GeoDjango Forms API¶

srid¶

Field.srid¶

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_type¶

Field.geom_type¶

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

GeometryField¶

class GeometryField[source]¶

PointField¶

class PointField[source]¶

LineStringField¶

class LineStringField[source]¶

PolygonField¶

class PolygonField[source]¶

MultiPointField¶

class MultiPointField[source]¶

MultiLineStringField¶

class MultiLineStringField[source]¶

MultiPolygonField¶

class MultiPolygonField[source]¶

GeometryCollectionField¶

class GeometryCollectionField[source]¶

Widget attributes¶

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

BaseGeometryWidget.base_layer¶

New in Django Development version.

A string that specifies the identifier for the default base map layer to be used by the corresponding JavaScript map widget. It is passed as part of the widget options when rendering, allowing the MapWidget to determine which map tile provider or base layer to initialize (default is None).

BaseGeometryWidget.geom_type¶

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

BaseGeometryWidget.map_srid¶

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

BaseGeometryWidget.display_raw¶

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_3d¶

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

BaseGeometryWidget.template_name¶

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={"display_raw": True}))

Widget classes¶

BaseGeometryWidget

class BaseGeometryWidget[source]¶

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 base layer name, identified by the base_layer class attribute.

OpenLayersWidget

class OpenLayersWidget[source]¶

This is the default widget used by all GeoDjango form fields. Attributes are:

base_layer¶

New in Django Development version.

nasaWorldview

template_name¶

gis/openlayers.html.

map_srid¶

3857

OpenLayersWidget and OSMWidget include the ol.js and ol.css files hosted on the cdn.jsdelivr.net content-delivery network. These files can be overridden by subclassing the widget and setting the js and css properties of the inner Media class (see Assets as a static definition).

External assets with CSP

When ContentSecurityPolicyMiddleware is enabled, the default OpenLayers CDN assets (ol.js and ol.css) will be blocked unless explicitly allowed. This can be addressed in one of two ways: serve assets locally by subclassing the widget and provide local copies of the JavaScript and CSS files, or allow the CDN in the CSP policy.

For example, to allow the default NASA Worldview base layer (replace x.y.z with the actual version):

from django.utils.csp import CSP

SECURE_CSP = {
    "default-src": [CSP.SELF],
    "script-src": [CSP.SELF, "https://cdn.jsdelivr.net/npm/[email protected]/dist/ol.js"],
    "style-src": [CSP.SELF, "https://cdn.jsdelivr.net/npm/[email protected]/ol.css"],
    "img-src": [CSP.SELF, "https://*.earthdata.nasa.gov"],
}

OSMWidget

class OSMWidget[source]¶

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

base_layer¶

New in Django Development version.

osm

default_lat¶

default_lon¶

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

default_zoom¶

The default map zoom is 12.

The OpenLayersWidget note about using external assets also applies here. See also this FAQ answer about https access to map tiles.

OpenStreetMap tiles with CSP

This widget uses OpenStreetMap tiles instead of NASA Worldview. If Content Security Policy enabled, both the OpenLayers CDN resources (as required by OpenLayersWidget) and the OpenStreetMap tile servers must be allowed:

from django.utils.csp import CSP

SECURE_CSP = {
    # other directives
    "img-src": [CSP.SELF, "https://tile.openstreetmap.org"],
}

Changed in Django Development version:

The OSMWidget no longer uses a custom template. Consequently, the gis/openlayers-osm.html template was removed.

Customizing the base layer used in OpenLayers-based widgets¶

To customize the base layer displayed in OpenLayers-based geometry widgets, define a new layer builder in a custom JavaScript file. For example:

 MapWidget.layerBuilder.custom_layer_name = function () {
     // Return an OpenLayers layer instance.
     return new ol.layer.Tile({source: new ol.source.<ChosenSource>()});
 };

Then, subclass a standard geometry widget and set the base_layer:

from django.contrib.gis.forms.widgets import OpenLayersWidget


class YourCustomWidget(OpenLayersWidget):
    base_layer = "custom_layer_name"

    class Media:
        js = ["path-to-file.js"]