Custom Controls

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/**
 * Define a namespace for the application.
 */
window.app = {};
var app = window.app;

//
// Define rotate to north control.
//

/**
 * @constructor
 * @extends {ol.control.Control}
 * @param {Object=} opt_options Control options.
 */
app.RotateNorthControl = function(opt_options) {

var options = opt_options || {};

var button = document.createElement('button');
  button.innerHTML = 'N';

var this_ = this;
  var handleRotateNorth = function() {
    this_.getMap().getView().setRotation(0);
  };

button.addEventListener('click', handleRotateNorth, false);
  button.addEventListener('touchstart', handleRotateNorth, false);

var element = document.createElement('div');
  element.className = 'rotate-north ol-unselectable ol-control';
  element.appendChild(button);

ol.control.Control.call(this, {
    element: element,
    target: options.target
  });

};
ol.inherits(app.RotateNorthControl, ol.control.Control);

//
// Create map, giving it a rotate to north control.
//

var map = new ol.Map({
  controls: ol.control.defaults({
    attributionOptions: {
      collapsible: false
    }
  }).extend([
    new app.RotateNorthControl()
  ]),
  layers: [
    new ol.layer.Tile({
      source: new ol.source.OSM()
    })
  ],
  target: 'map',
  view: new ol.View({
    center: [0, 0],
    zoom: 3,
    rotation: 1
  })
});

<!DOCTYPE html>
<html>
  <head>
    <title>Custom Controls</title>
    <link rel="stylesheet" href="https://openlayers.org/en/v4.6.4/css/ol.css" type="text/css">
    <!-- The line below is only needed for old environments like Internet Explorer and Android 4.x -->
    <script src=""></script>
    <script src="https://openlayers.org/en/v4.6.4/build/ol.js"></script>
    <style>
      .rotate-north {
        top: 65px;
        left: .5em;
      }
      .ol-touch .rotate-north {
        top: 80px;
      }
    </style>
  </head>
  <body>
    <div id="map" class="map"></div>
    <script>
      /**
       * Define a namespace for the application.
       */
      window.app = {};
      var app = window.app;


      //
      // Define rotate to north control.
      //


      /**
       * @constructor
       * @extends {ol.control.Control}
       * @param {Object=} opt_options Control options.
       */
      app.RotateNorthControl = function(opt_options) {

        var options = opt_options || {};

        var button = document.createElement('button');
        button.innerHTML = 'N';

        var this_ = this;
        var handleRotateNorth = function() {
          this_.getMap().getView().setRotation(0);
        };

        button.addEventListener('click', handleRotateNorth, false);
        button.addEventListener('touchstart', handleRotateNorth, false);

        var element = document.createElement('div');
        element.className = 'rotate-north ol-unselectable ol-control';
        element.appendChild(button);

        ol.control.Control.call(this, {
          element: element,
          target: options.target
        });

      };
      ol.inherits(app.RotateNorthControl, ol.control.Control);


      //
      // Create map, giving it a rotate to north control.
      //


      var map = new ol.Map({
        controls: ol.control.defaults({
          attributionOptions: {
            collapsible: false
          }
        }).extend([
          new app.RotateNorthControl()
        ]),
        layers: [
          new ol.layer.Tile({
            source: new ol.source.OSM()
          })
        ],
        target: 'map',
        view: new ol.View({
          center: [0, 0],
          zoom: 3,
          rotation: 1
        })
      });
    </script>
  </body>
</html>