataGridColumn dataField="name" headerText="Name" width="180"/>
<mx:DataGridColumn dataField="url" headerText="URL"/>
<mx:DataGridColumn dataField="desc" headerText="Description"/>
<mx:DataGridColumn dataField="tags" headerText="Tags" width="200"/>
</mx:columns>
</mx:DataGrid>
</FilterControl>
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本文转自:http://blog.chinaunix.net/u/21684/showart_973418.html