topic Re: ArcGISImageServiceLayer Time Error in ArcGIS API for Flex Questions

ArcGISImageServiceLayer Time Error

GlenReid — Mon, 31 Oct 2011 11:00:26 GMT

When I use an image service in mxml like so:

<esri:ArcGISImageServiceLayer id="esriImageLayer" imageFormat="png8" visible="false"
           url="http://sampleserver3.arcgisonline.com/ArcGIS/rest/services/World/MODIS/ImageServer"/>

everything works OK with the layer and timeSlider. When I create the layer in actionscript:

var lyr:ArcGISImageServiceLayer = new ArcGISImageServiceLayer("http://sampleserver3.arcgisonline.com/ArcGIS/rest/services/World/MODIS/ImageServer");
lyr.imageFormat = "png8";
lyr.visible = true;
timeSlider.createTimeStopsByTimeInterval(lyr.timeInfo.timeExtent, 1, TimeInfo.UNIT_MONTHS);
timeSlider.visible = true;

I get an error on the createTimeStopsByTimeInterval line:

TypeError: Error #1009: Cannot access a property or method of a null object reference.

Any idea as to what I'm missing here?

Thanks,
Glen

Re: ArcGISImageServiceLayer Time Error

IvanBespalov — Sun, 12 Dec 2021 16:39:47 GMT

lyr.timeInfo is NULL

Because layer is not loaded yet.

1 - Add layer to map:

map.addLayer(lyr);

or dispatch Layer load event (if you do not want to add layer to your map)

lyr.dispatchEvent(new LayerEvent(LayerEvent.LOAD, lyr));

2 - listen LayerEvent:

lyr.addEventListener(LayerEvent.LOAD, onLayerLoad, false, 0, true);
lyr.addEventListener(LayerEvent.LOAD_ERROR, onLayerLoadError, false, 0, true);

protected function onLayerLoad(event:LayerEvent):void
{
    //get lyr.timeInfo here
}

protected function onLayerLoadError(event:LayerEvent):void
{
    //trace error
}

Re: ArcGISImageServiceLayer Time Error

GlenReid — Mon, 31 Oct 2011 14:55:42 GMT

Thanks Ivan, that was the issue.