Attributions

Example of a attributions visibily change on map resize, to collapse them on small maps.

When the map gets too small because of a resize, the attribution will be collapsed. This is because the collapsible option is set to true if the width of the map gets smaller than 600 pixels.

<!DOCTYPE html>
<html>
  <head>
    <title>Attributions</title>
    <link rel="stylesheet" href="https://openlayers.org/en/v4.3.4/css/ol.css" type="text/css">
    <!-- The line below is only needed for old environments like Internet Explorer and Android 4.x -->
    <script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList,URL"></script>
    <script src="https://openlayers.org/en/v4.3.4/build/ol.js"></script>
  </head>
  <body>
    <div id="map" class="map"></div>
    <script>
      var attribution = new ol.control.Attribution({
        collapsible: false
      });
      var map = new ol.Map({
        layers: [
          new ol.layer.Tile({
            source: new ol.source.OSM()
          })
        ],
        controls: ol.control.defaults({attribution: false}).extend([attribution]),
        target: 'map',
        view: new ol.View({
          center: [0, 0],
          zoom: 2
        })
      });

      function checkSize() {
        var small = map.getSize()[0] < 600;
        attribution.setCollapsible(small);
        attribution.setCollapsed(small);
      }

      window.addEventListener('resize', checkSize);
      checkSize();
    </script>
  </body>
</html>