topic Re: Layer switcher/selector in ArcGIS API for Flex Questions

Layer switcher/selector

AlexVM — Mon, 02 Jun 2014 06:03:25 GMT

I'm looking for some code to create a layer switcher or selector like the layer switcher widget from flex viewer.
I would need to use it with csv layer, so, I don't know if this is possible to be done.
Can a widget from flex viewer be used in flex api?

Thanks in advance!

Re: Layer switcher/selector

BradleySnider — Thu, 05 Jun 2014 17:46:52 GMT

Alex, most of our samples have a basemap switcher. Is this what you are referring to? If so download one of the samples from https://github.com/Esri/arcgis-samples-flex. All, of our examples contain this code. You will need to create a drop-down list with an array of the layer URLs, and create a TiledMapServiceLayer within the map.

Re: Layer switcher/selector

AlexVM — Fri, 06 Jun 2014 11:20:50 GMT

Alex, most of our samples have a basemap switcher. Is this what you are referring to? If so download one of the samples from https://github.com/Esri/arcgis-samples-flex. All, of our examples contain this code. You will need to create a drop-down list with an array of the layer URLs, and create a TiledMapServiceLayer within the map.

Hi Brad, thanks for your answer. What i'm trying to find is a code example where you can select/deselect map available layers, similar to what you can find in arcgis flex viewer, but for layers, not for basemap.

I'm trying to find the sample code you said in github but no luck yet.

Thanks in advance!

Re: Layer switcher/selector

AlexVM — Fri, 06 Jun 2014 11:25:45 GMT

Brad, this is what you were talking about?

<esri:Map id="myMap"
              level="4"
              load="myMap.centerAt(new MapPoint(-11713000, 4822000))">
        <esri:ArcGISTiledMapServiceLayer show="layerShowHandler(event)"
                                         url="http://server.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer"
                                         visible="{bb.selectedIndex == 0}"/>
        <esri:ArcGISTiledMapServiceLayer show="layerShowHandler(event)"
                                         url="http://server.arcgisonline.com/ArcGIS/rest/services/World_Topo_Map/MapServer"
                                         visible="{bb.selectedIndex == 1}"/>
        <esri:ArcGISTiledMapServiceLayer show="layerShowHandler(event)"
                                         url="http://server.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer"
                                         visible="{bb.selectedIndex == 2}"/>
        <esri:ArcGISTiledMapServiceLayer show="layerShowHandler(event)"
                                         url="http://server.arcgisonline.com/ArcGIS/rest/services/Ocean_Basemap/MapServer"
                                         visible="{bb.selectedIndex == 3}"/>
        <esri:ArcGISTiledMapServiceLayer show="layerShowHandler(event)"
                                         url="http://server.arcgisonline.com/ArcGIS/rest/services/NatGeo_World_Map/MapServer"
                                         visible="{bb.selectedIndex == 4}"/>
    </esri:Map>
    <s:ButtonBar id="bb"
                 right="5" top="5"
                 requireSelection="true">
        <s:dataProvider>
            <s:ArrayList>
                <fx:String>Streets</fx:String>
                <fx:String>Topographic</fx:String>
                <fx:String>Imagery</fx:String>
                <fx:String>Oceans</fx:String>
                <fx:String>National Geographic</fx:String>
            </s:ArrayList>
        </s:dataProvider>
    </s:ButtonBar>
</s:Application>

BUt i think this is for basemap only, not for layers. I would need to make the same but with a drop-down list and the list of layers (csv in this case), could you help me?

Thanks!

Re: Layer switcher/selector

EvelynHernandez — Tue, 17 Jun 2014 17:01:17 GMT

Just change the url to a layer url mapserver/0, mapserver/1, etc
Also dont forget to put the visible=true in the layer.

Example: For dynamic layer

<esri:ArcGISDynamicMapServiceLayer url="http://sampleserver3.arcgisonline.com/ArcGIS/rest/services/BloomfieldHillsMichigan/Parcels/MapServer"/>

Example for Feature layer

<esri:FeatureLayer graphicAdd="featurelayer1_graphicAddHandler(event)"
outFields="[FIPS,POP2000]"
url="http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Demographics/ESRI_Census_USA/MapServer/0"> </esri:FeatureLayer>

Source: https://developers.arcgis.com/flex/sample-code/using-samples.htm