topic Re: Layer List Widget, is it possible to only allow one selected layer at a time? in ArcGIS Viewer for Flex Questions

Layer List Widget, is it possible to only allow one selected layer at a time?

MartynSmith — Thu, 19 Jan 2012 16:41:02 GMT

I have transparencies set on my operational layers, and it can quickly become confusing when the user has multiple layers turned on. Is it possible to only allow one selected layer?

Thanks

Re: Layer List Widget, is it possible to only allow one selected layer at a time?

RobertScheitlin__GISP — Sat, 11 Dec 2021 18:36:07 GMT

Martyn,

Sure here is the code for that, you are responsible for ensuring that initally only one Op layer is visible:

This change goes in the src/com/esri/viewer/components/toc/tocClasses/TocMapLayerItem.as

    private function onLayerShow(event:FlexEvent):void
    {
        //Turn all other ops layers off before we switch this one on
        var opLayers:Array = ViewerContainer.getInstance().configData.opLayers;
        for (var i:int = 0; i < opLayers.length; i++){
            if(layer.id != opLayers.label)
                ViewerContainer.getInstance().mapManager.map.getLayer(opLayers.label).visible = false;
        }
        setVisible(layer.visible, true);
    }

Don't forget to click the top arrow (promote) and to click the Mark as answer check as shown below:

Re: Layer List Widget, is it possible to only allow one selected layer at a time?

MartynSmith — Fri, 20 Jan 2012 17:25:41 GMT

wow! perfect. cheers again Robert

Re: Layer List Widget, is it possible to only allow one selected layer at a time?

MartynSmith — Fri, 20 Jan 2012 17:58:45 GMT

Hmm.. is there any way to exclude a single layer from this new function? I have one point layer I've excluded from the LayerList widget that I need to be always on (despite the only one layer function you just created), and sitting on top of all other layers. I can add it to my basements, but then when I change visible layers with LayerListWidget, it goes below the newly activated layer

Re: Layer List Widget, is it possible to only allow one selected layer at a time?

RobertScheitlin__GISP — Fri, 20 Jan 2012 19:05:50 GMT

Martyn,

Sure just change this :

    private function onLayerShow(event:FlexEvent):void     {         //Turn all other ops layers off before we switch this one on         var opLayers:Array = ViewerContainer.getInstance().configData.opLayers;         for (var i:int = 0; i < opLayers.length; i++){             if(layer.id != opLayers.label)                 if(opLayers.label != "your point layer")                     ViewerContainer.getInstance().mapManager.map.getLayer(opLayers.label).visible = false;         }         setVisible(layer.visible, true);     }

Re: Layer List Widget, is it possible to only allow one selected layer at a time?

MartynSmith — Mon, 23 Jan 2012 17:38:36 GMT

cheers!

Thanks again

Re: Layer List Widget, is it possible to only allow one selected layer at a time?

BrunoPereira1 — Sat, 11 Dec 2021 18:36:10 GMT

Martyn,

Sure just change this :

    private function onLayerShow(event:FlexEvent):void
    {
        //Turn all other ops layers off before we switch this one on
        var opLayers:Array = ViewerContainer.getInstance().configData.opLayers;
        for (var i:int = 0; i < opLayers.length; i++){
            if(layer.id != opLayers.label)
                if(opLayers.label != "your point layer")
                    ViewerContainer.getInstance().mapManager.map.getLayer(opLayers.label).visible = false;
        }
        setVisible(layer.visible, true);
    }

Hi Robert,

I have a configData.opLayers inside a widget, but when I change on map the visibilities of this layers, my configData.opLayers continues with old value, how I update this values?

I think this values are inside the ViewerContainer with my widget, and this values is setted whem widget initialize, after this, does not initilize again, has some way to remove from container this widget?

Thanks;

Re: Layer List Widget, is it possible to only allow one selected layer at a time?

RaoBase — Tue, 27 Mar 2012 08:01:04 GMT

I would like to switch on one layer at a time in a group layer. Is this feasible with the layer list widget.
Works fine on Map Switcher.

Re: Layer List Widget, is it possible to only allow one selected layer at a time?

omega_cancer — Thu, 03 May 2012 03:00:52 GMT

Thanks Robert it helped. 🙂

Re: Layer List Widget, is it possible to only allow one selected layer at a time?

EricStarn2 — Sat, 11 Dec 2021 18:36:13 GMT

Martyn,

Sure here is the code for that, you are responsible for ensuring that initally only one Op layer is visible:

This change goes in the src/com/esri/viewer/components/toc/tocClasses/TocMapLayerItem.as
    private function onLayerShow(event:FlexEvent):void
    {
        //Turn all other ops layers off before we switch this one on
        var opLayers:Array = ViewerContainer.getInstance().configData.opLayers;
        for (var i:int = 0; i < opLayers.length; i++){
            if(layer.id != opLayers.label)
                ViewerContainer.getInstance().mapManager.map.getLayer(opLayers.label).visible = false;
        }
        setVisible(layer.visible, true);
    }
Don't forget to click the top arrow (promote) and to click the Mark as answer check as shown below:

Hello,
I am jumping in on this because I want to do this also and have a few questions.

I am using a layer list widget to display all of my operational layers and would like them all to be able to be turned on at once except a group layer I have. Then I only want to be able to turn on one sublayer at a time.

I this possible and if so, how?

Eric