ArcGIS WebMap - MapImage Sub Layer Visibility

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05-06-2019 05:32 AM
JithenSingh
Esri Contributor

Hi - Am doing some R&D and have the SampleWorldCities coming from ArcGIS Enterprise - https://arcgis.cloud.eaglegis.co.nz/portal/home/webmap/viewer.html?webmap=f16c88ffa42a425e9e26ee932a...

Using JS API 3.27, I need to toggle off the sub layers, for example "World".

I am able to get all of the layer ID's from - 

map._layers;

If I then call - 

layer = map.getLayer(layersToSet[i].layerID);
layer.hide()‍‍

The map does not toggle this layer off in the WebMap but the properties show that it has.

Am I missing something? Or is there another way of handling this with using ArcGIS Server services with within WebMap?

Thanks

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RobertScheitlin__GISP
MVP Esteemed Contributor

Jithen,

  Because you have to get the parent layer (ArcGISDyanmicMapServiceLayer class) then use the setVisibleLayers method on that layer.

map.getLayer("SampleWorldCities_9560").setVisibleLayers([2]);

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7 Replies
RobertScheitlin__GISP
MVP Esteemed Contributor

Jithen,

  Here is a working example of turning off a layer in your webmap.

<!DOCTYPE html>
<html>

<head>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
  <meta name="viewport" content="initial-scale=1, maximum-scale=1,user-scalable=no">
  <title>Create web map from id</title>

  <link rel="stylesheet" href="https://js.arcgis.com/3.28/dijit/themes/claro/claro.css">
  <link rel="stylesheet" href="https://js.arcgis.com/3.28/esri/css/esri.css">

  <script src="https://js.arcgis.com/3.28/" data-dojo-config="async:true"></script>
  <script>
    require([
      "dojo/parser",
      "dojo/ready",
      "dijit/layout/BorderContainer",
      "dijit/layout/ContentPane",
      "dojo/dom",
      "esri/map",
      "esri/urlUtils",
      "esri/arcgis/utils",
      "esri/dijit/Legend",
      "esri/dijit/Scalebar",
      "dojo/domReady!"
    ], function (
      parser,
      ready,
      BorderContainer,
      ContentPane,
      dom,
      Map,
      urlUtils,
      arcgisUtils,
      Legend,
      Scalebar
    ) {
      ready(function () {

        parser.parse();

        //if accessing webmap from a portal outside of ArcGIS Online, uncomment and replace path with portal URL
        arcgisUtils.arcgisUrl = "https://arcgis.cloud.eaglegis.co.nz/portal/sharing/content/items";
        arcgisUtils.createMap("f16c88ffa42a425e9e26ee932a3193d4", "map").then(function (response) {
          //update the app
          dom.byId("title").innerHTML = response.itemInfo.item.title;
          dom.byId("subtitle").innerHTML = response.itemInfo.item.snippet;

          var map = response.map;

          //add the scalebar
          var scalebar = new Scalebar({
            map: map,
            scalebarUnit: "english"
          });

          //add the legend. Note that we use the utility method getLegendLayers to get
          //the layers to display in the legend from the createMap response.
          var legendLayers = arcgisUtils.getLegendLayers(response);
          console.info(legendLayers);
          var legendDijit = new Legend({
            map: map,
            layerInfos: legendLayers
          }, "legend");
          legendDijit.startup();
          setTimeout(function(){
            var lyr = map.getLayer("SampleWorldCities_9560");
            lyr.hide();
          }, 2000);
        });

      });

    });

  </script>
  <style>
    html,
    body {
      height: 100%;
      width: 100%;
      margin: 0;
      padding: 0;
    }

    body {
      font-family: "Helvetica";
    }

    #header {
      background-color: #E8E8E8;
      height: 65px;
      margin: 5px 5px;
    }

    #mainWindow {
      width: 100%;
      height: 100%;
    }

    #title {
      padding-top: 2px;
      padding-left: 10px;
      font-size: 18pt;
      font-weight: 700;
    }

    #subtitle {
      font-size: small;
      padding-left: 40px;
    }

    #rightPane {
      background-color: #E8E8E8;
      margin: 5px;
      width: 20%;
    }

    #map {
      margin: 5px;
      padding: 0;
    }

  </style>
</head>

<body class="claro">
  <div id="mainWindow" data-dojo-type="dijit/layout/BorderContainer" data-dojo-props="design:'headline'">
    <div id="header" data-dojo-type="dijit/layout/ContentPane" data-dojo-props="region:'top'">
      <div id="title"></div>
      <div id="subtitle"></div>
    </div>
    <div id="map" data-dojo-type="dijit/layout/ContentPane" data-dojo-props="region:'center'"></div>
    <div id="rightPane" data-dojo-type="dijit/layout/ContentPane" data-dojo-props="region:'right'">
      <div id="legend"></div>
    </div>
  </div>
</body>

</html>
JithenSingh
Esri Contributor

Thanks. This uses a legend to getLegendLayers and then the layer ID following to layer.hide().

I already have valid layer ID’s through the approach that I have used, just that layer.hide() doesn’t do anything. Well it does - and re-querying the layer shows it as not visible but it still shows on the map.

I don’t need a legend so keen to investigate other options.

Thanks

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RobertScheitlin__GISP
MVP Esteemed Contributor

Jithen,

  ??? you can remove the whole legend portion and the code I provided still works using your webmap...

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JithenSingh
Esri Contributor

Thanks - Just had a deeper look. Should clarify that I am looking to turn off the sub layers within the service so not 

SampleWorldCities_9560

But instead - 

SampleWorldCities_9560_2

I have tried to turn off the main layer and that works OK. Turning off the sub layer for example for World does not work?

Thanks

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JithenSingh
Esri Contributor

So effectively if I do the following - 

var lyr = map.getLayer("SampleWorldCities_9560_2");
lyr.hide();

It does not work.

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RobertScheitlin__GISP
MVP Esteemed Contributor

Jithen,

  Because you have to get the parent layer (ArcGISDyanmicMapServiceLayer class) then use the setVisibleLayers method on that layer.

map.getLayer("SampleWorldCities_9560").setVisibleLayers([2]);
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JithenSingh
Esri Contributor

Thanks! - I did wonder about this. Means extra coding to traverse the layers. Ok - Thanks

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