基于行中的数据过滤数据网格，Flex

Question

我今天搜索了所有试图找到如何做到这一点，而不熟悉actionscript开始赶上我。我想完成的是：我有一个Datagrid中的消息列表来自另一个类中的数据提供者，而这个消息从Oracle数据库中获取它们。我需要所有用户在消息上设置可见状态，然后通过单击按钮将其过滤出数据网格。我有隐藏的复选框，并将该值设置到数据库中。当filter参数在行数据中时，我无法弄清楚如何让filterFunction与数组集合一起工作。

下面是代码

public function filterResults():void { 

      modelLocator.notification.messageList.filterFunction = filterRows; 

      modelLocator.notification.messageList.refresh(); 


     } 

     public function filterRows(item:Object):Boolean { 
      //return true if row should stay visible 
      //return false if it should go away 

      var i:int; 

      if(showAll == false) {//checks whether this is coming from the hide or show all button 
      //Somehow need to interrogate the row data to check if messageVisible is set to true or false 

      /* if (showAll == false) { 
       return false; 
      }else { 
       return true; 
      } 
      return false; */ 

     } 
     public var showAll:Boolean; 

     public function showAllMessages():void{ 

      showAll = true; 
      filterResults(); 
     } 
     public function hideMessages():void{ 
      showAll = false; 
      filterResults(); 
     } 


    ]]> 
</mx:Script> 

<mx:VBox> 
    <component:EditMessage id="editMessage" width="930" height="445"/> 
    <mx:Panel id="messageListPanel" title="Message History" layout="vertical" width="930" height="196" horizontalAlign="left"> 

     <mx:DataGrid id="messageDataGrid" dataProvider="{modelLocator.notification.messageList}" 
        width="910" height="139" enabled="true" mouseEnabled="true" editable="false" 
        rowCount="5" itemClick="{selectMessage()}"> 

      <mx:columns> 
       <mx:DataGridColumn headerText="Date Created" labelFunction="formatCreateDate" width="60"/> 
       <mx:DataGridColumn headerText="From" dataField="senderEmail" width="100"/> 
       <mx:DataGridColumn headerText="Subject" dataField="subject" width="100"/> 
       <mx:DataGridColumn headerText="Start Date" labelFunction="formatStartDate" width="60"/> 
       <mx:DataGridColumn headerText="End Date" labelFunction="formatEndDate" width="60" /> 
       <mx:DataGridColumn headerText="Date Sent" labelFunction="formatSendDate" width="60" /> 
       <mx:DataGridColumn headerText="Sender Netid" dataField="senderNetId" width="50" /> 
       <mx:DataGridColumn headerText="Sender Name" dataField="senderName" width="80" /> 
       <mx:DataGridColumn headerText="Message" dataField="message" width="100" /> 
       <mx:DataGridColumn headerText="Message Id" dataField="id" width="10" /> 
      </mx:columns> 
     </mx:DataGrid>    
    </mx:Panel>     
</mx:VBox> 
<mx:Button id="showMessagesBtn" x="786" y="452" label="Show All Messages" click="showAllMessages()"/> 
<mx:Button id="hideMessagesBtn" x="665" y="452" label="Hide Messages" click="hideMessages()" /> 

我发现了一个教程在这里http://franto.com/filter-results-in-datagrid-flex-tutorial/传入的文本这样做，但无法弄清楚上述问题，这真的不能那么难，它可以？

谢谢，

伊恩

Answer 1

项是数据提供器调用该方法在数据提供器和标志用于包括在长度和迭代项的每个元素的一个元素。

 public function filterResults():void { 

      modelLocator.notification.messageList.filterFunction = filterRows; 

      modelLocator.notification.messageList.refresh(); 


     } 

     public function filterRows(item:Object):Boolean { 
      if(showAll) 
       return true; 
      if(item.messageVisible=="true") 
       return true; 
      return false; 
     } 
     public var showAll:Boolean; 

     public function showAllMessages():void{ 

      showAll = true; 
      filterResults(); 
     } 
     public function hideMessages():void{ 
      showAll = false; 
      filterResults(); 
     } 


    ]]> 
</mx:Script> 

<mx:VBox> 
    <component:EditMessage id="editMessage" width="930" height="445"/> 
    <mx:Panel id="messageListPanel" title="Message History" layout="vertical" width="930" height="196" horizontalAlign="left"> 

     <mx:DataGrid id="messageDataGrid" dataProvider="{modelLocator.notification.messageList}" 
        width="910" height="139" enabled="true" mouseEnabled="true" editable="false" 
        rowCount="5" itemClick="{selectMessage()}"> 

      <mx:columns> 
       <mx:DataGridColumn headerText="Date Created" labelFunction="formatCreateDate" width="60"/> 
       <mx:DataGridColumn headerText="From" dataField="senderEmail" width="100"/> 
       <mx:DataGridColumn headerText="Subject" dataField="subject" width="100"/> 
       <mx:DataGridColumn headerText="Start Date" labelFunction="formatStartDate" width="60"/> 
       <mx:DataGridColumn headerText="End Date" labelFunction="formatEndDate" width="60" /> 
       <mx:DataGridColumn headerText="Date Sent" labelFunction="formatSendDate" width="60" /> 
       <mx:DataGridColumn headerText="Sender Netid" dataField="senderNetId" width="50" /> 
       <mx:DataGridColumn headerText="Sender Name" dataField="senderName" width="80" /> 
       <mx:DataGridColumn headerText="Message" dataField="message" width="100" /> 
       <mx:DataGridColumn headerText="Message Id" dataField="id" width="10" /> 
      </mx:columns> 
     </mx:DataGrid>    
    </mx:Panel>     
</mx:VBox> 
<mx:Button id="showMessagesBtn" x="786" y="452" label="Show All Messages" click="showAllMessages()"/> 
<mx:Button id="hideMessagesBtn" x="665" y="452" label="Hide Messages" click="hideMessages()" />