Throws:

• DeveloperError : Element with id "container" does not exist in the document.
• DeveloperError : options.selectedImageryProviderViewModel is not available when not using the BaseLayerPicker widget, specify options.baseLayer instead.
• DeveloperError : options.selectedTerrainProviderViewModel is not available when not using the BaseLayerPicker widget, specify options.terrainProvider instead.

Example:

// Initialize the viewer widget with several custom options and mixins.
try {
  const viewer = new Cesium.Viewer("cesiumContainer", {
    // Start in Columbus Viewer
    sceneMode: Cesium.SceneMode.COLUMBUS_VIEW,
    // Use Cesium World Terrain
    terrain: Cesium.Terrain.fromWorldTerrain(),
    // Hide the base layer picker
    baseLayerPicker: false,
    // Use OpenStreetMaps
    baseLayer: new Cesium.ImageryLayer(new Cesium.OpenStreetMapImageryProvider({
      url: "https://tile.openstreetmap.org/"
    })),
    skyBox: new Cesium.SkyBox({
      sources: {
        positiveX: "stars/TychoSkymapII.t3_08192x04096_80_px.jpg",
        negativeX: "stars/TychoSkymapII.t3_08192x04096_80_mx.jpg",
        positiveY: "stars/TychoSkymapII.t3_08192x04096_80_py.jpg",
        negativeY: "stars/TychoSkymapII.t3_08192x04096_80_my.jpg",
        positiveZ: "stars/TychoSkymapII.t3_08192x04096_80_pz.jpg",
        negativeZ: "stars/TychoSkymapII.t3_08192x04096_80_mz.jpg"
      }
    }),
    // Show Columbus View map with Web Mercator projection
    mapProjection: new Cesium.WebMercatorProjection()
  });
} catch (error) {
  console.log(error);
}

// Add basic drag and drop functionality
viewer.extend(Cesium.viewerDragDropMixin);

// Show a pop-up alert if we encounter an error when processing a dropped file
viewer.dropError.addEventListener(function(dropHandler, name, error) {
  console.log(error);
  window.alert(error);
});

Demo:

• Cesium Sandcastle Hello World Demo

See:

• Animation
• BaseLayerPicker
• CesiumWidget
• FullscreenButton
• HomeButton
• SceneModePicker
• Timeline
• viewerDragDropMixin