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              <div id="mainWindow" data-dojo-type="dijit/layout/BorderContainer" data-dojo-props="design:'headline'">
  <div id="heading" data-dojo-type="dijit/layout/ContentPane" data-dojo-props="region: 'top'">
    <h3>Modifying Layer List to control visibility of webmap base layer</h3>
    <p>Here, the same map is created three times to compare how the ESRI LayerList handles the maps. The map on the left is manually defined with base topo layer and Census feature layer. The map in the middle is the same map created through ArcGIS Online. The map on the right is made from the same web map as the map in the middle, but the LayerList has been modified/hacked to show and toggle the base map layer visibility.</p> 
  </div>
  <div id="manualmap" data-dojo-type="dijit/layout/ContentPane" data-dojo-props="region:'left'">
    <div id="manualtoc" class="mytoc"></div>
  </div>
  
  <div id="agolmap" data-dojo-type="dijit/layout/ContentPane" data-dojo-props="region:'center'">
    <div id="agoltoc" class="mytoc"></div>
  </div>
  <div id="testmap" data-dojo-type="dijit/layout/ContentPane" data-dojo-props="region:'right'">
    <div id="testtoc" class="mytoc"></div>
  </div>
</div>
            
          
!
            
              html,
body,
#mainWindow {
  font-family: sans-serif;
  height: 100%;
  width: 100%;
}

html,
body {
  margin: 0;
  padding: 0;
}

#manualmap, #testmap {
  width: 30%;
}

.mytoc {
  position: absolute;
  top: 15px;
  right: 15px;
  left: auto;
  height: auto;
  width: auto;
  z-index: 105;
}

            
          
!
            
              define("LayerList.Modified", [
  "dojo/_base/declare",
  "dojo/_base/array",
  "dojo/query",
  "put-selector/put",
  "esri/dijit/LayerList"
  
], function (declare, arrayUtils, dojoQuery, put, LayerList) {
  return declare([LayerList], {
    
    _baseCheckTemplate: ["<div class='esriTitle'><div class='esriTitleContainer'>",
            "<input class='esriCheckbox' type='checkbox' checked='checked' id='adsfkja982djhk2uh2kjhf2df92' />",
            "<label class='esriLabel' for='adsfkja982djhk2uh2kjhf2df92'>{{baseLayerTitle}}</label></div></div>"].join(""),
    
    startup: function () {
      var baseLayerNode, baseLayer, baseLayerIsShown, baseLayerTitle;
      this.inherited(arguments);
      
      baseLayer = this.map.getLayer(this.map.layerIds[0]);
      baseLayerIsShown = arrayUtils.some(this.layers, function (layer) {
        return layer.id === baseLayer.id;
      });
      
      if (!baseLayerIsShown) {
        baseLayerTitle = this.params.basemapTitle || baseLayer.name || (baseLayer.arcgisProps && baseLayer.arcgisProps.title) || baseLayer.id.replace(/_+\d+$/, "");
        baseLayerNode = put(this._layersNode, "li.esriLayer");
        baseLayerNode.innerHTML = this._baseCheckTemplate.replace("{{baseLayerTitle}}", baseLayerTitle);
        dojoQuery("input[type=checkbox]", baseLayerNode).on("click", function (evt) {
          var checkBox = evt.target;
          var layer = this.map.getLayer(this.map.layerIds[0]);
          layer.setVisibility(checkBox.checked);
          evt.stopPropagation();
        }.bind(this));
      }
    }
  });
});

require([
  "esri/map",
  "esri/layers/FeatureLayer",
  "esri/arcgis/utils",
  "esri/dijit/LayerList",
  "LayerList.Modified",
  "dojo/parser",
  "dijit/layout/BorderContainer", "dijit/layout/ContentPane",
  "dijit/form/Button", "dijit/WidgetSet", "dojo/domReady!"
], function(
  Map, FeatureLayer, arcgisUtils, LayerList, ModdedLayerList,
  parser
) {
  parser.parse();

  var manualmap = new Map("manualmap", {
    basemap: "topo",
    center: [-80.469, 34.428],
    zoom: 8
  });
  
   manualmap.on("layers-add-result", function() {
    var layerList = new LayerList({
      map: manualmap,
      removeUnderscores: true,
      showLegend: false
    }, "manualtoc");
    layerList.startup();
  });
  
  var featureLayer = new FeatureLayer("https://services.arcgis.com/P3ePLMYs2RVChkJx/arcgis/rest/services/USA_Census_Populated_Places/FeatureServer/0", {
    mode: FeatureLayer.MODE_ONDEMAND,
    displayOnPan: false
  });
  
  manualmap.addLayers([featureLayer]);
 

  var deferred = arcgisUtils.createMap("c308884350d14e92834ff5d57eb4bcdb", "agolmap", {
    mapOptions: {
      zoom: 8
    },
    usePopupManager: true,
    geometryServiceURL: "http://sampleserver3.arcgisonline.com/ArcGIS/rest/services/Geometry/GeometryServer"
  });
  
  deferred.then(function (response) {
    var agolMap = response.map;
    var layerList = new LayerList({
      map: agolMap,
      //layers: arcgisUtils.getLayerList(response),
      removeUnderscores: true,
      showLegend: false
    }, "agoltoc");
    layerList.startup();
  });
  
  var def2 = arcgisUtils.createMap("c308884350d14e92834ff5d57eb4bcdb", "testmap", {
    mapOptions: {
      zoom: 8
    },
    usePopupManager: true,
    geometryServiceURL: "http://sampleserver3.arcgisonline.com/ArcGIS/rest/services/Geometry/GeometryServer"
  });
  
  def2.then(function (response) {
    var testmap = response.map;
    var layerList = new ModdedLayerList({
      map: testmap,
      //layers: arcgisUtils.getLayerList(response),
      removeUnderscores: true,
      showLegend: false
    }, "testtoc");
    layerList.startup();
  });
  
});
            
          
!
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