Question

I am trying to develop a mobile based flex application.

In my application, I have two views.

I am trying to pass the ArrayCollection as a data from one view to another view, but while trying to access ArrayCollection on the second view, I am getting an error ..

Here’s code from firstView.mxml :

dirSteps is the arraycollection that I am trying to pass to next view …

for (var r:Number = 0 ; r < directions.numRoutes; r++ ) {
                    var route:Route = directions.getRoute(r);

                    if (r >= 0 || r < (numRoutes - 1)) {
                        var midMarker:Marker = new Marker(route.endLatLng);
                        map.addOverlay(midMarker);
                    }
                    var numSteps:uint = route.numSteps;
                    for (var s:Number = 0 ; s < numSteps ; s++ ) {
                        var step:Step = route.getStep(s);
                        dirSteps.addItem({Step: (s+1), Description: step.descriptionHtml, Distance: step.distanceHtml, LatLng: step.latLng});
                    }
                }
                dirSteps.refresh(); 
 } 


 ..... some more code ...
 navigator.pushView(DetailDirection,dirSteps); 

---

Code from DetailDirection.mxml :

[Bindable]
private var directionList:ArrayCollection;

private function init():void {
    directionList = new ArrayCollection(ArrayUtil.toArray(data));

    // here, data should be my arraycollection, but throws above error on 
    // trying to access property (i.e Step, Distance etc .. ) of ArrayCollection ...
    trace(data.Distance);
}

---

Error: Unknown Property: ‘Distance’. at
mx.collections::ListCollectionView/http://www.adobe.com/2006/actionscript/flash/proxy::getProperty()[E:\dev\4.y\frameworks\projects\framework\src\mx\collections\ListCollectionView.as:870]
at views::DetailDirection/init()[C:\Documents and
Settings\ARSENAL\Adobe Flash Builder
4.6\CityExplorer_v2.0\src\views\DetailDirection.mxml:21] at views::DetailDirection/___DetailDirection_View1_creationComplete()[C:\Documents
and Settings\ARSENAL\Adobe Flash Builder
4.6\CityExplorer_v2.0\src\views\DetailDirection.mxml:6] at flash.events::EventDispatcher/dispatchEventFunction() at
flash.events::EventDispatcher/dispatchEvent() at
mx.core::UIComponent/dispatchEvent()[E:\dev\4.y\frameworks\projects\framework\src\mx\core\UIComponent.as:13152]
at mx.core::UIComponent/set
initialized()[E:\dev\4.y\frameworks\projects\framework\src\mx\core\UIComponent.as:1818]
at
mx.managers::LayoutManager/doPhasedInstantiation()[E:\dev\4.y\frameworks\projects\framework\src\mx\managers\LayoutManager.as:842]
at
mx.managers::LayoutManager/doPhasedInstantiationCallback()[E:\dev\4.y\frameworks\projects\framework\src\mx\managers\LayoutManager.as:1180]

---

What is causing this error ? What needs to be done ?

Anything that I am missing here ?

Thanks

Answer 1

Distance is not a documented property on an ArrayCollection that is why it throws an error.

the data property is usually a generic object; and the Flex Compiler generally does not throw compile errors when accessing properties directly against it.

You probably want to access an item in the ArrayCollection; something like this:

((data as ArrayCollection).getItemAt(0) as MyObjectType).distance