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189 lines
5.0 KiB
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189 lines
5.0 KiB
Plaintext
===================
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GeoDjango Forms API
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===================
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.. module:: django.contrib.gis.forms
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:synopsis: GeoDjango forms API.
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GeoDjango provides some specialized form fields and widgets in order to visually
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display and edit geolocalized data on a map. By default, they use
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`OpenLayers`_-powered maps, with a base WMS layer provided by `NASA`_.
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.. _OpenLayers: https://openlayers.org/
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.. _NASA: https://earthdata.nasa.gov/
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Field arguments
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===============
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In addition to the regular :ref:`form field arguments <core-field-arguments>`,
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GeoDjango form fields take the following optional arguments.
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``srid``
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--------
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.. attribute:: Field.srid
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This is the SRID code that the field value should be transformed to. For
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example, if the map widget SRID is different from the SRID more generally
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used by your application or database, the field will automatically convert
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input values into that SRID.
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``geom_type``
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-------------
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.. attribute:: Field.geom_type
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You generally shouldn't have to set or change that attribute which should
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be setup depending on the field class. It matches the OpenGIS standard
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geometry name.
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Form field classes
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==================
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``GeometryField``
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-----------------
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.. class:: GeometryField
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``PointField``
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--------------
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.. class:: PointField
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``LineStringField``
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-------------------
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.. class:: LineStringField
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``PolygonField``
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----------------
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.. class:: PolygonField
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``MultiPointField``
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-------------------
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.. class:: MultiPointField
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``MultiLineStringField``
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------------------------
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.. class:: MultiLineStringField
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``MultiPolygonField``
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---------------------
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.. class:: MultiPolygonField
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``GeometryCollectionField``
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---------------------------
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.. class:: GeometryCollectionField
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Form widgets
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============
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.. module:: django.contrib.gis.forms.widgets
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:synopsis: GeoDjango widgets API.
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GeoDjango form widgets allow you to display and edit geographic data on a
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visual map.
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Note that none of the currently available widgets supports 3D geometries, hence
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geometry fields will fallback using a simple ``Textarea`` widget for such data.
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Widget attributes
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-----------------
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GeoDjango widgets are template-based, so their attributes are mostly different
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from other Django widget attributes.
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.. attribute:: BaseGeometryWidget.geom_type
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The OpenGIS geometry type, generally set by the form field.
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.. attribute:: BaseGeometryWidget.map_height
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.. attribute:: BaseGeometryWidget.map_width
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Height and width of the widget map (default is 400x600).
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.. attribute:: BaseGeometryWidget.map_srid
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SRID code used by the map (default is 4326).
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.. attribute:: BaseGeometryWidget.display_raw
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Boolean value specifying if a textarea input showing the serialized
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representation of the current geometry is visible, mainly for debugging
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purposes (default is ``False``).
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.. attribute:: BaseGeometryWidget.supports_3d
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Indicates if the widget supports edition of 3D data (default is ``False``).
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.. attribute:: BaseGeometryWidget.template_name
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The template used to render the map widget.
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You can pass widget attributes in the same manner that for any other Django
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widget. For example::
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from django.contrib.gis import forms
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class MyGeoForm(forms.Form):
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point = forms.PointField(widget=
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forms.OSMWidget(attrs={'map_width': 800, 'map_height': 500}))
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Widget classes
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--------------
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``BaseGeometryWidget``
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.. class:: BaseGeometryWidget
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This is an abstract base widget containing the logic needed by subclasses.
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You cannot directly use this widget for a geometry field.
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Note that the rendering of GeoDjango widgets is based on a template,
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identified by the :attr:`template_name` class attribute.
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``OpenLayersWidget``
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.. class:: OpenLayersWidget
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This is the default widget used by all GeoDjango form fields.
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``template_name`` is ``gis/openlayers.html``.
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``OpenLayersWidget`` and :class:`OSMWidget` use the ``openlayers.js`` file
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hosted on the ``cdnjs.cloudflare.com`` content-delivery network. You can
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subclass these widgets in order to specify your own version of the
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``OpenLayers.js`` file `tailored to your needs`_ in the ``js`` property of
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the inner ``Media`` class (see :ref:`assets-as-a-static-definition`).
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.. _tailored to your needs: https://openlayers.org/en/latest/doc/tutorials/custom-builds.html
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``OSMWidget``
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.. class:: OSMWidget
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This widget uses an OpenStreetMap base layer to display geographic objects
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on. Attributes are:
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.. attribute:: template_name
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``gis/openlayers-osm.html``
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.. attribute:: default_lat
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.. attribute:: default_lon
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The default center latitude and longitude are ``47`` and ``5``,
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respectively, which is a location in eastern France.
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.. attribute:: default_zoom
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The default map zoom is ``12``.
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The :class:`OpenLayersWidget` note about JavaScript file hosting above also
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applies here. See also this `FAQ answer`_ about ``https`` access to map
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tiles.
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.. _FAQ answer: https://help.openstreetmap.org/questions/10920/how-to-embed-a-map-in-my-https-site
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