Hi shankar, Try this one. This may help you. There is a property called creationPolicy and set it to "all". This is a property for containers and this property initializes all its child components of a parent component.
On 3/12/09, Sankar <[email protected]> wrote: > > > > That is not the reason because even if i create the initData array > collection object with the new keyword am getting the same error. > > See even if you create with new keyword, you don't have data > property available since you don't have the data getting bounded to > the array collection object and it is a null only but where as > itemRenderer is getting executing by that time.This is the reason am > getting the error. > > I think the solution is that itemrenderer should be executed only > when the data gets bounded to initData. > > Thanks > sankar > On Mar 12, 5:21 pm, Ravi Mishra <[email protected]> wrote: > > I got the problem when your application loads it finds the initData as > > null because you have assigned the null value to it and that is why > > you are getting the error message. > > > > Try doing it using the new keyword. Like this > > > > [Bindable] > > private var initData:ArrayCollection = new ArrayCollection(); > > > > HTH, > > > > -Ravi > > > > On Mar 12, 2:10 pm, Sankar <[email protected]> wrote: > > > > > here am sending only the Application file and am using the same > > > itemrenderer which is in my previous posts. > > > > > Application File: > > > > > <?xml version="1.0" encoding="utf-8"?> > > > <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"; > > > layout="absolute" initialize="initList()" creationComplete="getData()> > > > > > <mx:Script> > > > <![CDATA[ > > > import mx.collections.ArrayCollection; > > > > > [Bindable] > > > private var initData:ArrayCollection = null; > > > > > private function initList():void { > > > addEventListener("getItems", > > > getItemsEventHandler); > > > } > > > > > private function getData():void > > > { > > > try { > > > //am calling the backend > method here > > > (services code which > actually calls the backend > > > code using Remote Object) > > > } > > > catch(errObject:Error) { > > > trace(errObject.message); > > > } > > > } > > > > > private function getItemsEventHandler > > > (event:GetTodoItemsResultEvent):void { > > > > > initData = event.result; > > > } > > > ]]> > > > </mx:Script> > > > > > <mx:List dataProvider="{initData}" width="50%" height="50%" > > > itemRenderer="components.RendererInAS"/> > > > > > </mx:Application> > > > > > On Mar 12, 1:40 pm, Ravi Mishra <[email protected]> wrote: > > > > > > 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 > > > > ... > > > > read more ยป > > > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Flex India Community" group. 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