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POUpgrading from Flex 3.0 to Flex 3.6 - Custom Combobox getting TypeError in super.commitProperties()
 

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  1. POUpgrading from Flex 3.0 to Flex 3.6 - Custom Combobox getting TypeError in super.commitProperties()
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    <p>I am working on upgrading Flex 3.0 application to Flex 3.6 SDK. The application has custom controls for input text, combo-boxes, etc. When I click on the combo-box I get exception when super.commitProperties() is called. This works fine with Flex 3.0 SDK.</p> <pre><code>TypeError: Error #1009: Cannot access a property or method of a null object reference. at mx.controls::ComboBox/destroyDropdown()[C:\autobuild\3.x\frameworks\projects\framework\src\mx\controls\ComboBox.as:1681] at mx.controls::ComboBox/styleChanged()[C:\autobuild\3.x\frameworks\projects\framework\src\mx\controls\ComboBox.as:1177] at mx.core::UIComponent/setBorderColorForErrorString()[C:\autobuild\3.x\frameworks\projects\framework\src\mx\core\UIComponent.as:5048] at mx.core::UIComponent/commitProperties()[C:\autobuild\3.x\frameworks\projects\framework\src\mx\core\UIComponent.as:6033] at mx.controls::ComboBase/commitProperties()[C:\autobuild\3.x\frameworks\projects\framework\src\mx\controls\ComboBase.as:993] at mx.controls::ComboBox/commitProperties()[C:\autobuild\3.x\frameworks\projects\framework\src\mx\controls\ComboBox.as:1291] at com.hanover.utility.controls.autotestcontrols::AutotestComboBox/commitProperties()[C:\App\Control\PLCustomComboBox.as:59] at mx.core::UIComponent/validateProperties()[C:\autobuild\3.x\frameworks\projects\framework\src\mx\core\UIComponent.as:5966] at mx.managers::LayoutManager/validateProperties()[C:\autobuild\3.x\frameworks\projects\framework\src\mx\managers\LayoutManager.as:539] at mx.managers::LayoutManager/doPhasedInstantiation()[C:\autobuild\3.x\frameworks\projects\framework\src\mx\managers\LayoutManager.as:689] at mx.managers::LayoutManager/validateNow()[C:\autobuild\3.x\frameworks\projects\framework\src\mx\managers\LayoutManager.as:748] at mx.controls::ComboBox/displayDropdown()[C:\autobuild\3.x\frameworks\projects\framework\src\mx\controls\ComboBox.as:1638] at mx.controls::ComboBox/downArrowButton_buttonDownHandler()[C:\autobuild\3.x\frameworks\projects\framework\src\mx\controls\ComboBox.as:1796] at flash.events::EventDispatcher/dispatchEventFunction() at flash.events::EventDispatcher/dispatchEvent() at mx.core::UIComponent/dispatchEvent()[C:\autobuild\3.x\frameworks\projects\framework\src\mx\core\UIComponent.as:9590] at mx.controls::Button/http://www.adobe.com/2006/flex/mx/internal::buttonPressed()[C:\autobuild\3.x\frameworks\projects\framework\src\mx\controls\Button.as:2504] at mx.controls::Button/mouseDownHandler()[C:\autobuild\3.x\frameworks\projects\framework\src\mx\controls\Button.as:2750] at flash.events::EventDispatcher/dispatchEventFunction() at flash.events::EventDispatcher/dispatchEvent() at mx.core::UIComponent/dispatchEvent()[C:\autobuild\3.x\frameworks\projects\framework\src\mx\core\UIComponent.as:9590] at mx.controls::ComboBase/textInput_mouseEventHandler()[C:\autobuild\3.x\frameworks\projects\framework\src\mx\controls\ComboBase.as:1384] </code></pre> <p>PLCustomCombobox.as pseudo-source with line # 59 indicated below</p> <pre><code>package com { import com.name.utility.events.PLControlEvent; import com.name.utility.managers.ComboToolTipManager; import flash.events.Event; import mx.controls.ComboBox; import mx.events.FlexEvent; [Event(name="controlInitComplete", type="com.events.PLControlEvent")] [Event(name="plusControlValueChanged", type="com.name.utility.events.PLControlEvent")] public class PLControlComboBox extends ComboBox implements IPLControlControl { /** * A flag that indicates whether the control need to refresh. */ protected var isNeedRefresh:Boolean = false; /** * A flag that indicates whether the value of control is changed. */ protected var isValueChanged:Boolean = false; /** * Constructor. */ public function PLControlComboBox() { super(); this.addEventListener(FlexEvent.CREATION_COMPLETE, onCreationComplete); } /** * @private * override commitProperties for avoid dispatch event many times. */ override protected function commitProperties():void { super.commitProperties(); // &lt;---- line # 59 is here if(isNeedRefresh) { this.dispatchEvent(new PLControlEvent(PLControlEvent.VALUE_CHANGED)); isNeedRefresh = false; } if(isValueChanged) { this.dispatchEvent(new Event("PLControlComboboxChanged")); isValueChanged = false; } } /** * Add item's tooltip. * @private */ override public function set measuredWidth(value:Number):void { super.measuredWidth = value; if(collection &amp;&amp; collection.length &gt; 0) { ComboToolTipManager.showItemToolTip(this); } } protected function onCreationComplete(event:FlexEvent):void { this.removeEventListener(FlexEvent.CREATION_COMPLETE, onCreationComplete); this.dispatchEvent(new PLControlEvent(PLControlEvent.INIT_COMPLETE)); } public function checkValidity():void { if(_required &amp;&amp; dataProvider &amp;&amp; dataProvider.length &gt; 0 &amp;&amp; _defaultItemIndex == selectedIndex) { _validity = false; errorString = "please select one"; } else { _validity = true; errorString = ""; } } // ====================================== // public function // ====================================== private function itemChanged():void { isNeedRefresh = true; isValueChanged = true; checkValidity(); } // ====================================== // properties // ====================================== private var _required:Boolean = false; private var _validity:Boolean = false; private var _defaultItemIndex:int = 0; public function get required():Boolean { return _required; } [Inspectable(defaultValue=false, category="Other")] public function set required(value:Boolean):void { _required = value; isNeedRefresh = true; checkValidity(); } [Bindable("PLControlComboboxChanged")] public function get controlValue():Object { return this.selectedIndex; } public function set controlValue(value:Object):void { if(value is Number) { this.selectedIndex = int(value); itemChanged(); } } /** * @copy IPLControlControl#validity */ public function get validity():Boolean { return _validity; } /** * @copy IPLControlControl#type */ public function get type():String { return PLControlTypeList.CONTROL_TYPE_COMBOBOX; } /** * If required is true, the default Item can not be selected. */ public function get defaultItemIndex():int { return _defaultItemIndex; } [Inspectable(defaultValue=0, type="Number", category="Other")] public function set defaultItemIndex(index:int):void { _defaultItemIndex = index; isNeedRefresh = true; checkValidity(); } /** * Override for check validity. */ override public function set selectedIndex(value:int):void { super.selectedIndex = value; itemChanged(); } /** * Override for check validity. */ override public function set selectedItem(value:Object):void { super.selectedItem = value; itemChanged(); } } } </code></pre> <p>Its coming from mx.controls.Comboxbox line # 1681 because tween is null.</p> <pre><code>private function destroyDropdown():void { if (inTween) tween.endTween();//&lt;---- exception on this line displayDropdown(false, null, false); } </code></pre> <p>Any suggestions of why this could be happening?</p>
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    1. USVineet Bhatia
    1. USVineet Bhatia
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      1. POUpgrading from Flex 3.0 to Flex 3.6 - Custom Combobox getting TypeError in super.commitProperties()
      1. USVineet Bhatia
      1. VTFavorite
    1. COThere were a lot of changes to the ComboBox implementation in 3.5. We had to rework our AutoComplete ComboBox component significantly due to these. You're probably going to need to rework your custom ComboBox extension. But, you haven't provided us with nearly enough information to help you debug. I think we'd need to see your extended custom code. I'd look at line 59 of PLCustomComboBox.
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      1. POUpgrading from Flex 3.0 to Flex 3.6 - Custom Combobox getting TypeError in super.commitProperties()
      1. USJeffryHouser
    2. COThanks Jeff. Updated with component source. line # 59 is call to super.commitProperties()
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      1. POUpgrading from Flex 3.0 to Flex 3.6 - Custom Combobox getting TypeError in super.commitProperties()
      1. USVineet Bhatia
    3. COMay I ask why you would want to upgrade from one legacy SDK to another? I have to admit I haven't touched Flex 3 since many years, so I may be overlooking something, but from where I stand that seems like a pointless operation.
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      1. POUpgrading from Flex 3.0 to Flex 3.6 - Custom Combobox getting TypeError in super.commitProperties()
      1. USRIAstar
 

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