I'm trying to add an itemrenderer to a datagrid dynamically,
dempending on the number of column of the dataprovider, which can be
different everytime.
I was able to handler everything, but I got a wierd bug. Everytime I
recive the data I get 4 error from the player saying:
TypeError: Error #1009: unable to access one property or a method of
a reference object null.
at views::DayRenderer/handleDataChanged()
at
flash.events::EventDispatcher/flash.events:EventDispatcher::dispatchE
ventFunction()
at flash.events::EventDispatcher/dispatchEvent()
at mx.core::Container/set data()
at mx.controls::DataGrid/::setupRendererFromData()
at
mx.controls::DataGrid/mx.controls:DataGrid::commitProperties()
at mx.core::UIComponent/validateProperties()
at mx.managers::LayoutManager/::validateProperties()
at mx.managers::LayoutManager/::doPhasedInstantiation()
at Function/http://adobe.com/AS3/2006/builtin::apply()
but if I keep pressing the continue button of the aller finally, I
can see the results and the renderer works fine.
It look like the renderer is trying to access the property data
before it's popolated, is this a bug or I'm doing something wrong?
renderer code (DayRenderer):
<?xml version="1.0" encoding="utf-8"?>
<mx:VBox xmlns:mx="http://www.adobe.com/2006/mxml";
preinitialize="initComponent();"
implements="mx.controls.listClasses.IDropInListItemRenderer"
>
<mx:Script>
<![CDATA[
import mx.events.FlexEvent;
import mx.controls.dataGridClasses.DataGridListData;
import mx.controls.listClasses.BaseListData;
import flash.events.Event;
//Importing interface IDropInListItemRenderer
requirements
private var _listData:BaseListData;
public function get listData():BaseListData{
return _listData;
}
public function set listData(value:BaseListData):void{
_listData = value;
dispatchEvent(new FlexEvent(FlexEvent.DATA_CHANGE));
}
private var itm:Object;
public function initComponent():void {
addEventListener("dataChange", handleDataChanged);
}
public function handleDataChanged(event:Event):void {
// Cast listData to DataGridListData.
var myListData:DataGridListData = DataGridListData
(listData);
if(data != null){
itm = data[myListData.dataField];
testo.text = itm.celltype;
testo2.text = itm.label;
}
}
]]>
</mx:Script>
<mx:Text id="testo"/>
<mx:Text id="testo2"/>
</mx:VBox>
this is the function were I build the grid;
public function setBooking():void{
var milliSecondsPerDay:int = 86400000;
var days:int = (toDf.selectedDate.getTime() -
fromDf.selectedDate.getTime()) / milliSecondsPerDay;
var newColumns : Array = new Array();
for(var i:int = 0; i < days; i++){
var newColumn:DataGridColumn = new DataGridColumn("cell"+i);
newColumn.itemRenderer = new ClassFactory views.DayRenderer);
newColumn.headerText = "giorno "+i
newColumns.push(newColumn);
}
bookingList.columns = newColumns;
bookingList.dataProvider = model.bookingData;
}
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