将数据网格向下或向上滚动到所选索引行（Flex）。

Question

我正在一个数据网格中执行查找操作，针对其中的一列。当我找到包含该项的行时，我将其作为选定索引行，以突出显示它。但现在我还想滚动数据网格向下或向上（如果该项超出屏幕范围），以便在此查找操作中自动显示已选中的项。

谢谢。

- Tintin

Answer 1

你尝试过scrolltoindex()方法吗？看看Anuj Gakhar的文章，了解如何在datagrid中使用scrolltoindex()。

以下是该文章中的示例：

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute"
initialize="doInit();" creationComplete="setSelectedItem()">
<mx:Script>
<![CDATA[
import mx.collections.ArrayCollection;

// this holds the grid data
[Bindable]
private var myData:ArrayCollection = new ArrayCollection();
// change this name here to change the selected item on load
[Bindable]
private var initialFName:String = "Joe9";

private function doInit():void
{
myData.addItem({fname:"Joe",lname:"Bloggs"});
myData.addItem({fname:"Joe1",lname:"Bloggs"});
myData.addItem({fname:"Joe2",lname:"Bloggs"});
myData.addItem({fname:"Joe3",lname:"Bloggs"});
myData.addItem({fname:"Joe4",lname:"Bloggs"});
myData.addItem({fname:"Joe5",lname:"Bloggs"});
myData.addItem({fname:"Joe6",lname:"Bloggs"});
myData.addItem({fname:"Joe7",lname:"Bloggs"});
myData.addItem({fname:"Joe8",lname:"Bloggs"});
myData.addItem({fname:"Joe9",lname:"Bloggs"});
}

private function setSelectedItem():void
{
var gData:Object = dGrid.dataProvider;
for(var i:Number=0; i < gData.length; i++)
{
var thisObj:Object = gData.getItemAt(i);
if(thisObj.fname == initialFName)
{
dGrid.selectedIndex = i;
//sometimes scrollToIndex doesnt work if validateNow() not done
dGrid.validateNow();
dGrid.scrollToIndex(i);
}
}
}
]]>
</mx:Script>

<mx:DataGrid id="dGrid"  dataProvider="{myData}"  visible="true">
<mx:columns>
<mx:DataGridColumn dataField="fname" headerText="FirstName" />
<mx:DataGridColumn dataField="lname" headerText="LastName" />
</mx:columns>
</mx:DataGrid>

</mx:Application>

- Jason Towne