Edit

Modify Features

modify4 edit10 vector56

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).

main.js
import 'ol/ol.css';
import GeoJSON from 'ol/format/GeoJSON';
import Map from 'ol/Map';
import View from 'ol/View';
import {
  Modify,
  Select,
  defaults as defaultInteractions,
} from 'ol/interaction';
import {OSM, Vector as VectorSource} from 'ol/source';
import {Tile as TileLayer, Vector as VectorLayer} from 'ol/layer';

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,
  }),
});
index.html
<!DOCTYPE html>
<html lang="en">
  <head>
    <title>Modify Features</title>
    <!-- Pointer events polyfill for old browsers, see https://caniuse.com/#feat=pointer -->
    <script src="https://unpkg.com/elm-pep"></script>
    <style>
      .map {
        width: 100%;
        height:400px;
      }
    </style>
  </head>
  <body>
    <div id="map" class="map"></div>
    <script src="main.js"></script>
  </body>
</html>
package.json
{
  "name": "modify-features",
  "dependencies": {
    "ol": "6.4.3"
  },
  "devDependencies": {
    "parcel": "1.11.0"
  },
  "scripts": {
    "start": "parcel index.html",
    "build": "parcel build --experimental-scope-hoisting --public-url . index.html"
  }
}