Flex中的DataGrid的内容处理
Flex中的DataGrid的内容处理
1.介绍一下DataGrid中数据的增加/删除/获取。
添加/删除
由于DataGrid的数据都绑定于Array或XML,所以我们需要增加记当或删除记录的时候..只需要对所绑定的数据进行相应的操作即可。这里就不多说了..一会直接看代码。
要提示一下的是..虽然数据与DataGrid进行的绑定.不过好像修改了数据源不会立刻更新..需要DataGrid对数据源进行一次反向操作(就在是 DataGrid下进行编辑,下一节会介绍),才会进行更新,所以如果希望立刻更新的话..我们可以再指行一次数据指定..
DataGrid.dataProvider = 数据源
获取
这里所说的获取..是当我们对DataGrid进行的操作(点击项目)的时候..进行所点击的位置索引与数据的获取.
(如果要获取指定第几行，每几列的数据，这样对数据源进行操作即可)
当我们侦听itemClick事件的时候..将会接收到一个ListEvent事件对象..对象里分别有所点击单元格的列索引与列索引,我们就从这两个数据进行其它数据的获取..
(ps:下边提到的e为ListEvent事件对象..)
1.所点击的列的表头
(e.target as DataGrid).columns[e.columnIndex].headerText
2.点击的列索引
e.columnIndex
3.点击的行索引
e.rowIndex
4.点击的整行的数据(选中的数据)
(e.target as DataGrid).selectedItem
5.选中的单元格的数据
(e.target as DataGrid).selectedItem[(e.target as DataGrid).columns[e.columnIndex].dataField]
完整代码:
<?xml version="1.0"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" width="450" fontFamily="宋体" fontSize="12" height="400">
<mx:Script>
<![CDATA[
import mx.controls.*;
import mx.events.ListEvent;
import mx.controls.dataGridClasses.*;
private var DataGrid1:DataGrid;
[Bindable]//原始数据
public var dataArr:Array = [{id:1,name:"苹果",count:100},
{id:2,name:"西瓜",count:200},
{id:3,name:"水蜜桃",count:50}]
private function addItem():void{
??????? dataArr.push({id:uiId.value,name:uiName.text,count:uiCount.value})
??????? DataGrid2.dataProvider = dataArr
}
private function delItem():void{
??????? dataArr.pop();
??????? DataGrid2.dataProvider = dataArr
}
private function itemClick(e:ListEvent):void {
Alert.show(DataGrid2.columns[0].headerText);
?? var txt:String = "表头为: "+(e.target as DataGrid).columns[e.columnIndex].headerText+"\n"
?? txt+="选中第 "+e.columnIndex+" 列\n"
?? txt+="选中第 "+e.rowIndex+" 行\n"
?? txt+="选中的行的数据为:\n"
?? var dat:Object = (e.target as DataGrid).selectedItem
?? for(var i:* in dat){
???? txt+=" "+i+":"+dat[i]+"\n"
?? }
?? txt+="选中的单元可格的数据为 "+(e.target as DataGrid).selectedItem[(e.target as DataGrid).columns[e.columnIndex].dataField]+" \n"
?? Alert.show(txt)
?? }
]]>
</mx:Script>
<mx:DataGrid id="DataGrid2" itemClick="itemClick(event)" dataProvider="{dataArr}" width="430" y="10" x="10" height="208">
<mx:columns>
<mx:DataGridColumn headerText="序号" dataField="id"/>
<mx:DataGridColumn headerText="名称" dataField="name"/>
<mx:DataGridColumn headerText="数量" dataField="count" editorDataField="value"/>
</mx:columns>
</mx:DataGrid>
<mx:NumericStepper id="uiId" x="10" y="241" width="150"/>
<mx:TextInput id="uiName" x="10" y="288" width="150"/>
<mx:NumericStepper id="uiCount" x="10" y="335" width="150"/>
<mx:Label x="10" y="224" text="序号："/>
<mx:Label x="10" y="271" text="名称："/>
<mx:Label x="10" y="318" text="数量："/>
<mx:Button click="addItem()" x="10" y="368" label="添加" width="150"/>
<mx:Button click="delItem()" x="290" y="368" label="删除最后一个" width="150"/>
</mx:Application>
?
2.Datagrid数据的移动moveData.mxml
?
<?xml version="1.0" encoding="utf-8"?>??
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" xmlns:window="com.diaztorres.window.*" xmlns:log="com.log.*">??
<mx:Script>??
??? <![CDATA[??
?????? import mx.collections.IList;????
?????? import mx.collections.ArrayCollection??
?????? import mx.controls.Alert;????????
?????? public function moveUp(event : MouseEvent) : void?
??????? {???????????????????
?????????? var i : int = peopleList.selectedIndex;
???????????
????????? if (i >= 1&&peopleList.selectedItem)??
?????????? {???????????????
?????????
???????????? IList(peopleList.dataProvider).addItemAt(peopleList.selectedItem,i-1);
????????????? //Alert.show(peopleList.selectedIndex.toString());????????????????????
???????????? IList(peopleList.dataProvider).removeItemAt(i+1);??
???????????? peopleList.selectedIndex = i;??
???????????????????????? //Alert.show(i.toString());
??????????? }??
??????? }??
??????????
?????? public function moveDown(event : MouseEvent) : void?
??????? {??
??????? var i : int = peopleList.selectedIndex;????????
?????? if (i < (ArrayCollection(peopleList.dataProvider).length - 1) && peopleList.selectedItem)??
??????? {???????????????
?????????? IList(peopleList.dataProvider).addItemAt(peopleList.selectedItem,i + 2);????????????????????
??????????????? IList(peopleList.dataProvider).removeItemAt(i);?????
??????????????? peopleList.selectedIndex = i;??????????????? }??????????????
??????? }??????????????????????
???????? ]]>??
???? </mx:Script>
????? <mx:Array id="arrDP">
??????? <mx:Object c="1" c1="One" />
??????? <mx:Object c="2" c1="One" />
??????? <mx:Object c="3" c1="One" />
</mx:Array>?
???? <mx:VBox horizontalAlign="center" x="618" y="176" height="264">?????
???? <mx:DataGrid id="peopleList"? dataProvider="{arrDP}"? x="198" y="66" width="302">??
?????????
???? </mx:DataGrid>??
???? <mx:ControlBar width="298" autoLayout="true" horizontalAlign="right" height="26">??
???????? <mx:Button label="上移" click="moveUp(event)"/>??
???????? <mx:Button label="下移" click="moveDown(event)"/>??
???? </mx:ControlBar>??????
</mx:VBox>??
</mx:Application>
?
3.DataGrid的数据更换感应
<?xml version="1.0" encoding="utf-8"?>
<mx:Application name="DataGrid_maxVerticalScrollPosition_text"
??????? xmlns:mx="http://www.adobe.com/2006/mxml"
??????? layout="vertical"
??????? verticalAlign="middle"
??????? backgroundColor="white"
??????? creationComplete="init();">
?
??? <mx:Script>
??????? <![CDATA[
??????????? import mx.events.CollectionEvent;
??????????? private var timer:Timer;
?
??????????? private function init():void {
??????????????? timer = new Timer(500);
??????????????? timer.addEventListener(TimerEvent.TIMER, onTimer);
??????????????? timer.start();
??????????? }
?
??????????? private function onTimer(evt:TimerEvent):void {
??????????????? var now:String = new Date().toTimeString();
??????????????? arrColl.addItem({id:timer.currentCount, time:now});
??????????? }
?
??????????? private function arrColl_collectionChange(evt:CollectionEvent):void {
??????????????? callLater(autoScrollDataGrid);
??????????? }
?
??????????? private function autoScrollDataGrid():void {
??????????????? if (dataGrid) {
??????????????????? dataGrid.validateNow();
//validateNow () 方法?
??????????????????? //验证并更新此对象的属性和布局，
??????????????????? //如果需要的话重绘对象。
??????????????????? //通常只有当脚本执行完毕后，
??????????????????? //才会处理要求进行大量计算的处理属性。
??????????????????? //例如，对 width 属性的设置可能会延迟，
??????????????????? //因为此设置需要重新计算这些对象的子项或父项的宽度。
??????????????????? //如果脚本多次设置了 width 属性，则延迟处理可防止进行多次处理。此方法允许您手动覆盖此行为。
??????????????????? dataGrid.verticalScrollPosition=dataGrid.maxVerticalScrollPosition;//滚动条
??????????????? }
??????????? }
??????? ]]>
??? </mx:Script>??
??? <mx:ArrayCollection id="arrColl"
??????????? collectionChange="arrColl_collectionChange(event);" />??
??? <mx:DataGrid id="dataGrid"
??????????? dataProvider="{arrColl}"
??????????? verticalScrollPolicy="on"
??????????? width="200"
??????????? rowCount="8">
??????? <mx:columns>
??????????? <mx:DataGridColumn dataField="id" width="50" />
??????????? <mx:DataGridColumn dataField="time" />
??????? </mx:columns>
??? </mx:DataGrid>
</mx:Application>
