is it possible to change data provider of flex chart from a seperate ActionScript class? - actionscript-3

Question

Im trying to change flex chart data provider from seperate action script class? is it possible. i did not find any method to do that. any ideas guys ?

Answer 1

Yes you can. For that you need to have a reference to dataprovider of chart and it should be bindable. It means when you update dataProvider you view also will be update ( chart in this case ).
If it doesn't help you, I would see your code.

Answer 2

Yes, you can. A nice clean way is to have a custom event dispatcher facade:
package com.app.facades
{
import flash.events.Event;
import flash.events.EventDispatcher;
[Event(name="showDataInGrid" , type="com.app.events.GridEvent")]
public class GridFacade extends EventDispatcher
{
private static var _instance:GridFacade;
public function GridFacade(lock:SingletonLock, target:IEventDispatcher=null) {
super(target);
if(!(lock is SingletonLock)) {
throw(new Error("GridFacade is a singleton, please do not make foreign instances of it"));
}
}
public static function getInstance():GridFacade {
if(!_instance) {
_instance = new GridFacade(new SingletonLock());
}
return _instance;
}
}
}
class SingletonLock{}
create a dispatchable event like so:
package com.app.events {
import flash.events.Event;
import flash.events.IEventDispatcher;
public class DispatchableEvent extends Event implements IDispatchableEvent {
protected var _dispatcher:IEventDispatcher;
public function DispatchableEvent(type:String, bubbles:Boolean=false, cancelable:Boolean=false)
{
super(type, bubbles, cancelable);
}
public function dispatch():void
{
_dispatcher.dispatchEvent(this);
}
}
}
then have a custom GridEvent like so:
package com.app.events {
public class GridEvent extends DispatchableEvent {
public static const SHOW_DATA_IN_GRID:String = "showDataInGrid";
public var data:Object;
public function GridEvent(type:String,
data:ArrayCollection = null,
bubbles:Boolean=false,
cancelable:Boolean=false) {
super(type,bubbles,cancelable);
_dispatcher = GridFacade.getInstance();
this.data = data;
}
}
}
then listen for the showDataInGrid event in the scope of your grid component:
...
GridFacade.getInstance().addEventListener(GridEvent.SHOW_DATA_IN_GRID, onShowDataInGrid);
...
protected function onShowDataInGrid(event:GridEvent):void {
myGrid.dataProvider = event.data;
// refresh the collection so that the component will display the new data
event.data.refresh();
// remember to reset any data specific stuff you may have set in the grid component before doing this.
}
to actually change the data, in any class you wish do the following:
(new GridEvent(
GridEvent.SHOW_DATA_IN_GRID,
someCollectionToShowInTheGrid,
)).dispatch();
And watch the magic! :)
good luck!