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HTML

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About the <head>

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CSS

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CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

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JavaScript

About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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HTML 

              
                <html>
  <head>
    <meta charset="utf-8" />
    <meta
      name="viewport"
      content="initial-scale=1, maximum-scale=1,user-scalable=no"
    />
    <title>Order by absolute value</title>
    <link
      rel="stylesheet"
      href="https://js.arcgis.com/4.21/esri/themes/light/main.css"
    />

    <style>
      html,
      body,
      #viewDiv {
        padding: 0;
        margin: 0;
        height: 100%;
        width: 100%;
        overflow: hidden;
      }
    </style>

    <script src="https://js.arcgis.com/4.21/"></script>
    <script>
      require(["esri/views/MapView", "esri/widgets/Legend", "esri/WebMap"], (
        MapView,
        Legend,
        WebMap
      ) => {
        const webmap = new WebMap({
          portalItem: {
            // autocasts as new PortalItem()
            id: "f4195192aad742b2b9628645548bac34"
          }
        });

        const view = new MapView({
          container: "viewDiv",
          map: webmap
        });

        view.when(() => {
          // get the first layer in the collection of operational layers in the WebMap
          // when the resources in the MapView have loaded.
          const featureLayer = webmap.layers.getItemAt(0);

          // arcade expression:

          const valueExpression = `
            var oneBed2010 = $feature["pvph_1dor_1"];
            var oneBed2020 = $feature["pvph_1dor"];

            return abs(oneBed2020 - oneBed2010);
          `;

          featureLayer.orderBy = {
            valueExpression,
            order: "descending"
          };

          const legend = new Legend({
            view
          });

          // Add widget to the bottom right corner of the view
          view.ui.add(legend, "top-right");
        });
      });
    </script>
  </head>

  <body class="calcite">
    <div id="viewDiv"></div>
  </body>
</html>
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