Can you pls send the code where you are declaring the arraycollection? -Ravi
On Mar 12, 12:24 pm, Sankar <[email protected]> wrote: > Hi, > It works fine, if the data(ArrayCollection) is static but it > doesn't work if the data is dynamic i.e if you try to get the data > from the database and am getting the runtime error as shown below > > Cannot access a property or method of a null object > reference > > at the line where we were setting the value to the labels in the > commitProprties() method.Since we all know that, child component > elements(controls) will be created and initialized first and then > parent components will be created and initialized.In my parent > component am firing the creationComplete event to get the data from > the Database and it will be fired after the child components has been > created and initialized. > > In this case, first item renderer written in action script will > be executed and in that we were trying to set the values to labels and > the data property not available by that time and then creationComplete > event of it's parent component gets fired and now we will have the > data from the database.I think from 2nd time onwards data property > will be available. > > How do i solve this problem? I think itemrenderer should be executed > only when the data from the database gets bounded to arrayCollection > object. > Is it correct? > > Please, Can anyone help me ? > > Thanks > sankar > > On Mar 11, 7:45 pm, Sankar <[email protected]> wrote: > > > Hi Ravi, > > > I have seen your latest post and my problem got solved now.As you > > said i added that statement and it works fine. > > > Thanks > > sankar > > > On Mar 11, 7:11 pm, Ravi Mishra <[email protected]> wrote: > > > > Check out my second post in this thread which is as follows > > > > I am sorry that I misunderstood your question. > > > > You actually missed out a statement in createChildren Method. Just add > > > 'this.addChild(hBox);' at the end of createChildren method. > > > > HTH, > > > > -Ravi > > > > On Mar 11, 4:15 pm, Sankar <[email protected]> wrote: > > > > > Hi Ravi Mishra, > > > > > I already have seen this example but it doesn't help me . In this > > > > example data getting displayed with the help of DataGridColumn and in > > > > the itemRenderer written in actionScript just does the decoration by > > > > overriding the setter for data property. > > > > > But what am i trying to do is i wanted to laydown the controls also > > > > in the action script itself like how we use the containers say HBox in > > > > the custom itemRenderer in MXML and data proprty. I think in this > > > > case the link what you send doesn't help me. > > > > > Thanks > > > > sankar > > > > > On Mar 11, 1:52 pm, Ravi Mishra <[email protected]> wrote: > > > > > > Hi Sankar, > > > > > > You are on the wrong way. This is not the way you write an > > > > > itemRenderer. Please refer the folllowing link to get a clear idea > > > > > about itemrenderers in actionscript. > > > > > >http://livedocs.adobe.com/flex/201/html/wwhelp/wwhimpl/common/html/ww... > > > > > > HTH, > > > > > > -Ravi > > > > > > On Mar 11, 9:31 am, Sankar <[email protected]> wrote: > > > > > > > Hi All, > > > > > > > am trying to build item renderer for a List component in action > > > > > > script rather than in mxml. In the action script class am creating a > > > > > > HBox dynamically and adding Labels to is by overriding the > > > > > > createChildern() and also overriding the updateDisplayList() and > > > > > > commitProperties() and in which am setting the values to labels. > > > > > > > When i run the application in debug mode am able to see > > > > > > the > > > > > > values being set to the labels but am not seeing the values getting > > > > > > displayed in the List control. > > > > > > > Here am posting the code,so that the problem can be > > > > > > identified. > > > > > > > Can anyone help me how to resolve this problem? > > > > > > > <?xml version="1.0" encoding="utf-8"?> > > > > > > <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"; > > > > > > layout="absolute"> > > > > > > <mx:Script> > > > > > > <![CDATA[ > > > > > > import mx.collections.ArrayCollection; > > > > > > > [Bindable] > > > > > > private var initData:ArrayCollection = new > > > > > > ArrayCollection([ > > > > > > {task:"pay bill", > > > > > > category:"Office",priority:"Medium"}, > > > > > > {task:"meet ravi on > > > > > > sunday",category:"personal",priority:"Low"}, > > > > > > {task:"buy a > > > > > > book",category:"friends",priority:"Medium"}, > > > > > > {task:"play > > > > > > cricket",category:"friends",priority:"Low"}, > > > > > > ]); > > > > > > ]]> > > > > > > </mx:Script> > > > > > > > <mx:List dataProvider="{initData}" width="50%" height="50%" > > > > > > itemRenderer="components.RendererInAS"/> > > > > > > </mx:Application> > > > > > > > ItemRenderer file : > > > > > > > package components > > > > > > { > > > > > > > import mx.containers.HBox; > > > > > > import mx.controls.Label; > > > > > > import mx.controls.listClasses.BaseListData; > > > > > > import mx.controls.listClasses.IDropInListItemRenderer; > > > > > > import mx.controls.listClasses.IListItemRenderer; > > > > > > import mx.core.UIComponent; > > > > > > import mx.events.FlexEvent; > > > > > > > public class RendererInAS extends UIComponent implements > > > > > > IListItemRenderer { > > > > > > > public function RendererInAS() { > > > > > > super(); > > > > > > } > > > > > > > // Internal variable for the property value. > > > > > > private var _data:Object; > > > > > > > private var _listData:BaseListData; > > > > > > > // Make the data property bindable. > > > > > > [Bindable("dataChange")] > > > > > > > // Define the getter method. > > > > > > public function get data():Object { > > > > > > return _data; > > > > > > } > > > > > > > // Define the setter method, and dispatch an event > > > > > > when the > > > > > > property > > > > > > // changes to support data binding. > > > > > > public function set data(value:Object):void { > > > > > > _data = value; > > > > > > > invalidateProperties(); > > > > > > dispatchEvent(new > > > > > > FlexEvent(FlexEvent.DATA_CHANGE)); > > > > > > } > > > > > > > private var hBox:HBox; > > > > > > private var task:Label; > > > > > > private var category:Label; > > > > > > private var priority:Label; > > > > > > > override protected function createChildren():void { > > > > > > super.createChildren(); > > > > > > > hBox = new HBox(); > > > > > > > task = new Label(); > > > > > > category = new Label(); > > > > > > priority = new Label(); > > > > > > hBox.addChild (task); > > > > > > hBox.addChild (category); > > > > > > hBox.addChild (priority); > > > > > > } > > > > > > > override protected function commitProperties():void { > > > > > > super.commitProperties(); > > > > > > > hBox.horizontalScrollPolicy = 'off'; > > > > > > hBox.verticalScrollPolicy = 'off'; > > > > > > > hBox.percentWidth = 100; > > > > > > > task.text = _data.task; > > > > > > category.text = _data.category; > > > > > > priority.text = _data.priority; > > > > > > } > > > > > > > override protected function updateDisplayList > > > > > > (unscaledWidth:Number, unscaledHeight:Number):void { > > > > > > > > > > > > super.updateDisplayList(unscaledWidth,unscaledHeight); > > > > > > hBox.move(0,0); > > > > > > hBox.setActualSize( (unscaledWidth-4), > > > > > > unscaledHeight); > > > > > > } > > > > > > } > > > > > > > } > > > > > > > Thanks > > > > > > sankar --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Flex India Community" group. 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