blechreiz-website/location_field/widgets.py

from django.forms import widgets
from django.utils.safestring import mark_safe
from django.conf import settings
import os


class LocationWidget(widgets.TextInput):
    def __init__(self, attrs=None, based_field=None, zoom=None, width=610, height=480, **kwargs):
        self.based_field = based_field
        self.zoom = zoom
        self.width = width
        self.height = height
        super(LocationWidget, self).__init__(attrs)

    def render(self, name, value, attrs=None, renderer=None):

        if value is not None and len(value) > 0:
            lat, lng, zoom = value.split(',')

            value = '%s,%s,%d' % (
                float(lat),
                float(lng),
                float(zoom)
            )
        else:
            value = ''

        based_field = "#id_" + self.based_field.name

        attrs = attrs or {}
        attrs['readonly'] = "readonly"
        attrs['data-location-widget'] = name
        attrs['data-based-field'] = based_field
        attrs['data-zoom'] = self.zoom
        attrs['data-map'] = '#map_' + name
        attrs['data-dialog-id'] = "#map_dialog_" + name
        text_input = super(LocationWidget, self).render(name, value, attrs)

        path = os.path.abspath(os.path.dirname(__file__))
        with open(path + "/media/form.html", 'r') as content_file:
            html = content_file.read()

        return mark_safe(text_input + html % {'name': name, 'width': self.width, 'height': self.height})

    class Media:
        css = {
            'all': ('/location_field/media/form.css',)
        }
        # Use schemaless URL so it works with both, http and https websites
        js = (
            '//maps.google.com/maps/api/js?sensor=false&language=de&key={}'.format(settings.GOOGLE_MAPS_API_KEY),
            '/static/js/bindWithDelay.js',
            '/location_field/media/form.js',
        )