Responsive apps using CSS

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This sample watches the MapView's widthBreakpoint property and based on the view size, sets how the Legend widget displays in the view. For example, if the view is set to a very small size, i.e. xsmall, the Legend widget does not display. Rather, it shows the Expand widget.

     "widthBreakpoint", function(breakpoint) {
  switch (breakpoint) {
    case "xsmall":
    case "small":
    case "medium":
    case "large":
    case "xlarge":

Listening for breakpoints is helpful as it removes the need for multiple @media queries.

In addition to listening to breakpoints, the sample also makes use of CSS view-size classes. If the view's width is less than small, the UI's zoom in and zoom out buttons do not display.

.esri-view-width-less-than-small .esri-zoom .esri-widget--button {
  display: none;

To test this application, open the sample and resize the window larger and smaller. You should notice that when you get to a mobile-specific view size the Legend widget disappears and is replaced with the Expand widget. In addition, the zoom in and zoom out buttons no longer display.