Edit

Modify Features

modify8 edit13 vector69

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 VectorLayer from 'ol/layer/Vector';
import VectorSource from 'ol/source/Vector';
import View from 'ol/View';
import {
  Modify,
  Select,
  defaults as defaultInteractions,
} from 'ol/interaction';
import {fromLonLat} from 'ol/proj';

const vector = new VectorLayer({
  background: 'white',
  source: new VectorSource({
    url: 'https://openlayers.org/data/vector/us-states.json',
    format: new GeoJSON(),
    wrapX: false,
  }),
});

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

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

const map = new Map({
  interactions: defaultInteractions().extend([select, modify]),
  layers: [vector],
  target: 'map',
  view: new View({
    center: fromLonLat([-100, 38.5]),
    zoom: 4,
  }),
});
index.html
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8">
    <title>Modify Features</title>
    <!-- Pointer events polyfill for old browsers, see https://caniuse.com/#feat=pointer -->
    <script src="https://unpkg.com/[email protected]/dist/elm-pep.js"></script>
    <!-- The lines below are only needed for old environments like Internet Explorer and Android 4.x -->
    <script src="https://cdn.polyfill.io/v3/polyfill.min.js?features=fetch,requestAnimationFrame,Element.prototype.classList,TextDecoder"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/core-js/3.18.3/minified.js"></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": "6.14.1"
  },
  "devDependencies": {
    "parcel": "^2.0.0"
  },
  "scripts": {
    "start": "parcel index.html",
    "build": "parcel build --public-url . index.html"
  }
}