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I am trying to use harp.gl and used following tutorial. tutorial:https://developer.here.com/tutorials/harpgl/ But I am getting following errors.

MapView.ts:919 Uncaught TypeError: Cannot read property 'addEventListener' of null
    at new MapView (MapView.ts:919)
    at JavaScript.js:2
Kamal Panhwar
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ben siams
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1 Answers1

0

You tried to use the method 2 of tutorial on https://developer.here.com/tutorials/harpgl/ I made the same followed tutorial method2 and into the file index.ts implemented the mapView.addEventListener as you can see what contains my index.ts below:

/*
 * Copyright (C) 2017-2019 HERE Europe B.V.
 * Licensed under Apache 2.0, see full license in LICENSE
 * SPDX-License-Identifier: Apache-2.0
 */

import { GeoCoordinates } from "@here/harp-geoutils";
import { View } from "./View";
import { MapViewEventNames } from "@here/harp-mapview";

const app = new View({
    canvas: document.getElementById("map") as HTMLCanvasElement
});

const mapView = app.mapView;

const options = { tilt: 45, distance: 3000 };
const coordinates = new GeoCoordinates(1.278676, 103.850216);
let azimuth = 300;
mapView.addEventListener(MapViewEventNames.Render, () => {
    mapView.lookAt(coordinates, options.distance, options.tilt, (azimuth += 0.1))
});
mapView.beginAnimation();


// make map full-screen
mapView.resize(window.innerWidth, window.innerHeight);

// react on resize events from the browser.
window.addEventListener("resize", () => {
    mapView.resize(window.innerWidth, window.innerHeight);
});

// center the camera to New York
mapView.lookAt(new GeoCoordinates(40.70398928, -74.01319808), 1500, 40, 0);

// make sure the map is rendered
mapView.update();

This code and mapView.addEventListener works for me properly without any errors.

Please check your hardware, Operation System, browser version.

Please test all examples on http://harp.gl.s3-website-us-east-1.amazonaws.com/docs/master/examples/ on your device and others.