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    <meta charset="utf-8" />
      content="initial-scale=1, maximum-scale=1,user-scalable=no"

     ArcGIS API for JavaScript,
     For more information about the widgets-layerlist-actions sample,
     read the original sample description at
      LayerList widget with actions | Sample | ArcGIS API for JavaScript 4.19

      #viewDiv {
        padding: 0;
        margin: 0;
        height: 100%;
        width: 100%;
        overflow: hidden;

    <script src=""></script>

      ], function (Map, MapView, GroupLayer, MapImageLayer, LayerList, Legend) {
        // Create layer showing sample data of the United States.

        var USALayer = new MapImageLayer({
          title: "US Sample Data"

        // Create layer showing sample census data of the United States.
        // Set visibility to false so it's not visible on startup.

        var censusLayer = new MapImageLayer({
          title: "US Sample Census",
          visible: false

        // Create GroupLayer with the two MapImageLayers created above
        // as children layers.

        var demographicGroupLayer = new GroupLayer({
          title: "US Demographics",
          visible: true,
          visibilityMode: "exclusive",
          layers: [USALayer, censusLayer],
          opacity: 0.75

        // Create a map and add the group layer to it

        var map = new Map({
          basemap: "dark-gray-vector",
          layers: [demographicGroupLayer]

        // Add the map to a MapView

        var view = new MapView({
          center: [-98.5795, 39.8282],
          zoom: 4,
          container: "viewDiv",
          map: map

        var legend = new Legend({
          view: view
        view.ui.add(legend, "bottom-left");

        // Creates actions in the LayerList.

        function defineActions(event) {
          // The event object contains an item property.
          // is is a ListItem referencing the associated layer
          // and other properties. You can control the visibility of the
          // item, its title, and actions using this object.

          var item = event.item;

          if (item.title === "US Demographics") {
            // An array of objects defining actions to place in the LayerList.
            // By making this array two-dimensional, you can separate similar
            // actions into separate groups with a breaking line.

            item.actionsSections = [
                  title: "Go to full extent",
                  className: "esri-icon-zoom-out-fixed",
                  id: "full-extent"
                  title: "Layer information",
                  className: "esri-icon-description",
                  id: "information"
                  title: "Increase opacity",
                  className: "esri-icon-up",
                  id: "increase-opacity"
                  title: "Decrease opacity",
                  className: "esri-icon-down",
                  id: "decrease-opacity"

        view.when(function () {
          // Create the LayerList widget with the associated actions
          // and add it to the top-right corner of the view.

          var layerList = new LayerList({
            view: view,
            // executes for each ListItem in the LayerList
            listItemCreatedFunction: defineActions

          // Event listener that fires each time an action is triggered

          layerList.on("trigger-action", function (event) {
            // The layer visible in the view at the time of the trigger.
            var visibleLayer = USALayer.visible ? USALayer : censusLayer;

            // Capture the action id.
            var id =;

            if (id === "full-extent") {
              // if the full-extent action is triggered then navigate
              // to the full extent of the visible layer
              view.goTo(visibleLayer.fullExtent).catch(function (error) {
                if ( != "AbortError") {
            } else if (id === "information") {
              // if the information action is triggered, then
              // open the item details page of the service layer
            } else if (id === "increase-opacity") {
              // if the increase-opacity action is triggered, then
              // increase the opacity of the GroupLayer by 0.25

              if (demographicGroupLayer.opacity < 1) {
                demographicGroupLayer.opacity += 0.25;
            } else if (id === "decrease-opacity") {
              // if the decrease-opacity action is triggered, then
              // decrease the opacity of the GroupLayer by 0.25

              if (demographicGroupLayer.opacity > 0) {
                demographicGroupLayer.opacity -= 0.25;

          // Add widget to the top right corner of the view
          view.ui.add(layerList, "top-right");

    <div id="viewDiv"></div>