Modify Features

Editing features with the modify interaction.

This example demonstrates how the modify and select interactions can be used together. Zoom in to an area of interest and select a feature for editing. Then drag points around to modify the feature. You can preserve topology by selecting multiple features before editing (Shift+Click to select multiple features).

<!DOCTYPE html>
<html>
  <head>
    <title>Modify Features</title>
    <link rel="stylesheet" href="https://openlayers.org/en/v5.3.0/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>

  </head>
  <body>
    <div id="map" class="map"></div>
    <script>
      import Map from 'ol/Map.js';
      import View from 'ol/View.js';
      import GeoJSON from 'ol/format/GeoJSON.js';
      import {defaults as defaultInteractions, Modify, Select} from 'ol/interaction.js';
      import {Tile as TileLayer, Vector as VectorLayer} from 'ol/layer.js';
      import {OSM, Vector as VectorSource} from 'ol/source.js';


      var raster = new TileLayer({
        source: new OSM()
      });

      var vector = new VectorLayer({
        source: new VectorSource({
          url: 'data/geojson/countries.geojson',
          format: new GeoJSON(),
          wrapX: false
        })
      });

      var select = new Select({
        wrapX: false
      });

      var modify = new Modify({
        features: select.getFeatures()
      });

      var map = new Map({
        interactions: defaultInteractions().extend([select, modify]),
        layers: [raster, vector],
        target: 'map',
        view: new View({
          center: [0, 0],
          zoom: 2
        })
      });
    </script>
  </body>
</html>