from django.conf import settings from django.template.loader import render_to_string # The default Google Maps URL (for the API javascript) # TODO: Internationalize for Japan, UK, etc. GOOGLE_MAPS_URL='http://maps.google.com/maps?file=api&v=%s&key=' class GoogleMapException(Exception): pass class GoogleMap(object): "A class for generating Google Maps javascript." # String constants onunload = 'onunload="GUnload()"' # Cleans up after Google Maps vml_css = 'v\:* {behavior:url(#default#VML);}' # CSS for IE VML xmlns = 'xmlns:v="urn:schemas-microsoft-com:vml"' # XML Namespace (for IE VML). def __init__(self, key=None, api_url=None, version=None, center_lat=0.0, center_lon=0.0, zoom=1, dom_id='map', load_func='gmap_load', kml_urls=[], template='gis/google/js/google-map.js', extra_context={}): # The Google Maps API Key defined in the settings will be used # if not passed in as a parameter. The use of an API key is # _required_. if not key: try: self._key = settings.GOOGLE_MAPS_API_KEY except AttributeError: raise GoogleMapException, 'Google Maps API Key not found (try adding GOOGLE_MAPS_API_KEY to your settings).' else: self._key = key # Getting the Google Maps API version, defaults to using the latest ("2.x"), # this is not necessarily the most stable. if not version: try: self._version = settings.GOOGLE_MAPS_API_VERSION except AttributeError: self._version = '2.x' else: self._version = version # Can specify the API URL in the `api_url` keyword. if not api_url: try: self._url = settings.GOOGLE_MAPS_URL % self._version except AttributeError: self._url = GOOGLE_MAPS_URL % self._version else: self._url = api_url # Setting the DOM id of the map, the center lat/lon, the load function, # and the zoom. self.dom_id = dom_id self.center_lat = center_lat self.center_lon = center_lon self.load_func = load_func self.template = template self.zoom = zoom # Setting the parameters for the javascript template. params = {'center_lat' : center_lat, 'center_lon' : center_lon, 'dom_id' : dom_id, 'kml_urls' : kml_urls, 'load_func' : load_func, 'zoom' : zoom, } params.update(extra_context) self.js = render_to_string(template, params) @property def body(self): "Returns HTML body tag for loading and unloading Google Maps javascript." return '' % (self.onload, self.onunload) @property def onload(self): "Returns the `onload` HTML attribute." return 'onload="%s()"' % self.load_func @property def api_script(self): "Returns the ' % (self._url, self._key) @property def scripts(self): "Returns all tags required for Google Maps JavaScript." return '%s\n ' % (self.api_script, self.js) @property def style(self): "Returns additional CSS styling needed for Google Maps on IE." return '' % self.vml_css @property def xhtml(self): "Returns XHTML information needed for IE VML overlays." return '' % self.xmlns