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Leaflet Map WordPress Plugin

Leaflet WordPress

Header Image

Add a map generated with LeafletJS: an open-source JavaScript library for mobile-friendly interactive maps. Map tiles are provided by default through OpenStreetMap, or MapQuest (with an app key). Can be set per map with shortcode attributes or through the dashboard settings.

Admin Screenshot

Table of Contents

Installation

  • Install via the WordPress plugins page on your WordPress site: /wp-admin/plugin-install.php (search Leaflet)

General Usage

[leaflet-map address="Manhattan, New York"]
[leaflet-marker]

The above shortcode will produce a map centered at Manhattan, New York (thanks to geocoding), and also drop a marker in the center.

It's also useful to add popups to the markers:

[leaflet-map address="Las Vegas"]
[leaflet-marker]Hey! This is where I got married![/leaflet-marker]

You can have SVG markers, add shapes, geojson, kml, images, and more! See available shortcodes below.

Developing

This plugin uses Docker for development. Simply:

  1. install Docker
  2. fork/clone the repo, and
  3. execute this command from the repo's root directory in your terminal:
docker-compose up

You can also use NPM scripts to interact with Docker, if you make changes to Docker-related files:

To start:

npm start

To completely remove:

npm run destroy

That's all for now! Thanks!

Available Shortcodes

[leaflet-map]

Alternate map tiles

Height, width, latitude, longitude and zoom are the basic attributes:

[leaflet-map height=250 width=250 lat=44.67 lng=-63.61 zoom=5]

However, you can also just give it an address, and the chosen geocoder (default: Nominatum) will look it up for you:

[leaflet-map address="Oslo, Norway"]

[leaflet-map] Options:

Option Default
lat and lng or address lat: 44.67, lng: -63.61
zoom 12
height 250
width 100%
fitbounds 0 (false)
zoomcontrol 0 (false)
scrollwheel 0 (false)
doubleclickzoom 0 (false)
min_zoom 0
max_zoom 20
subdomains abc
attribution ©Leaflet ©OpenStreetMap
closepopuponclick false
trackresize false
boxZoom true
dragging true
keyboard true
maxbounds null
detect-retina 0 (false)
tileurl 'https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png'
subdomains 'abc'
tap true
tilesize 256
mapid null
accesstoken null
zoomoffset 0
nowrap false

[leaflet-image]

Much the same as leaflet-map above, but uses src for the source image.

TBH, it's a huge mess, and probably shouldn't be used. It might make a good image viewer with optional marker highlight points. It requires far too much manual work at the moment. Recommended usage:

[leaflet-image src="path/to/img.jpg" zoom=1]
[leaflet-marker draggable]

Then in the console, check the coordinates when you move the marker (should only work at that zoom level).

[leaflet-image] Options:

Option Default
src https://picsum.photos/1000/1000/
zoom 12
height 250
width 100%
fitbounds 0 (false)
zoomcontrol 0 (false)
scrollwheel 0 (false)
doubleclickzoom 0 (false)
min_zoom 0
max_zoom 20
attribution ©Leaflet ©OpenStreetMap

[leaflet-marker]

Markers with HTML within a popup

Add a marker to any map by adding [leaflet-marker] after any [leaflet-map] shortcode. You can adjust the lat/lng in the same way, as well as some other basic functionality (popup message, draggable, visible on load). Also, if you want to add a link to a marker popup, use [leaflet-marker]Message here: click here[/leaflet-marker] and add a link like you normally would with the WordPress editor.

[leaflet-marker] Options:

Option Usage
lat and lng or address Location on the map; defaults to map center; lat/lng are floats, address is a string
draggable Make a marker draggable (boolean); default false
title Add a hover-over message to your marker (different than popup)
alt Add an alt text to the marker image
zindexoffset Define the z-index for the marker image
opacity Define the css opacity for the marker image
iconurl Give a url for the marker image file
iconsize Set the size of the icon: e.g. "80,50" for 80px width 50px height
iconanchor Set the anchor position of the icon: e.g. "40,60" for 40px left 60px top
shadowurl Give a url for the marker shadow image file
shadowsize Set the size of the shadow: e.g. "80,50" for 80px width 50px height
shadowanchor Set the anchor position of the shadow: e.g. "40,60" for 40px left 60px top
popupanchor Set the anchor position of the popup: e.g. "40,60" for 40px left 60px top
svg Boolean for whether the marker should be created as an svg: default false
background Background color for an SVG marker (above)
color color of the SVG marker (above)
iconclass className for the marker image

[leaflet-line]

Fitted Colored Line

Add a line to the map by adding [leaflet-line]. You can specify the postions with a list separated by semi-colon ; or bar | using lat/lng: [leaflet-line latlngs="41, 29; 44, 18"] or addresses: [leaflet-line addresses="Istanbul; Sarajevo"], or x/y coordinates for image maps.

Add a popup to the line by adding text to the content of the shortcode:

[leaflet-line addresses="new york; chicago"]New York to Chicago[/leaflet-line]

[leaflet-line] Options

Option Usage
addresses, latlngs, or coordinates For geocoded addresses, latitude/longitude, or x/y coordinates for Image Maps; ex: [leaflet-line latlngs="41, 29; 44, 18"] or addresses: [leaflet-line addresses="Istanbul; Sarajevo"]
fitbounds Fit the map to the bounds of the line (instead of whatever center you gave the map originally)

And the following Shape Options. See https://leafletjs.com/reference-1.3.4.html#path for details. 'stroke', 'color', 'weight', 'opacity', 'lineCap', 'lineJoin', 'dashArray', 'dashOffset' 'fill', 'fillColor', 'fillOpacity', 'fillRule', 'className'


[leaflet-polygon]

Virtually the same as leaflet-line


[leaflet-circle]

Circle

Add a circle to the map by adding [leaflet-circle]. You can specify the position using lat and lng and the radius in meters using radius. You can also customize the style using Leaflet's Path options. Example: [leaflet-circle message="max distance" lng=5.1179 lat=52.0979 radius=17500 color="#0DC143" fillOpacity=0.1].

[leaflet-circle] Options

Options Usage
address, lat/lng, or x/y For geocoded addresses, latitude/longitude, or x/y coordinates for Image Maps (see [leaflet-image]); ex: [leaflet-circle lat=52 lng=5] or addresses: [leaflet-circle address="Amsterdam"]
fitbounds Fit the map to the bounds of the circle (instead of whatever center you gave the map originally)
radius Radius of the circle in meters

Includes all style options: See https://leafletjs.com/reference-1.3.4.html#path


[leaflet-geojson]

Random GeoJSON created by me

Or you can add a geojson shape via a url:

[leaflet-geojson src="https://gist.githubusercontent.com/bozdoz/064a7101b95a324e8852fe9381ab9a18/raw/03f4f54b13a3a7e256732760a8b679818d9d36fc/map.geojson"]

[leaflet-geojson] Options

Option Usage
src Source of the geojson file
popup_text Text for any popups when shapes are clicked
popup_property Name of the geojson property that contains popup content
fitbounds Fit the map to the bounds of all shapes (instead of whatever center you gave the map originally)
circleMarker Display circles instead of markers. Vastly improves performance on maps with a lot of points.
radius Radius of the circles, when circleMarkers is set
table-view Show all properties on each feature when clicked
iconurl Give a url for the marker image file
iconsize Set the size of the icon: e.g. "80,50" for 80px width 50px height
iconanchor Set the anchor position of the icon: e.g. "40,60" for 40px left 60px top
popupanchor Set the anchor position of the popup: e.g. "40,60" for 40px left 60px top

Includes all style options: See https://leafletjs.com/reference-1.3.4.html#path. Also, if you want to add feature properties to the popups, use the inner content and curly brackets to substitute the values: [leaflet-geojson]Field A = {field_a}[/leaflet-geojson].

[leaflet-kml]

Same idea as geojson (above), but takes KML files and loads Mapbox's togeojson library

[leaflet-gpx]

Same idea as geojson and KML (above), but takes GPX files and also loads Mapbox's togeojson library

[leaflet-scale]

Can be added after any map, or enabled for all maps in the admin. If you want to extend it, you can extend window.WPLeafletMapPlugin.createScale with custom JavaScript.

Option Default
maxWidth 100
metric 1 (true)
imperial 1 (true)
updateWhenIdle 0 (false)
position topright

Frequently Asked Questions

How Can I Add another Leaflet Plugin?

There are some steps you can take, currently, to add another Leaflet Plugin to enhance this WordPress plugin. In general, you can add an action to trigger when Leaflet is loaded, and add custom JavaScript and any dependencies your plugin needs:

Here's an example with MapBox Fullscreen plugin:

functions.php

add_action('leaflet_map_loaded', 'fs_leaflet_loaded');
function fs_leaflet_loaded() {
  wp_enqueue_script('full_screen_leaflet', 'https://api.mapbox.com/mapbox.js/plugins/leaflet-fullscreen/v1.0.1/Leaflet.fullscreen.min.js', Array('wp_leaflet_map'), '1.0', true);
  wp_enqueue_style('full_screen_leaflet_styles', 'https://api.mapbox.com/mapbox.js/plugins/leaflet-fullscreen/v1.0.1/leaflet.fullscreen.css');

  // custom js
  wp_enqueue_script('full_screen_custom', get_theme_file_uri( '/js/full-screen.js' ), Array('full_screen_leaflet'), '1.0', true);
}

/js/full-screen.js

(function () {
  function main() {
    if (!window.WPLeafletMapPlugin) {
      console.log('no plugin found!');
      return;
    }

    // iterate any of these arrays: `maps`, `markers`, `lines`, `circles`, `geojsons`
    var maps = window.WPLeafletMapPlugin.maps;
    
    // Note: `markergroups` is an *object*. If you'd like to iterate it, you can do it like this:
    // var markergroups = window.WPLeafletMapPlugin.markergroups;
    // var keys = Object.keys(markergroups);
    // for (var i = 0, len = keys.length; i < len; i++) {
    //   var markergroup = markergroups[keys[i]];
    // }

    for (var i = 0, len = maps.length; i < len; i++) {
      var map = maps[i];
      map.whenReady(function () {
        this.addControl(new L.Control.Fullscreen());
      });
    }
  }

  window.addEventListener('load', main);
})();

Contributing

View Contribution guidelines

Wish List

  • A map editor/shortcode generator (so users can see what they're adding to the page)