bruce's sky

今天一个同事问我一个需求，如何点击一个button， 使datagrid按特定的某列排序，于是简单写了个demo：
<?xml version="1.0"?>
<!-- DataGrid control example. -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">

    <mx:Script>
        <![CDATA[
           import mx.collections.XMLListCollection;
           import mx.collections.Sort;
           import mx.collections.SortField;

            private function sortByColumn(sort:Boolean):void
            {
                arrColl.sort = new Sort();
                var f:SortField = new SortField("idx", false, true);
                f.descending = sort;
                arrColl.sort.fields = [f];
                arrColl.refresh();                
            }

            
        ]]>
    </mx:Script>

    <mx:ArrayCollection id="arrColl">
        <mx:source>
            <mx:Array>
                <mx:Object idx="1" c1="One.1" c2="One.2" />
                <mx:Object idx="2" c1="Two.1" c2="Two.2" />
                <mx:Object idx="3" c1="Three.1" c2="Three.2" />
                <mx:Object idx="4" c1="Four.1" c2="Four.2" />
                <mx:Object idx="5" c1="Five.1" c2="Five.2" />
                <mx:Object idx="6" c1="Six.1" c2="Six.2" />
                <mx:Object idx="7" c1="Seven.1" c2="Seven.2" />
                <mx:Object idx="8" c1="Eight.1" c2="Eight.2" />
                <mx:Object idx="9" c1="Nine.1" c2="Nine.2" />
                <mx:Object idx="10" c1="Ten.1" c2="Ten.2" />
                <mx:Object idx="11" c1="Eleven.1" c2="Eleven.2" />
                <mx:Object idx="12" c1="Twelve.1" c2="Twelve.2" />
                <mx:Object idx="13" c1="Thirteen.1" c2="Thirteen.2" />
            </mx:Array>
        </mx:source>
    </mx:ArrayCollection>


    <mx:Panel title="DataGrid Control Example" height="100%" width="100%"
        paddingTop="10" paddingLeft="10" paddingRight="10">

        <mx:Label width="100%" color="blue"
            text="Select a row in the DataGrid control."/>

        <mx:DataGrid id="dg" width="100%" height="100%" rowCount="5" dataProvider="{arrColl}">
            <mx:columns>
                <mx:DataGridColumn dataField="idx" headerText="Name"/>
                <mx:DataGridColumn dataField="c1" headerText="Phone"/>
                <mx:DataGridColumn dataField="c2" headerText="Email"/>
            </mx:columns>
        </mx:DataGrid>
    <mx:CheckBox id="srotChk"/>
        <mx:Button id="sortBtn" label="sort" click="sortByColumn(srotChk.selected)"/>
        
    </mx:Panel>
</mx:Application>     

<?xml version="1.0" encoding="utf-8"?>
<mx:Application
   xmlns:mx="http://www.adobe.com/2006/mxml"
   layout="vertical"
   creationComplete="setDataProvider()">
 
   <mx:Script>
      <![CDATA[
         import mx.collections.XMLListCollection;
        
         [Bindable]
         private var xmlOriginal : XML =
            <root>
               <item name="Alpha" letter="Z"/>
               <item name="Beta" letter="P"/>
               <item name="Gamma" letter="X"/>
               <item name="Delta" letter="P"/>
            </root>
           
         private var xmlUpdated : XML =
            <root>
               <item name="Alpha" letter="F"/>
               <item name="Beta" letter="U"/>
               <item name="Gamma" letter="A"/>
               <item name="Delta" letter="P"/>
               <item name="Epsilon" letter="F"/>
            </root>  
        
         private function setDataProvider() : void
         {
            dataGrid.dataProvider = new XMLListCollection( xmlOriginal..item );
         }
        
      ]]>
   </mx:Script>
 
   <mx:DataGrid
      id="dataGrid"/>
 
   <mx:Button
      label="Simulate Update"
      click="XMLListCollection( dataGrid.dataProvider ).source = xmlUpdated..item"/>
 
</mx:Application>

简单替换