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POWhy this TLFTextField code works only once?
 

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    <p>I need the text in an input TLF text field to be modified when the user changes it. As for example, I'm trying to make it uppercase every time the user adds or deletes a character:</p> <pre><code>import fl.text.TLFTextField; import flashx.textLayout.formats.TextLayoutFormat; import flashx.textLayout.elements.TextFlow; var myTLFTextField:TLFTextField = new TLFTextField(); addChild(myTLFTextField); myTLFTextField.x = 10; myTLFTextField.y = 10; myTLFTextField.width = 200 myTLFTextField.height = 100; myTLFTextField.text = "This is my text"; var myFormat:TextLayoutFormat = new TextLayoutFormat(); myFormat.textIndent = 8; myFormat.color = 0x336633; myFormat.fontFamily = "Arial, Helvetica, _sans"; myFormat.fontSize = 24; var myTextFlow:TextFlow = myTLFTextField.textFlow; myTextFlow.hostFormat = myFormat; myTextFlow.flowComposer.updateAllControllers(); //-- myTLFTextField.addEventListener(Event.CHANGE, this.onTextFieldChange); function onTextFieldChange(event:Event):void { myTLFTextField.text = myTLFTextField.text.toUpperCase(); } </code></pre> <p>The code that goes before <code>//--</code> is taken from the <a href="http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/fl/text/TLFTextField.html" rel="nofollow">TLFTextField documentation</a>, the very first example on the page.</p> <p>When I try to edit the text, it does become uppercase, but after that the text field stops responding to any input and the output says</p> <blockquote> <p>TypeError: Error #1009: Cannot access a property or method of a null object reference. at flashx.textLayout.container::TextContainerManager/getController() at flashx.textLayout.container::TextContainerManager/mouseDownHandler()</p> </blockquote> <p>When I comment out the <code>addEventListener</code> line, all appears to be working fine.</p> <p>Does it mean that it's not possible to make changes to the text in a TLF text field on user input event like it is possible with the classic text fields?</p>
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    1. COCould be an infinite loop. Try checking if the case actually needs to be changed in your callback; `if( myTLFTextField.text.toUpperCase() != myTLFTextField.text )`
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    2. CO@Dave Well my question is not about uppercase (there's a built-in feature to keep text uppercase anyways) but more about making changes to the text on user input events. If you try making changes in some other way, like adding a letter "A" to the text's end instead of making it uppercase, you run into the same kind of problem.
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    3. COwell ok but my point still stands; it could be that by changing the text you trigger the callback, which changes the text, which (...). I'm not *sure* that's the problem, but you can check by breaking that loop. If it turns out it is the problem, you can try to change the event you listen to or use a variable marker (set to `true` if already in the callback, for example).
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