flex – loaderInfo null在creationComplete处理函数中

发布时间：2020-12-15 01:48:49 所属栏目：百科来源：网络整理

导读：我编写了这个小片段,以显示我不理解的内容： ?xml version="1.0" encoding="utf-8"?mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" creationComplete="init()" mx:Script public function init():void { txtName.text = this.

我编写了这个小片段,以显示我不理解的内容：

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" creationComplete="init()">
    <mx:Script>
    public function init():void {
        txtName.text = this.loaderInfo.toString();
    }
    </mx:Script>
    <mx:TextInput x="50" y="10" id="txtName"/>
</mx:Application>

我收到以下错误：

TypeError: Error #1009: Cannot access a property or method of a null object reference.
    at Teste/init()[C:LucasflexAppNamesrcTeste.mxml:5]
    at Teste/___Teste_Application1_creationComplete()[C:UserflexCornetaRecordersrcTeste.mxml:2]
    at flash.events::EventDispatcher/dispatchEventFunction()
    at flash.events::EventDispatcher/dispatchEvent()
    at mx.core::UIComponent/dispatchEvent()[C:autobuild3.2.0frameworksprojectsframeworksrcmxcoreUIComponent.as:9298]
    at mx.core::UIComponent/set initialized()[C:autobuild3.2.0frameworksprojectsframeworksrcmxcoreUIComponent.as:1169]
    at mx.managers::LayoutManager/doPhasedInstantiation()[C:autobuild3.2.0frameworksprojectsframeworksrcmxmanagersLayoutManager.as:718]
    at Function/http://adobe.com/AS3/2006/builtin::apply()
    at mx.core::UIComponent/callLaterDispatcher2()[C:autobuild3.2.0frameworksprojectsframeworksrcmxcoreUIComponent.as:8628]
    at mx.core::UIComponent/callLaterDispatcher()[C:autobuild3.2.0frameworksprojectsframeworksrcmxcoreUIComponent.as:8568]

我不应该能够在creationComplete处理程序中读取loaderInfo吗？我正在尝试将字符串从html传递到我的flash组件,这就是为什么我必须让loaderInfo工作.

解决方法

在FlexEvent.APPLICATION_COMPLETE事件触发之前,loaderInfo对象不可用.尝试将代码更改为：

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" applicationComplete="init()">
    <mx:Script>
    <![CDATA[
        public function init():void {
            txtName.text = this.loaderInfo.toString();
        }
    ]]>
    </mx:Script>
    <mx:TextInput x="50" y="10" id="txtName"/>
</mx:Application>

请注意第2行,creationComplete已更改为applicationComplete.

希望有所帮助！

（编辑：李大同）

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