Thanks Olaf, I see how your method passes variable myCondition into the header renderer.
But, doesn't this only occur when the data grid is created? That is, once the data grid already exists, how can I programmatically pass the variable myCondition into the header renderer sometime later (once myCondition changes)? For example, if I make variable myCondition bindable, would that cause it to auto-update the header renderer when myCondition changes? Or something else? ----- Original Message ----- From: "Olaf Krüger" <[email protected]> To: "users, apache" <[email protected]> Sent: Monday, December 1, 2014 6:59:35 AM Subject: AW: how to updateDisplayList() in custom headerRenderer? (help!) If your question is "How to pass additional data to an item renderer" this could work for you: (Take a look at the links to understand how it works) /** * Pass additional data to a Renderer * * @see http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/mx/core/ClassFactory.html * @see http://stackoverflow.com/questions/528796/flex-sending-a-parameter-to-a-custom-itemrenderer */ public static function createHeaderRenderer (renderer:Class, myCondition:Number):IFactory { var factory:ClassFactory = new ClassFactory(renderer); factory.properties = { myCondition: myCondition }; return factory; } … <s:GridColumn headerRenderer="{createHeaderRenderer(MyHeaderRenderer, myCondition)}"/> … -----Ursprüngliche Nachricht----- Von: [email protected] [mailto:[email protected]] Gesendet: Montag, 1. Dezember 2014 15:20 An: users, apache Betreff: Re: how to updateDisplayList() in custom headerRenderer? (help!) Hello again, I haven't got any response and was just hoping I could entice someone to review my question below. The code implements a textbook method to update the client model when someone changes the text in a spark TextInput located in a header renderer. This works fine. I just need to know a textbook method to go the other direction -- that is, how to programmatically update the text in the TextInput? I'm sure there's some standard way to do this, but I can't figure it out. Any hints much appreciated. I've tried to copy all the relevant code below. ----- Original Message ----- From: [email protected] To: "users, apache" <[email protected]> Sent: Saturday, November 29, 2014 7:12:47 PM Subject: how to updateDisplayList() in custom headerRenderer? I'm using 4.12 SDK and trying to update a headerRenderer that includes a TextInput. Things works fine when the component is initialized. But thereafter, when I change the model such that the text showing in the TextInput box should change, the text doesn't change. Can someone help me figure out how to programmatically refresh the header renderer TextInput text using function updateCondition() in file MyView.mxml below? I've tried create a temp IFactory for the header renderer, null the original one, then save the temp back to the original, but this didn't work. Also tried invalidateDisplayList() on myGrid (didn't work either). Here's MyHeaderRenderer.mxml: <?xml version="1.0" encoding="utf-8"?> <s:GridItemRenderer xmlns:fx="http://ns.adobe.com/mxml/2009"; xmlns:s="library://ns.adobe.com/flex/spark" xmlns:mx="library://ns.adobe.com/flex/mx" xmlns:itemRenderers="com.example.views.itemRenderers.*"> <fx:Script> <![CDATA[ import mx.collections.ArrayCollection; import com.example.views.components.MyGrid; public function ti_focusOut():void { MyGrid(this.owner['parentDocument']).myCondition=Number(ti.text); MyGrid(this.owner['parentDocument']).dispatchEvent(new Event("myConditionChanged")); } override protected function updateDisplayList(unscaledWidth:Number, unscaledHeight:Number):void { if (this.owner['parentDocument'] && ti && MyGrid(this.owner['parentDocument']).myCondition) { ti.text=String(MyGrid(this.owner['parentDocument']).myCondition); } super.updateDisplayList(unscaledWidth,unscaledHeight); } ]]> </fx:Script> <s:states> <s:State name="normal"/> </s:states> <s:TextInput id="ti" width="40" focusOut="ti_focusOut();"/> </s:GridItemRenderer> and here's MyGrid.mxml: <?xml version="1.0" encoding="utf-8"?> <s:Group xmlns:fx="http://ns.adobe.com/mxml/2009"; xmlns:s="library://ns.adobe.com/flex/spark" xmlns:mx="library://ns.adobe.com/flex/mx"> <fx:Metadata> [Event(name="myConditionChanged", type="flash.events.Event")] </fx:Metadata> <fx:Script> <![CDATA[ ... [Bindable] private var _myCondition:Number; public function set myCondition(value:Number):void { _myCondition=value; if (grid.columnHeaderGroup) { grid.columnHeaderGroup.layout.clearVirtualLayoutCache(); grid.columnHeaderGroup.invalidateDisplayList(); } grid.invalidateDisplayList(); } [Bindable] public function get myCondition():Number { return _myCondition; } ... ]]> </fx:Script> <s:DataGrid id="grid"> <s:columns> <s:ArrayList> <s:GridColumn .../> <s:GridColumn id="myColumn" dataField="myCond" headerRenderer="com.example.views.itemRenderers.MyHeaderRenderer"/> <s:GridColumn .../> </s:ArrayList> </s:columns> </s:DataGrid> </s:Group> and finally, here is MyView.mxml: <?xml version="1.0" encoding="utf-8"?> <views:View xmlns:fx="http://ns.adobe.com/mxml/2009"; xmlns:s="library://ns.adobe.com/flex/spark" xmlns:mx="library://ns.adobe.com/flex/mx" xmlns:components="com.example.views.components.*"> ... <fx:Script> <![CDATA[ private function updateCondition():void { myGrid.myCondition=newValue; // how to force refresh of TextInput in header renderer with newValue? } private function onChange():void { ... } ]]> </fx:Script> <components:MyGrid id="myGrid" myConditionChanged="onChange();"/> ... </views:View> ________________________________ Edscha Holding GmbH Sitz der Gesellschaft: Remscheid Registergericht: Wuppertal, HRB 22889 Geschäftsführung: Francisco J. 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