CODEWITHSUNDEEP
actionscript-3apache-flexflex4flash-builderflex4.5
Tahir Alvi
Tahir Alvi

Reputation: 994

Exception of null object reference when click on Text area in popup in Flash Builder 4.6

Here is my code.

<?xml version="1.0" encoding="utf-8"?>


<fx:Script>
    <![CDATA[
        import comps.sampleTextArea;

        import mx.managers.PopUpManager;



        protected function button1_clickHandler(event:MouseEvent):void
        {
            var pop:sampleTextArea = new sampleTextArea();
            PopUpManager.createPopUp(this, sampleTextArea, false);
            PopUpManager.centerPopUp(pop);
        }
    ]]>
</fx:Script>

<fx:Declarations>
    <!-- Place non-visual elements (e.g., services, value objects) here -->
</fx:Declarations>

<s:Button click="button1_clickHandler(event)" label="open popup"/>

and here is code of popup

<?xml version="1.0" encoding="utf-8"?>


<fx:Script>
    <![CDATA[
        import mx.managers.PopUpManager;
        protected function button1_clickHandler(event:MouseEvent):void
        {
            ta.text = '';
            PopUpManager.removePopUp(this);
        }
    ]]>
</fx:Script>

<fx:Declarations>
    <!-- Place non-visual elements (e.g., services, value objects) here -->
</fx:Declarations>
<s:layout>
    <s:VerticalLayout horizontalAlign="center" verticalAlign="top" />
</s:layout>
<s:TextArea id="ta" width="100%" height="90%">

</s:TextArea>
<s:Button label="Submit" click="button1_clickHandler(event)" />

when i click on text area following error through by the application.

TypeError: Error #1009: Cannot access a property or method of a null object reference.
at spark.components::Scroller/focusInHandler()[E:\dev\4.y\frameworks\projects\spark\src\spark\components\Scroller.as:2139]
at flash.display::Stage/set focus()
at flashx.textLayout.container::ContainerController/http://ns.adobe.com/textLayout/internal/2008::setFocus()[C:\Vellum\branches\v2\2.0\dev\output\openSource\textLayout\src\flashx\textLayout\container\ContainerController.as:2265]
at flashx.textLayout.container::ContainerController/mouseDownHandler()[C:\Vellum\branches\v2\2.0\dev\output\openSource\textLayout\src\flashx\textLayout\container\ContainerController.as:2067]
at flashx.textLayout.container::TextContainerManager/mouseDownHandler()[C:\Vellum\branches\v2\2.0\dev\output\openSource\textLayout\src\flashx\textLayout\container\TextContainerManager.as:1939]
at spark.components.supportClasses::RichEditableTextContainerManager/mouseDownHandler()[E:\dev\4.y\frameworks\projects\spark\src\spark\components\supportClasses\RichEditableTextContainerManager.as:666]
at flashx.textLayout.container::ContainerController/http://ns.adobe.com/textLayout/internal/2008::requiredMouseDownHandler()[C:\Vellum\branches\v2\2.0\dev\output\openSource\textLayout\src\flashx\textLayout\container\ContainerController.as:2088]
at flash.events::EventDispatcher/dispatchEventFunction()
at flash.events::EventDispatcher/dispatchEvent()
at mx.core::UIComponent/dispatchEvent()[E:\dev\4.y\frameworks\projects\framework\src\mx\core\UIComponent.as:13152]
at mx.managers::SystemManager/mouseEventHandler()[E:\dev\4.y\frameworks\projects\framework\src\mx\managers\SystemManager.as:2918]

How i handle this issue

Upvotes: 0

Views: 1402

Answers (4)

Tahir Alvi
Tahir Alvi

Reputation: 994

After doing many experiments/ways i conclude that problem is due to the popup component parent container.

I use Group/VGroup/HGroup of spark then this issue remains but if i change the parent container with spark Panel/SkinnableContainer then issue solved.

Try yourself and enjoy.

Upvotes: 0

Tianzhen Lin
Tianzhen Lin

Reputation: 2624

I ran into the same issue, and the root cause was that PopUpManager/PopUpAnchor would not properly set the focusManager if the component being popped up does not implement the IFocusManagerContainer interface. After implementing such interface, the problem goes away.

You may read this blog post that inspired the solution.

Upvotes: 0

Jarno Lahtinen
Jarno Lahtinen

Reputation: 1703

You may not be able to popup a focusable component inside a non-IFocusManagerContainer. If your Group container implements IFocusManagerContainer class, you may use PopUpManager.

<s:Group implements="mx.managers.IFocusManagerContainer"/>

Upvotes: 0

mgraph
mgraph

Reputation: 15338

try, because this refer to stage no the clicked element:

PopUpManager.removePopUp(event.target);

Upvotes: 1

Related Questions