@terrestris/ol-util/dist/FileUtil/FileUtil.js

A set of helper classes for working with openLayers

import OlFormatGeoJSON from 'ol/format/GeoJSON';
import OlLayerVector from 'ol/layer/Vector';
import OlSourceVector from 'ol/source/Vector';
import shp from 'shpjs';
/**
 * Helper class for adding layers from various file formats.
 *
 * @class
 */
export class FileUtil {
    /**
     * Adds a new vector layer from a geojson file.
     * @param {File} file the file to read the geojson from
     * @param {import("ol/Map").default} map the map to add the layer to
     */
    static addGeojsonLayerFromFile(file, map) {
        const reader = new FileReader();
        reader.readAsText(file);
        reader.addEventListener('loadend', () => {
            const content = reader.result;
            FileUtil.addGeojsonLayer(content, map);
        });
    }
    /**
     * Adds a new vector layer from a shape file (zip).
     * @param {File} file the file to read the geojson from
     * @param {import("ol/Map").default} map the map to add the layer to
     */
    static addShpLayerFromFile(file, map) {
        const reader = new FileReader();
        reader.readAsArrayBuffer(file);
        reader.addEventListener('loadend', () => {
            const blob = reader.result;
            shp(blob).then((json) => {
                FileUtil.addGeojsonLayer(json, map);
            });
        });
    }
    /**
     * Adds a new vector layer from a geojson string.
     * @param {string|object} json the geojson string or object
     * @param {import("ol/Map").default} map the map to add the layer to
     */
    static addGeojsonLayer(json, map) {
        const format = new OlFormatGeoJSON();
        const features = format.readFeatures(json);
        const layer = new OlLayerVector({
            source: new OlSourceVector({
                features: features
            })
        });
        map.addLayer(layer);
    }
}
export default FileUtil;
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