django-osm-field

Contents:

Installation

Install django-osm-field into your virtual environment or you site-packages using pip:

$ pip install django-osm-field

To make django-osm-field available in your Django project, you first have to add it to the INSTALLED_APPS in your settings.py. If you are unsure where to put it, just append it:

INSTALLED_APPS = (
    ...
    'osm_field',
    ...
)

Usage

Model Layer

You need to add three model fields to your model:

  1. OSMField
  2. LatitudeField
  3. LongitudeField

django-osm-field expects them to have a certain name schema: The OSMField defines the base name, the LatitudeField and LongitudeField have the same name appended with _lat and _lon respectively. See the following example to get an idea:

from django.db import models

from osm_field.fields import LatitudeField, LongitudeField, OSMField


class MyModel(models.Model):
    location = OSMField()
    location_lat = LatitudeField()
    location_lon = LongitudeField()

It is possible, though, to overwrite the default naming for latitude and longitude fields by giving their names as arguments to the OSMField:

class MyModel(models.Model):
    location = OSMField(lat_field='latitude', lon_field='longitude')
    latitude = LatitudeField()
    longitude = LongitudeField()

Form Layer

from django import forms

from .models import MyModel


class MyModelForm(forms.ModelForm):

    class Meta:
        fields = ('location', 'location_lat', 'location_lon', )
        model = MyModel

View Layer

from django.views.generic import CreateView

from .forms import MyModelForm
from .models import MyModel


class MyCreateView(CreateView):
    form_class = MyModelForm
    model = MyModel

Template Layer

django-osm-field shipps with a minimized jQuery version. To access it in a template use the static templatetag from the staticfiles Django app:

<script type="text/javascript" src="{% static "js/vendor/jquery-2.1.0.min.js" %}"></script>

You can of course load jQuery from a CDN as well:

<script type="text/javascript" src="//code.jquery.com/jquery-2.1.0.min.js"></script>

To get the front-end to work, you also need to include some CSS and JavaScript files. You can do this by simply using {{ form.media }} or by adding those lines explicitly:

<link href="{% static "css/vendor/leaflet.css" %}" type="text/css" media="screen" rel="stylesheet" />
<link href="{% static "css/osm_field.css" %}" type="text/css" media="screen" rel="stylesheet" />
<script type="text/javascript" src="{% static "js/vendor/leaflet.js" %}"></script>
<script type="text/javascript" src="{% static "js/osm_field.js" %}"></script>

In the end your template should look similar to this:

{% load static from staticfiles %}<!DOCTYPE HTML>
<html>
  <head>
    <title></title>
    <link rel="stylesheet" href="{% static "css/example.css" %}">
    <!-- Either serve jQuery yourself -->
    <script type="text/javascript" src="{% static "js/vendor/jquery-2.1.0.min.js" %}"></script>
    <!-- or from a CDN -->
    <script type="text/javascript" src="//code.jquery.com/jquery-2.1.0.min.js"></script>
  </head>
  <body>
    {{ form.media }}
    <form action="" method="post">
      {% csrf_token %}
      {{ form.as_p }}
      <input type="submit" value="Save" />
    </form>
  </body>
</html>

Credits

Contributors

  • Sascha Narr

Project has been started by Sinnwerkstatt Medienagentur GmbH in April 2014.

History

0.2.0 (2014-11-10)

  • Added support for Django 1.7 migrations (#2)
  • Updated styling (#1)
  • Forced map refresh on show
  • Added tests
  • Changed license from BSD to MIT
  • Added support for non-default named form fields (those not ending with _lat and _lon respectively).
  • Added documentation

0.1.4 (2014-06-02)

  • Add minified JavaScript and CSS sources

0.1.3 (2014-05-28)

  • jQuery is not automatically added by the widgets media class anymore

0.1.0 (2014-05-20)

  • First release on PyPI.

References

Fields

OSMField

class osm_field.fields.OSMField(*args, **kwargs)

Bases: django.db.models.TextField

Parameters:
  • lat_field (str) – The name of the latitude field. None (and thus standard behavior) by default.
  • lon_field (str) – The name of the longitude field. None (and thus standard behavior) by default.

All default field options.

formfield(**kwargs)
Returns:A CharField with a OSMWidget.
latitude_field_name

The name of the related LatitudeField.

longitude_field_name

The name of the related LongitudeField.

LatitudeField

class osm_field.fields.LatitudeField(*args, **kwargs)

Bases: django.db.models.FloatField

All default field options.

The validators parameter will be appended with validate_latitude() if not already present.

formfield(**kwargs)
Returns:A FloatField with max_value 90 and min_value -90.

LongitudeField

class osm_field.fields.LongitudeField(*args, **kwargs)

Bases: django.db.models.FloatField

All default field options.

The validators parameter will be appended with validate_longitude() if not already present.

formfield(**kwargs)
Returns:A FloatField with max_value 180 and min_value -180.

Utilities

Location
class osm_field.fields.Location(lat, lon, text)

A wrapper class bundling the description of a location (text) and its geo coordinates, latitude (lat) and longitude (lon).

Parameters:
  • lat (float) – The latitude
  • lon (float) – The longitude
  • str – The description

Forms

OSMWidget

class osm_field.forms.OSMWidget(lat_field, lon_field, attrs=None)

Bases: django.forms.widgets.TextInput

Adds a OpenStreetMap Leaflet dropdown map to the front-end once the user focuses the form field. See the usage chapter on how to integrate the CSS and JavaScript code.

Validators

validate_latitude

osm_field.fields.validate_latitude(value)

Validates that the given value does not exceed the range [-90, 90].

Raises:Raises a ValidationError if value is not within the range.

validate_longitude

osm_field.fields.validate_longitude(value)

Validates that the given value does not exceed the range [-180, 180].

Raises:Raises a ValidationError if value is not within the range.

Indices and tables