Adobe Flex错误类型错误：错误＃1009：无法访问空对象引用的属性或方法

我试图将搜索字段添加到Adobe Flex项目，并且当您在新创建的搜索字段中输入时，以下错误：Adobe Flex错误类型错误：错误＃1009：无法访问空对象引用的属性或方法

TypeError: Error #1009: Cannot access a property or method of a null object reference. 
    at flextest/filterDecalMyArrayCollection() 
    at mx.collections::ListCollectionView/internalRefresh() 
    at mx.collections::ListCollectionView/refresh() 
    at flextest/filterDecal() 
    at flextest/__searchDecal_change() 
    at flash.events::EventDispatcher/dispatchEventFunction() 
    at flash.events::EventDispatcher/dispatchEvent() 
    at mx.core::UIComponent/dispatchEvent() 
    at mx.controls::TextInput/textField_changeHandler()

任何帮助将不胜感激！

下面是我的代码从Flex项目：

<?xml version="1.0" encoding="utf-8"?> 
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" 
       initialize="doSend()" 
       layout="absolute" width="1092" height="834"> 
    <mx:Style source="flextest.css"/> 
    <mx:Script> 
     <![CDATA[ 
      import mx.collections.ArrayCollection; 
      import mx.events.ListEvent; 
      import mx.rpc.events.FaultEvent; 
      import mx.rpc.events.ResultEvent; 
      import mx.rpc.http.HTTPService; 

      [Bindable] 
      private var datalist:ArrayCollection; 
      private var rowcount; 
      private var firstTimeID:Boolean = true; 
      private var firstTimeName:Boolean = true; 
      private var firstTimeDL:Boolean = true; 
      private var firstTimeDecal:Boolean = true; 
      private var firstTimeTag:Boolean = true; 

      private function resultHandler(event:ResultEvent):void{     
       datalist = event.result.data.row; 
       rowcount = event.result.data.numrows; 
       /* if(rowcount == '1'){ 
       datalist.removeItemAt(1); */ 
      } 
      public function doSend():void { 
       xmlFromDatabase.url = "http://webprod.jsu.edu/pd/guestxml.php?t=" + new Date().getTime(); 
       xmlFromDatabase.send(); 

      } 
      private function onItemClick(e:ListEvent):void { 
       var dlAdjust; 

       txtTuid.text = e.itemRenderer.data.TUID; 
       txtStudentName.text = e.itemRenderer.data.STUDENTNAME; 
       txtDecalYear.text = e.itemRenderer.data.DECALYEAR; 
       txtDecalType.text = e.itemRenderer.data.DECALTYPE; 
       txtConfNo.text = e.itemRenderer.data.DECALNUMBER; 
       txtDecNo.text = e.itemRenderer.data.DECALNUMPERM; 
       if (e.itemRenderer.data.DECALCAT == "WHIT") { 
        cmbCategory.selectedIndex = 0; 
       } else { 
        cmbCategory.selectedIndex = -1; 
       } 
       txtOriginalDate.text = e.itemRenderer.data.ORIGDATE; 
       txtUpdateDate.text = e.itemRenderer.data.UPDTDATE; 
       txtNote.text = e.itemRenderer.data.DECALNOTES; 
       dlAdjust = e.itemRenderer.data.DLNUM; 
       txtDLic.text = dlAdjust.slice(0, dlAdjust.length - 2); 
       txtDLState.text = e.itemRenderer.data.DLSTATE; 
       txtVMake.text = e.itemRenderer.data.VMAKE; 
       txtVModel.text = e.itemRenderer.data.VMODEL; 
       txtVBody.text = e.itemRenderer.data.VBODY; 
       txtVColor.text = e.itemRenderer.data.VCOLOR; 
       txtVTag.text = e.itemRenderer.data.VTAG; 
       txtVState.text = e.itemRenderer.data.VSTATE; 
       txtVYear.text = e.itemRenderer.data.VYEAR; 
       txtVCounty.text = e.itemRenderer.data.VCOUNTY; 
       txtVIns.text = e.itemRenderer.data.VINS; 
       if (e.itemRenderer.data.VPMT == "A") { 
        cmbPayment.selectedIndex = 0; 
       } else if (e.itemRenderer.data.VPMT == "T"){ 
        cmbPayment.selectedIndex = 1; 
       } else { 
        cmbPayment.selectedIndex = -1; 
       } 
       txtPhone.text = e.itemRenderer.data.PHONE; 
       if (e.itemRenderer.data.DECALVOIDED == "V") { 
        chkVoid.selected = true; 
        lblVoidValue.label = "Void"; 
       } else { 
        chkVoid.selected = false; 
        lblVoidValue.label = null; 
       } 
       if (e.itemRenderer.data.ADDITIONAL == "A") { 
        chkAdditional.selected = true; 
        lblAdditional.label = "Additional"; 
       } else { 
        chkAdditional.selected = false; 
        lblAdditional.label = null; 

       } 
      } 


      public function handleResult(event:ResultEvent):void { 
       /*var urlRequest:URLRequest = new URLRequest('http://webprod.jsu.edu/pd-test/admin/flextest.html'); 
       navigateToURL(urlRequest,"_self");*/     
      } 
      public function handleFault(event:FaultEvent):void { 
      } 


      private function filterTag():void { 
      datalist.filterFunction = filterTagMyArrayCollection; 
      datalist.refresh(); 
      }   
      private function filterTagMyArrayCollection(item:Object):Boolean { 
      var searchString:String = searchTag.text.toLowerCase(); 
      var itemName:String = (item.VTAG as String).toLowerCase(); 
      return itemName.indexOf(searchString) > -1; 
      } 
      private function filterDL():void { 
      datalist.filterFunction = filterDLMyArrayCollection; 
      datalist.refresh(); 
      }   
      private function filterDLMyArrayCollection(item:Object):Boolean { 
      var searchString:String = searchDL.text; 
      var itemName:String = (item.DLNUM as String); 
      return itemName.indexOf(searchString) > -1; 
      } 

      private function filterDecal():void { 
       datalist.filterFunction = filterDecalMyArrayCollection; 
       datalist.refresh(); 
      } 

      private function filterDecalMyArrayCollection(item:Object):Boolean { 
       var searchString:String = searchDecal.text; 
       var itemName:String = (item.DECALNUMPERM as String); 
       return itemName.indexOf(searchString) > -1; 
      } 

      /*private function filterID():void { 
       datalist.filterFunction = filterIDMyArrayCollection; 
       datalist.refresh(); 
      }   
      private function filterIDMyArrayCollection(item:Object):Boolean { 
       var searchString:String = searchID.text.toLowerCase(); 
       var itemName:String = (item.STUDENTPIDM as String).toLowerCase(); 
       return itemName.indexOf(searchString) > -1; 
      }  */  
      private function filterName():void { 
       datalist.filterFunction = filterNameMyArrayCollection; 
       datalist.refresh(); 
      }   
      private function filterNameMyArrayCollection(item:Object):Boolean { 
       var searchString:String = searchName.text.toLowerCase(); 
       var itemName:String = (item.STUDENTNAME as String).toLowerCase(); 
       return itemName.indexOf(searchString) > -1; 
      }   

      private function clearNameTextInput():void {     
       if (firstTimeName == true) 
       { 
        searchName.text = ""; 
        firstTimeName = false; 
       } 
      } 


      /* 
      private function clearIDTextInput():void {    
      if (firstTimeID == true) 
      { 
      searchID.text = ""; 
      firstTimeID = false; 
      } 
      }  */  
      private function clearDLTextInput():void {    
      if (firstTimeDL == true) 
      { 
      searchDL.text = ""; 
      firstTimeDL = false; 
      } 
      }   
      private function clearTagTextInput():void {    
      if (firstTimeTag == true) 
      { 
      searchTag.text = ""; 
      firstTimeTag = false; 
      } 
      } 

      private function clearDecalTextInput():void {    
       if (firstTimeDecal == true) 
       { 
        searchDecal.text = ""; 
        firstTimeDecal = false; 
       } 
      } 


      protected function button1_clickHandler(event:MouseEvent):void 
      { 
       //What happens when we click the refresh button 
       var urlRequest:URLRequest = new URLRequest('http://webprod.jsu.edu/pd-test/guest/whiteadmin.php'); 
       navigateToURL(urlRequest,"_self"); 
      } 
      protected function btnSave_clickHandler(event:MouseEvent):void 
      { 
       //What happens when we click the save button 
       form1.send();    
      } 
      protected function chkVoid_clickHandler(event:MouseEvent):void 
      { 
       //What happens when we click Void Checkbox 
       if (chkVoid.selected.valueOf() == true) { 
        lblVoidValue.label = "Void"; 
       } else { 
        lblVoidValue.label = null; 
       } 
      } 
      protected function chkAdditional_clickHandler(event:MouseEvent):void 
      { 
       // What happens when we click Additional Checkbox 
       if (chkAdditional.selected.valueOf() == true) { 
        lblAdditional.label = "Additional"; 
       } else { 
        lblAdditional.label = null; 
       } 
      } 




      protected function button3_clickHandler(event:MouseEvent):void 
      { 
       //What happens when we click the register white button 
       var urlRequest:URLRequest = new URLRequest('http://webprod.jsu.edu/pd-test/registerwhite.php'); 
       navigateToURL(urlRequest,"_self"); 
      } 

      protected function button4_clickHandler(event:MouseEvent):void 
      { 
       // TODO Auto-generated method stub 
       var urlRequest:URLRequest = new URLRequest('http://webprod.jsu.edu/pd-test/admin/dispatch.php'); 
       navigateToURL(urlRequest,"_self"); 
      } 

      protected function dg_changeHandler(event:ListEvent):void 
      { 
       // TODO Auto-generated method stub 
      } 
     ]]> 
    </mx:Script> 


    <!-- Service Calls --> 
    <mx:HTTPService url="http://webprod.jsu.edu/pd-test/guestxml.php" 
        id="xmlFromDatabase" 
        showBusyCursor="true" 
        result="resultHandler(event)"     
        method="POST" > 
    </mx:HTTPService> 

    <mx:HTTPService id="form1" 
        url="http://webprod.jsu.edu/pd-test/guestupdate.php"      
        method="POST" 
        result="handleResult(event)" 
        resultFormat="text" > 
     <mx:request> 
      <txtTuid> 
       {txtTuid.text} 
      </txtTuid> 
      <txtStudentName> 
       {txtStudentName.text} 
      </txtStudentName> 
      <txtDecalYear> 
       {txtDecalYear.text} 
      </txtDecalYear> 
      <txtDecalType> 
       {txtDecalType.text} 
      </txtDecalType> 
      <txtConfNo> 
       {txtConfNo.text} 
      </txtConfNo> 
      <txtDecNo> 
       {txtDecNo.text} 
      </txtDecNo> 
      <txtCategory> 
       {cmbCategory.selectedItem.data} 
      </txtCategory> 
      <dateOrigDate> 
       {txtOriginalDate.text} 
      </dateOrigDate> 
      <txtNote> 
       {txtNote.text} 
      </txtNote> 
      <txtDLic> 
       {txtDLic.text} 
      </txtDLic> 
      <txtDLState> 
       {txtDLState.text} 
      </txtDLState> 
      <txtVMake> 
       {txtVMake.text} 
      </txtVMake> 
      <txtVModel> 
       {txtVModel.text} 
      </txtVModel> 
      <txtVBody> 
       {txtVBody.text} 
      </txtVBody> 
      <txtVColor> 
       {txtVColor.text} 
      </txtVColor> 
      <txtVTag> 
       {txtVTag.text} 
      </txtVTag> 
      <txtVState> 
       {txtVState.text} 
      </txtVState> 
      <txtVYear> 
       {txtVYear.text} 
      </txtVYear> 
      <txtVCounty> 
       {txtVCounty.text} 
      </txtVCounty> 
      <txtVIns> 
       {txtVIns.text} 
      </txtVIns> 
      <txtVPmt> 
       {cmbPayment.selectedItem.data} 
      </txtVPmt> 
      <txtPhone> 
       {txtPhone.text} 
      </txtPhone> 
      <lblVoidValue> 
       {lblVoidValue.label} 
      </lblVoidValue> 
      <lblAdditional> 
       {lblAdditional.label} 
      </lblAdditional> 
     </mx:request> 
    </mx:HTTPService> 

    <mx:Label x="6" y="4" text="White Decal Dispatch" fontWeight="bold" color="#CC3333" fontSize="30"/> 

    <mx:DataGrid x="10" y="53" dataProvider="{datalist}" id="dg" itemClick="onItemClick(event);" height="255" width="1009" change="dg_changeHandler(event)"> 
     <mx:columns> 
      <!--<mx:DataGridColumn width="50" headerText="uid" dataField="TUID"/>--> 
      <mx:DataGridColumn width="30" headerText="Year" dataField="DECALYEAR"/> 
      <mx:DataGridColumn width="80" headerText="Name" dataField="STUDENTNAME"/> 
      <mx:DataGridColumn width="23" headerText="Conf #." dataField="DECALNUMBER"/> 
      <mx:DataGridColumn width="23" headerText="Decal #" dataField="DECALNUMPERM"/> 
      <mx:DataGridColumn width="10" headerText="Typ" dataField="DECALTYPE"/> 
      <mx:DataGridColumn width="20" headerText="Cat" dataField="DECALCAT"/> 
      <mx:DataGridColumn width="30" headerText="dlnum" dataField="DLNUM"/> 
      <mx:DataGridColumn width="12" headerText="dlstate" dataField="DLSTATE"/> 
      <mx:DataGridColumn width="20" headerText="Make" dataField="VMAKE"/> 
      <mx:DataGridColumn width="30" headerText="Model" dataField="VMODEL"/> 
      <mx:DataGridColumn width="12" headerText="Body" dataField="VBODY"/> 
      <mx:DataGridColumn width="15" headerText="Year" dataField="VYEAR"/> 
      <mx:DataGridColumn width="10" headerText="Color" dataField="VCOLOR"/> 
      <mx:DataGridColumn width="30" headerText="Tag" dataField="VTAG"/> 
      <mx:DataGridColumn width="12" headerText="State" dataField="VSTATE"/> 
      <mx:DataGridColumn width="30" headerText="County" dataField="VCOUNTY"/><!-- 
      <mx:DataGridColumn width="50" headerText="Ins" dataField="VINS"/> 
      <mx:DataGridColumn width="20" headerText="Pmt" dataField="VPMT"/>--> 
      <mx:DataGridColumn width="5" headerText="Rec" dataField="DECALPICKEDUP"/> 
      <!--<mx:DataGridColumn width="20" headerText="decalvoided" dataField="DECALVOIDED"/> 
      <mx:DataGridColumn width="50" headerText="origdate" dataField="ORIGDATE"/> 
      <mx:DataGridColumn width="50" headerText="updtdate" dataField="UPDTDATE"/> 
      <mx:DataGridColumn width="20" headerText="charged" dataField="CHARGED"/> 
      <mx:DataGridColumn width="50" headerText="chargedate" dataField="CHARGEDATE"/> 
      <mx:DataGridColumn width="50" headerText="decalnotes" dataField="DECALNOTES"/>--> 
     </mx:columns> 
    </mx:DataGrid> 
    <mx:Form id= "frmUpdateDecal" x="710" y="336" width="309" height="363"> 
     <mx:FormItem label="DLic#"> 
      <mx:TextInput id="txtDLic" maxChars="20"/> 
     </mx:FormItem> 
     <mx:FormItem label="DLic State:"> 
      <mx:TextInput id="txtDLState" maxChars="2"/> 
     </mx:FormItem> 
     <mx:FormItem label="Vehicle Make:"> 
      <mx:TextInput id="txtVMake" maxChars="4"/> 
     </mx:FormItem> 
     <mx:FormItem label="Vehicle Model:"> 
      <mx:TextInput id="txtVModel" maxChars="20"/> 
     </mx:FormItem> 
     <mx:FormItem label="Vehicle Body:"> 
      <mx:TextInput id="txtVBody" maxChars="4"/> 
     </mx:FormItem> 
     <mx:FormItem label="Vehicle Color:"> 
      <mx:TextInput id="txtVColor" maxChars="3"/> 
     </mx:FormItem> 
     <mx:FormItem label="Vehicle Tag:"> 
      <mx:TextInput id="txtVTag" maxChars="20"/> 
     </mx:FormItem> 
     <mx:FormItem label="Tag State:"> 
      <mx:TextInput id="txtVState" maxChars="2"/> 
     </mx:FormItem> 
     <mx:FormItem label="Vehicle Year:"> 
      <mx:TextInput id="txtVYear" maxChars="4"/> 
     </mx:FormItem> 
     <mx:FormItem label="Tag County:"> 
      <mx:TextInput id="txtVCounty" maxChars="20"/> 
     </mx:FormItem> 
     <mx:FormItem label="Insurance:"> 
      <mx:TextInput id="txtVIns" maxChars="50"/> 
     </mx:FormItem> 
     <mx:FormItem label="Phone:"> 
      <mx:TextInput id="txtPhone" maxChars="11"/> 
     </mx:FormItem> 
    </mx:Form> 
    <mx:Button x="539" y="725" label="Refresh" width="156" click="button1_clickHandler(event)"/> 
    <mx:Button x="710" y="17" label="Add White Decal" width="117" click="button3_clickHandler(event)"/> 
    <mx:ApplicationControlBar x="10" y="365" width="261" height="334"> 
     <mx:Form height="268" width="236" y="25">   
      <mx:FormItem> 
       <mx:Label text="Name:" color="#CC3333" fontWeight="bold" fontStyle="italic" textDecoration="underline"/> 
      </mx:FormItem> 
      <mx:TextInput id="searchName" change="filterName()" 
          enabled="true" 
          focusIn="clearNameTextInput()" 
          text="Filter/Search Name" 
          width="202" height="26" color="#2B4381"/>   
      <mx:FormItem> 
       <mx:Label text="Tag:" color="#CC3333" fontWeight="bold" fontStyle="italic" textDecoration="underline"/> 
      </mx:FormItem> 
      <!-- 
      <mx:TextInput id="searchID" change="filterID()" 
      enabled="true" 
      focusIn="clearIDTextInput()" 
      text="Filter/Search JSU ID" 
      width="204" height="26" color="#2B4381"/> -->  

      <mx:TextInput id="searchTag" change="filterTag()" 
      enabled="true" 
      focusIn="clearTagTextInput()" 
      text="Filter/Search Tag" 
      width="201" height="26" color="#2B4381"/> 




      <mx:FormItem> 
       <mx:Label text="Driver's License:" color="#CC3333" fontWeight="bold" fontStyle="italic" textDecoration="underline"/> 
      </mx:FormItem> 
      <mx:TextInput id="searchDL" change="filterDL()" 
      enabled="true" 
      focusIn="clearDLTextInput()" 
      text="Filter/Search Driver's License" 
      width="200" height="26" color="#2B4381"/> 

      <mx:FormItem> 
       <mx:Label text="Decal Number:" color="#CC3333" fontWeight="bold" fontStyle="italic" textDecoration="underline"/> 
      </mx:FormItem> 

      <mx:TextInput id="searchDecal" change="filterDecal()" 
          enabled="true" 
          focusIn="clearDecalTextInput()" 
          text="Filter/Search Decal Number" 
          width="200" height="26" color="#2B4381"/> 

     </mx:Form> 

    </mx:ApplicationControlBar> 
    <mx:FormItem label="Confirmation No:" x="299" y="403" width="219" fontStyle="italic"> 
     <mx:TextInput id="txtConfNo" width="119" editable="false" contentBackgroundAlpha="1.0" dropShadowVisible="false" borderVisible="false" color="#CC3333" maxChars="5"/> 
    </mx:FormItem> 
    <mx:FormItem label="System Tranaction ID:" x="276" y="426" width="240" fontStyle="italic"> 
     <mx:TextInput id="txtTuid" width="118" editable="false" borderVisible="false" color="#CC3333"/> 
    </mx:FormItem> 
    <mx:Label x="16" y="325" text="Search" fontWeight="bold" color="#CC3333" fontSize="22"/> 
    <mx:FormItem label="Justification/Notes:" x="294" y="586"> 
     <mx:TextArea id="txtNote" width="292" height="85"/> 
    </mx:FormItem> 
    <mx:FormItem label="Decal#:" x="571" y="477" width="121"> 
     <mx:TextInput id="txtDecNo" width="65" maxChars="5"/> 
    </mx:FormItem> 
    <mx:FormItem label="Category" x="489" y="507"> 
     <mx:ComboBox id="cmbCategory" 
        prompt="Select Decal Category" 
        selectedIndex="-1"> 
      <mx:dataProvider> 
       <mx:Object label="White" data="WHIT" /> 
      </mx:dataProvider> 
     </mx:ComboBox> 

    </mx:FormItem> 
    <mx:FormItem label="Payment Type" x="445" y="535"> 
     <mx:ComboBox id="cmbPayment" 
        prompt="Select Payment Type" 
        selectedIndex="-1" width="160"> 
      <mx:dataProvider> 
       <mx:Object label="Payment Upon Request" data="A" /> 
       <mx:Object label="Tag or 25yrs service FREE" data="T" /> 
      </mx:dataProvider> 
     </mx:ComboBox> 
    </mx:FormItem> 
    <mx:FormItem id="lblAdditional" color="#2FAB5E" x="525" y="561"> 
     <mx:CheckBox label="$1.00 Additional" fontStyle="italic" color="#2F3F81" id="chkAdditional" click="chkAdditional_clickHandler(event)"/> 
    </mx:FormItem> 
    <mx:FormItem label="" id="lblVoidValue" color="#D21703" fontSize="13" fontFamily="Verdana" fontWeight="bold" fontStyle="normal" x="410" y="687"> 
     <mx:CheckBox label="Void" id="chkVoid" click="chkVoid_clickHandler(event)" color="#2F3F81" fontSize="10" fontFamily="Arial" fontStyle="italic"/> 
    </mx:FormItem> 
    <mx:FormItem label="Order Date:" x="509" y="415" width="62"> 
    </mx:FormItem> 
    <mx:FormItem label="Pick-up Date:" x="501" y="448" width="72"> 
    </mx:FormItem> 
    <mx:FormItem label="Dec Year:" x="310" y="448" fontStyle="italic"> 
     <mx:TextInput id="txtDecalYear" width="79" borderVisible="false" color="#CC3333"/> 
    </mx:FormItem> 
    <mx:FormItem label="Guest Name" x="460" y="371"> 
     <mx:TextInput id="txtStudentName" width="152" maxChars="100"/> 
    </mx:FormItem> 
    <mx:Button label="Save" width="156" id="btnSave" click="btnSave_clickHandler(event)" x="539" y="685"/> 
    <mx:FormItem label="Decal Type:" x="458" y="477" width="103"> 
     <mx:TextInput id="txtDecalType" width="26"/> 
    </mx:FormItem> 
    <mx:Label x="297" y="324" text="Decal Info" fontWeight="bold" color="#CC3333" fontSize="22"/> 
    <mx:TextInput x="571" y="413" width="119" id="txtOriginalDate" maxChars="50"/> 
    <mx:TextInput x="571" y="446" width="119" id="txtUpdateDate" maxChars="50"/> 
    <mx:Button x="850" y="17" label="Return to Decal Dispatch" width="173" click="button4_clickHandler(event)"/> 

</mx:Application>

来源

2011-06-28 Chris Cheatwood

什么是文本字段的名称你'是指？ –

哦，亲爱的，这是痛苦的通读。你应该真的尝试清理。

正如错误说，这是造成这一问题的功能是这样的：

private function filterDecalMyArrayCollection(item:Object):Boolean { 
    var searchString:String = searchDecal.text; 
    var itemName:String = (item.DECALNUMPERM as String); 
    return itemName.indexOf(searchString) > -1; 
}

当DECALNUMPERM属性为null，再次，作为错误提到这可能会失败。你有没有试过调试过？

来源

2011-06-28 20:37:33

这是我第一次使用Flex。我没有使用Flex进行零培训。 DECALNUMPERM上的这个搜索功能在另一个Flex项目上，我复制了所有的代码。它在另一个项目上工作正常..只是不知道为什么它不会在这里工作。 –

我进去编辑了从数据库加载数据的php文件，并且我将DECALNUMPERM的任何空值更改为0. –

对不起，我的坏。我改变了它，然后改回来了。通过将'as string'固定为'.toString（）'并用零填充空值，我可以使这个工作。非常感谢！！ –

改变这一行：

var itemName:String = (item.DECALNUMPERM as String);

到

返回item.DECALNUMPERM & & item.DECALNUMPERM.toString（）的indexOf（searchString的）> -1;

item.DECALNUMPERM是一个数字，将其转换为String将导致null。

顺便说一句：除了其他的东西，我会把这个文件分成几个。 500行文件通常不是调试的好主意。

是否有你使用Flex 3而不是Flex 4的原因？

编辑此外，有时item.DECALNUMPERM为空。因此，您需要检查null以及执行toString（）。试试这个行：

return item.DECALNUMPERM && item.DECALNUMPERM.toString().indexOf(searchString) > -1;

您还需要作出其他地方，如改变：

private function filterTagMyArrayCollection(item:Object):Boolean { 
var searchString:String = searchTag.text.toLowerCase(); 
var itemName:String = (item.VTAG as String).toLowerCase(); 
return itemName.indexOf(searchString) > -1; 
}

和

private function filterDLMyArrayCollection(item:Object):Boolean { 
var searchString:String = searchDL.text; 
var itemName:String = (item.DLNUM as String); 
return itemName.indexOf(searchString) > -1; 
}

来源

2011-06-28 20:42:19

除了可读性/维护之外，是否有任何理由将文件保存在500行以下？我知道我有一些容易超过1000行的组件。 –

@Jason - 你懂了，可读性和维护。这些都是很好的理由。 –

我从离开我们部门的人那里继承了这一点，这是我第一次使用Adobe Flex。我正在使用Flash Builder 4，所以我不确定它为什么将它显示为版本3. –

Adob​​e Flex错误类型错误：错误＃1009：无法访问空对象引用的属性或方法

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Adobe Flex错误类型错误：错误＃1009：无法访问空对象引用的属性或方法