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Use Leaflet in your Django projects

README.rst

django-leaflet allows you to use Leaflet in your Django projects.

It embeds Leaflet in version 0.7.2.

https://pypip.in/v/django-leaflet/badge.png https://pypip.in/d/django-leaflet/badge.png https://travis-ci.org/makinacorpus/django-leaflet.png https://coveralls.io/repos/makinacorpus/django-leaflet/badge.png

Main purposes of having a python package for the Leaflet Javascript library :

  • Install and enjoy ;
  • Do not embed Leaflet assets in every Django project ;
  • Enjoy geometry edition with Leaflet form widget ;
  • Control apparence and settings of maps from Django settings (e.g. at deployment) ;
  • Reuse Leaflet map initialization code (e.g. local projections) ;
note: django-leaflet is compatible with django-geojson fields, which allow handling geographic data without spatial database.

INSTALL

Last stable version:

pip install django-leaflet

Last development version (master branch):

pip install -e git+https://github.com/makinacorpus/django-leaflet.git#egg=django-leaflet

USAGE

  • Add leaflet to your INSTALLED_APPS

  • Make sure django.contrib.staticfiles is also in your INSTALLED_APPS; Django >= 1.3 includes this contrib app by default

  • Add the HTML header:

    {% load leaflet_tags %}
    
    <head>
        ...
        {% leaflet_js %}
        {% leaflet_css %}
    </head>
    
  • Add the map in your page, providing a name:

    ...
    <body>
        ...
        {% leaflet_map "yourmap" %}
        ...
    </body>
    
  • Your map shows up!

Use Leaflet API

You can use the Leaflet API as usual. There are two ways to grab a reference on the just initialized map and options.

Using Javascript callback function

The easy way :

<script type="text/javascript">
    function map_init_basic (map, options) {
        ...
        L.marker([50.5, 30.5]).addTo(map);
        ...
    }
</script>

{% leaflet_map "yourmap" callback="window.map_init_basic" %}

Using events

If you don't want to expose global callbacks :

<script type="text/javascript">
    window.addEventListener("map:init", function (e) {
        var detail = e.detail;
        ...
        L.marker([50.5, 30.5]).addTo(detail.map);
        ...
    }, false);
</script>

Event object has two properties : map and options (initialization).

For Internet Explorer support, we fallback on jQuery if available

$(window).on('map:init', function (e) {
    var detail = e.originalEvent ?
                 e.originalEvent.detail : e.detail;
    ...
    L.marker([50.5, 30.5]).addTo(detail.map);
    ...
});

If you want to support archaic browsers and still avoid jQuery, django-leaflet comes with a minimalist polyfill for events. Add it in <head> this way

<!--[if IE 8]><script src="{% static "leaflet/eventlister.ie8.js" %}"></script><!--<![endif]-->
<!--[if lt IE 8]><script src="{% static "leaflet/eventlister.ie6-7.js" %}"></script><!--<![endif]-->

Customize map size

CSS is your friend:

<style>

    .leaflet-container {  /* all maps */
        width:  600px;
        height: 400px;
    }

    #specialbigmap {
        height: 800px;
    }

</style>

Configuration

In order to configure django-leaflet, just add a new section in your settings:

LEAFLET_CONFIG = {
    # conf here
}

And add some of the following entries.

Spatial extent

You can configure a global spatial extent for your maps, that will automatically center your maps, restrict panning and add reset view and scale controls. (See advanced usage to tweak that.):

'SPATIAL_EXTENT': (5.0, 44.0, 7.5, 46)

Initial map center and zoom level

In addition to limiting your maps with SPATIAL_EXTENT, you can also specify initial map center, default, min and max zoom level:

'DEFAULT_CENTER': (6.0, 45.0),
'DEFAULT_ZOOM': 16,
'MIN_ZOOM': 3,
'MAX_ZOOM': 18,

The tuple/list must contain (lat,lng) coords.

Default tiles layer

To globally add a tiles layer to your maps:

'TILES': 'http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png'

This setting can also be a list of tuples (name, url, attributions).

If it contains several layers, a layer switcher will then be added automatically.

'TILES': [('Satellite', 'http://server/a/...', '© Big eye'),
          ('Streets', 'http://server/b/...', '© Contributors')]

Attribution prefix

To globally add an attribution prefix on maps (most likely an empty string)

'ATTRIBUTION_PREFIX': 'Powered by django-leaflet'

Default is None, which leaves the value to Leaflet's default.

Scale control

Scale control may be set to show 'metric' (m/km), or 'imperial' (mi/ft) scale lines, or 'both'. Default is 'metric'.

Enable metric and imperial scale control:

'SCALE': 'both'

Disable scale control:

'SCALE': None

Minimap control

Shows a small map in the corner which shows the same as the main map with a set zoom offset:

'MINIMAP': True

By default it shows the tiles of the first layer in the list.

(More info...)

Reset view button

By default, a button appears below the zoom controls and, when clicked, shows the entire map. To remove this button, set:

'RESET_VIEW': False

Global initialization functions and window.maps

Since 0.7.0, the leaflet_map template tag no longer registers initialization functions in global scope, and no longer adds map objects into window.maps array by default. To restore these features, use:

'NO_GLOBALS' = False

Plugins

To ease the usage of plugins, django-leaflet allows specifying a set of plugins, that can later be referred to from the template tags by name:

'PLUGINS': {
    'name-of-plugin': {
        'css': ['relative/path/to/stylesheet.css', '/root/path/to/stylesheet.css'],
        'js': 'http://absolute-url.example.com/path/to/script.js',
        'auto-include': True,
    },
    . . .
}

Both 'css' and 'js' support identical features for specifying resource URLs:

  • can be either a plain string or a list of URLs
  • each string can be:
    • absolute URL - will be included as-is; example: http://absolute-url.example.com/path/to/script.js
    • a URL beginning from the root - will be included as-is; example: /root/path/to/stylesheet.css
    • a relative URL - settings.STATIC_URL will be prepended; example: relative/path/to/stylesheet.css will be included as /static/relative/path/to/stylesheet.css (depending on your setting for STATIC_URL)

Now, use leaflet_js and leaflet_css tags to load CSS and JS resources of configured Leaflet plugins.

By default only plugins with 'auto-include' as True will be included.

To include specific plugins in the page, specify plugin names, comma separated:

{% load leaflet_tags %}

<head>
    ...
    {% leaflet_js  plugins="bouncemarker,draw" %}
    {% leaflet_css plugins="bouncemarker,draw" %}
</head>

To include all plugins configured in LEAFLET_CONFIG['PLUGINS'], use:

{% leaflet_js plugins="ALL" %}
{% leaflet_css plugins="ALL" %}

Leaflet map forms widgets

A Leaflet widget is provided to edit geometry fields. It embeds Leaflet.draw in version 0.2.2.

https://f.cloud.github.com/assets/546692/1048836/78b6ad94-1094-11e3-86d8-c3e88626a31d.png

In Adminsite

from django.contrib import admin
from leaflet.admin import LeafletGeoAdmin

from .models import WeatherStation


admin.site.register(WeatherStation, LeafletGeoAdmin)

In forms

With Django >= 1.6:

from django import forms

from leaflet.forms.widgets import LeafletWidget


class WeatherStationForm(forms.ModelForm):

    class Meta:
        model = WeatherStation
        fields = ('name', 'geom')
        widgets = {'geom': LeafletWidget()}

With all Django versions:

from django import forms

from leaflet.forms.fields import PointField


class WeatherStationForm(forms.ModelForm):
    geom = PointField()

    class Meta:
        model = WeatherStation
        fields = ('name', 'geom')

The related template would look like this:

{% load leaflet_tags %}
<html>
  <head>
   {% leaflet_js plugins="forms" %}
   {% leaflet_css plugins="forms" %}
  </head>
  <body>
    <h1>Edit {{ object }}</h1>
    <form action="POST">
        {{ form }}
        <input type="submit"/>
    </form>
  </body>
</html>

Plugins

It's possible to add extras JS/CSS or auto-include forms plugins everywhere:

LEAFLET_CONFIG = {
    'PLUGINS': {
        'forms': {
            'auto-include': True
        }
    }
}

( It will be merged over default minimal set required for edition )

Details

  • It relies on global settings for map initialization.
  • It works with local map projections. But SRID is specified globally through LEAFLET_CONFIG['SRID'] as described below.
  • Javascript component for de/serializing fields value is pluggable.
  • Javascript component for Leaflet.draw behaviour initialization is pluggable.

Advanced usage

{% leaflet_map %} tag parameters

  • callback: javascript function name for initialization callback. (Default: None).
  • fitextent: control if map initial view shoud be set to extent setting. (Default: True). Setting fixextent to False will prevent view reset and scale controls to be added.
  • creatediv: control if the leaflet map tags creates a new div or not. (Default: True). Useful to put the javascript code in the header or footer instead of the body of the html document. If used, do not forget to create the div manually.
  • loadevent: One or more space-separated window events that trigger map initialization. (Default: load, i.e. all page resources loaded). If empty values is provided, then map initialization is immediate. And with a wrong value, the map is never initialized. :)

Projection

It is possible to setup the map spatial reference in LEAFLET_CONFIG:

'SRID': 2154  # See http://spatialreference.org

Additional parameter is required to compute scale levels : the tiles extent in local projection:

'TILES_EXTENT': [924861,6375196,985649,6448688],

For more information, have a look at this example.

Example of TileCache configuration compatible with Leaflet:

[scan-portrait]
type=WMSLayer
layers=scan100,scan25
url=http://server/wms?
extension=jpg
tms_type=google
srs=EPSG:2154
bbox=924861,6375196,985649,6448688

[cache]
type=GoogleDisk
expire=2592000
base=/tmp/tiles

By default, django-leaflet will try to load the spatial reference from your static files at "proj4js/{{ srid }}.js". If it fails, it will eventually rely on spatialreference.org.

TUTORIALS

AUTHORS

makinacom

LICENSE

  • Lesser GNU Public License
  • Leaflet Copyright - 2010-2011 CloudMade, Vladimir Agafonkin
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