GeoDjango Forms APIP

GeoDjango provides some specialized form fields and widgets in order to visually display and edit geolocalized data on a map. By default, they use OpenLayers-powered maps, with a base WMS layer provided by NASA.

Field argumentsP

In addition to the regular form field arguments, GeoDjango form fields take the following optional arguments.

sridP

Field.sridP

This is the SRID code that the field value should be transformed to. For example, if the map widget SRID is different from the SRID more generally used by your application or database, the field will automatically convert input values into that SRID.

geom_typeP

Field.geom_typeP

You generally shouldn't have to set or change that attribute which should be setup depending on the field class. It matches the OpenGIS standard geometry name.

Form field classesP

GeometryFieldP

class GeometryFieldP

PointFieldP

class PointFieldP

LineStringFieldP

class LineStringFieldP

PolygonFieldP

class PolygonFieldP

MultiPointFieldP

class MultiPointFieldP

MultiLineStringFieldP

class MultiLineStringFieldP

MultiPolygonFieldP

class MultiPolygonFieldP

GeometryCollectionFieldP

class GeometryCollectionFieldP

Form widgetsP

GeoDjango form widgets allow you to display and edit geographic data on a visual map. Note that none of the currently available widgets supports 3D geometries, hence geometry fields will fallback using a simple Textarea widget for such data.

Widget attributesP

GeoDjango widgets are template-based, so their attributes are mostly different from other Django widget attributes.

BaseGeometryWidget.geom_typeP

The OpenGIS geometry type, generally set by the form field.

BaseGeometryWidget.map_heightP
BaseGeometryWidget.map_widthP

Height and width of the widget map (default is 400x600).

BaseGeometryWidget.map_sridP

SRID code used by the map (default is 4326).

BaseGeometryWidget.display_rawP

Boolean value specifying if a textarea input showing the serialized representation of the current geometry is visible, mainly for debugging purposes (default is False).

BaseGeometryWidget.supports_3dP

Indicates if the widget supports edition of 3D data (default is False).

BaseGeometryWidget.template_nameP

The template used to render the map widget.

You can pass widget attributes in the same manner that for any other Django widget. For example:

from django.contrib.gis import forms

class MyGeoForm(forms.Form):
    point = forms.PointField(widget=
        forms.OSMWidget(attrs={'map_width': 800, 'map_height': 500}))

Widget classesP

BaseGeometryWidget

class BaseGeometryWidgetP

This is an abstract base widget containing the logic needed by subclasses. You cannot directly use this widget for a geometry field. Note that the rendering of GeoDjango widgets is based on a template, identified by the template_name class attribute.

OpenLayersWidget

class OpenLayersWidgetP

This is the default widget used by all GeoDjango form fields. template_name is gis/openlayers.html.

OpenLayersWidget and OSMWidget use the openlayers.js file hosted on the cdnjs.cloudflare.com content-delivery network. You can subclass these widgets in order to specify your own version of the OpenLayers.js file in the js property of the inner Media class (see 资源作为静态定义).

OSMWidget

class OSMWidgetP

This widget uses an OpenStreetMap base layer to display geographic objects on. Attributes are:

template_nameP

gis/openlayers-osm.html

default_latP
default_lonP

The default center latitude and longitude are 47 and 5, respectively, which is a location in eastern France.

default_zoomP

The default map zoom is 12.

The OpenLayersWidget note about JavaScript file hosting above also applies here. See also this FAQ answer about https access to map tiles.

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