Django google maps v3 snipplet [via] admin example (tested in Django 1.4.x) (second example)

admin.py

from <app_name>.models import Foo

# ...

# Using the default admin interface:
admin.site.register(Foo)

fields.py

from django import forms
from django.db import models
from <app_name>.widgets import LocationWidget

class LocationFormField(forms.CharField):
    
    def clean(self, value):
        
        if value is u'' or value is None:
            return None
        
        if isinstance(value, unicode):
            a, b = value.split(',')
        else:
            a, b = value
        
        lat, lng = float(a), float(b)
        return "%f,%f" % (lat, lng)

class LocationField(models.CharField):
    
    def formfield(self, **kwargs):
        defaults = {
            'form_class': LocationFormField
        }
        defaults.update(kwargs)
        defaults['widget'] = LocationWidget
        
        return super(LocationField, self).formfield(**defaults)

models.py

from <app_name>.fields import LocationField

# ...

class Foo(models.Model):
    
    # ...
    
    geolocation = LocationField(_(u'geolocation'), max_length=100)
    
    # ...
    
    @property
    def get_geolocation(self):
        if self.geolocation:
            return self.geolocation.split(',')

widgets.py

from django import forms
from django.db import models
from django.utils.safestring import mark_safe

DEFAULT_WIDTH = 300
DEFAULT_HEIGHT = 200

DEFAULT_LAT = 55.16
DEFAULT_LNG = 61.4

class LocationWidget(forms.TextInput):
    def __init__(self, *args, **kw):

        self.map_width = kw.get("map_width", DEFAULT_WIDTH)
        self.map_height = kw.get("map_height", DEFAULT_HEIGHT)

        super(LocationWidget, self).__init__(*args, **kw)
        self.inner_widget = forms.widgets.HiddenInput()

    def render(self, name, value, *args, **kwargs):
        if value is None:
            lat, lng = DEFAULT_LAT, DEFAULT_LNG
        else:
            if isinstance(value, unicode):
                a, b = value.split(',')
            else:
                a, b = value
            lat, lng = float(a), float(b)

        js = '''
<script>
<!--
    var map_%(name)s;
    
    function savePosition_%(name)s(point)
    {
        var input = document.getElementById("id_%(name)s");
        input.value = point.lat().toFixed(6) + "," + point.lng().toFixed(6);
        map_%(name)s.panTo(point);
    }
    
    function load_%(name)s() {
        var point = new google.maps.LatLng(%(lat)f, %(lng)f);

        var options = {
            zoom: 13,
            center: point,
            mapTypeId: google.maps.MapTypeId.ROADMAP
            // mapTypeControl: true,
            // navigationControl: true
        };
        
        map_%(name)s = new google.maps.Map(document.getElementById("map_%(name)s"), options);

        var marker = new google.maps.Marker({
                map: map_%(name)s,
                position: new google.maps.LatLng(%(lat)f, %(lng)f),
                draggable: true
        
        });
        google.maps.event.addListener(marker, 'dragend', function(mouseEvent) {
            savePosition_%(name)s(mouseEvent.latLng);
        });

        google.maps.event.addListener(map_%(name)s, 'click', function(mouseEvent){
            marker.setPosition(mouseEvent.latLng);
            savePosition_%(name)s(mouseEvent.latLng);
        });

    }
    
    $(function() {
        load_%(name)s();
    });

//-->
</script>
        ''' % dict(name=name, lat=lat, lng=lng)
        html = self.inner_widget.render("%s" % name, "%f,%f" % (lat, lng), dict(id='id_%s' % name))
        html += '<div id="map_%s" style="width: %dpx; height: %dpx"></div>' % (name, self.map_width, self.map_height)

        return mark_safe(js + html)

    class Media:
        js = (
            'http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js',
            'http://maps.google.com/maps/api/js?sensor=false',
        )

So, this is probably the better way of using the original code found here.

In the example found here I skip using the custom model field.

In this example, I am using the custom model field.

Question: Can anyone get kwargs to pass map_width & map_height? I have had no luck myself; I have a feeling some of this code needs to be redone.

Note: I plan on posting my version of the widget in the next few days... I rewrote the JS to be more OOP, added a "geocode" field and did some house cleaning.

Cheers,
Micky