Mouse Position

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var mousePositionControl = new ol.control.MousePosition({
  coordinateFormat: ol.coordinate.createStringXY(4),
  projection: 'EPSG:4326',
  // comment the following two lines to have the mouse position
  // be placed within the map.
  className: 'custom-mouse-position',
  target: document.getElementById('mouse-position'),
  undefinedHTML: '&nbsp;'
});

var map = new ol.Map({
  controls: ol.control.defaults({
    attributionOptions: {
      collapsible: false
    }
  }).extend([mousePositionControl]),
  layers: [
    new ol.layer.Tile({
      source: new ol.source.OSM()
    })
  ],
  target: 'map',
  view: new ol.View({
    center: [0, 0],
    zoom: 2
  })
});

var projectionSelect = document.getElementById('projection');
projectionSelect.addEventListener('change', function(event) {
  mousePositionControl.setProjection(event.target.value);
});

var precisionInput = document.getElementById('precision');
precisionInput.addEventListener('change', function(event) {
  var format = ol.coordinate.createStringXY(event.target.valueAsNumber);
  mousePositionControl.setCoordinateFormat(format);
});

<!DOCTYPE html>
<html>
  <head>
    <title>Mouse Position</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>
  </head>
  <body>
    <div id="map" class="map"></div>
    <div id="mouse-position"></div>
    <form>
      <label>Projection </label>
      <select id="projection">
        <option value="EPSG:4326">EPSG:4326</option>
        <option value="EPSG:3857">EPSG:3857</option>
      </select>
      <label>Precision </label>
      <input id="precision" type="number" min="0" max="12" value="4"/>
    </form>
    <script>
      var mousePositionControl = new ol.control.MousePosition({
        coordinateFormat: ol.coordinate.createStringXY(4),
        projection: 'EPSG:4326',
        // comment the following two lines to have the mouse position
        // be placed within the map.
        className: 'custom-mouse-position',
        target: document.getElementById('mouse-position'),
        undefinedHTML: '&nbsp;'
      });

      var map = new ol.Map({
        controls: ol.control.defaults({
          attributionOptions: {
            collapsible: false
          }
        }).extend([mousePositionControl]),
        layers: [
          new ol.layer.Tile({
            source: new ol.source.OSM()
          })
        ],
        target: 'map',
        view: new ol.View({
          center: [0, 0],
          zoom: 2
        })
      });

      var projectionSelect = document.getElementById('projection');
      projectionSelect.addEventListener('change', function(event) {
        mousePositionControl.setProjection(event.target.value);
      });

      var precisionInput = document.getElementById('precision');
      precisionInput.addEventListener('change', function(event) {
        var format = ol.coordinate.createStringXY(event.target.valueAsNumber);
        mousePositionControl.setCoordinateFormat(format);
      });
    </script>
  </body>
</html>