TypeError: L.Control.Draw is not a constructor

Question

I wanted to draw a polygon in the leaflet map in my ionic2 app, for that I found leaflet-draw pluggin, but I am getting this error TypeError: L.Control.Draw is not a constructor

My code looks this

this.map = L
  .map("map")
  .setView(this.latLng, 13)
  .on("click", this.onMapClicked.bind(this))

L.tileLayer("https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png")
  .addTo(this.map);

this.marker = L
  .marker(this.latLng, { draggable: true })
  .on("dragend", this.onMarkerPositionChanged.bind(this))
  .addTo(this.map);

var drawnItems = new L.FeatureGroup();
this.map.addLayer(drawnItems);
console.log(drawnItems);
var drawControl = new L.Control.Draw({

  edit: {
    featureGroup: drawnItems
  }
});
this.map.addControl(drawControl);

Answer 1

You need add to head html CDN's

<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/leaflet.draw/0.4.2/leaflet.draw.css"/>
<script src="https://cdnjs.cloudflare.com/ajax/libs/leaflet.draw/0.4.2/leaflet.draw.js"></script>

and add to map { drawControl: true }

var map = L.map('mapid', { drawControl: true }).setView([25, 25], 2);

Answer 2

You can get the latest version of leaflet.draw from the following address

https://cdnjs.com/libraries/leaflet.draw

Version 1.0.4

https://cdnjs.cloudflare.com/ajax/libs/leaflet.draw/1.0.4/leaflet.draw.css
https://cdnjs.cloudflare.com/ajax/libs/leaflet.draw/1.0.4/leaflet.draw.js

Answer 3

Hi To add leaflet draw into the Ionic or Angular application need to follow a few steps. Hope you have already installed the leaflet.

1. npm install leaflet-draw
2. include leaflet.draw.css file in the angular.json file.
3. import leaflet-draw in your angular component.

Answer 4

For anyone who uses NPM and TypeScript
(Basically, the problem is that you are missing the Leaflet-Draw library)

Install packages and types

$ npm i -S leaflet
$ npm i -S leaflet-draw
$ npm i -D @types/leaflet
$ npm i -D @types/leaflet-draw

Update your tsconfig.json

{
  "compilerOptions": {
    ...
    types: [
      "leaflet",
      "leaflet-draw",
      ...
    ]
}