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    Sealyu

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    We’re building a Django application at work, and I had to implement a way for a user to select a location on a map, in order to be able to save the exact coordinates and the zoom level the user chose.
    I looked around to see if something similar had been developed, but I did not find anything so simple and useful as what I later developed, so for the sake of open source-ness I’m sharing it here with you.
    It is implemented as a standard Django form widget so just do as any other Django widget, for example:

    class PersonForm(forms.Form):
    name = forms.CharField()
    website = forms.URLField()
    location = forms.CharField(widget=GMapInput(attrs={'width':'600', 'height':'400'}))

    Here’s the code for the GMapInput class (sorry for the docs in Spanish, but I’m in Mexico):

    from django.forms.widgets import Input
    from django.utils.safestring import mark_safe
     
    class GMapInput(Input):
    """
    Widget para seleccionar un punto en un mapa de Google
    """

     
    def render(self, name, value, attrs=None):
    """
    Atributos extras:
    - width: ancho del mapa en pixeles
    - height: alto del mapa en pixeles
    - center: latitud,longitud del punto central del mapa
    - zoom: zoom inicial del mapa, 1 - 17
    """

     
    final_attrs = self.build_attrs(attrs)
    width = final_attrs['width'] if 'width' in final_attrs else '500'
    height = final_attrs['height'] if 'height' in final_attrs else '300'
    center = final_attrs['center'] if 'center' in final_attrs else '21.983801,-100.964355' # Centro de México
    zoom = final_attrs['zoom'] if 'zoom' in final_attrs else '4' # Zoom amplio, se ve todo un país
     
    widget = u'''<div style="margin-left:7em; padding-left:30px;">
    <input type="hidden" value="%(value)s" name="%(name)s" id="%(id)s" />
    <div id="%(id)s_map" style="width: %(width)spx; height: %(height)spx"></div></div>
    <script type="text/javascript">
    var %(id)s_map = new GMap2(document.getElementById("%(id)s_map"));
    %(id)s_map.addControl(new GLargeMapControl3D());
     
    var %(id)s_marker;
    function %(id)s_updateField() {
    document.getElementById("%(id)s").value = %(id)s_marker.getLatLng().toUrlValue() + "|" + %(id)s_map.getZoom();
    %(id)s_map.panTo(%(id)s_marker.getLatLng(), true);
    }
    '
    '' % { 'value': value, 'name': name, 'id': final_attrs['id'], 'width': width, 'height': height }
     
    if value is None or value == '':
    widget = widget + u'''
    %(id)s_map.setCenter(new GLatLng(%(center)s), %(zoom)s);
    var %(id)s_clickListener = GEvent.addListener(%(id)s_map, "click", function(overlay, latlng) {
    if(latlng) {
    %(id)s_marker = new GMarker(latlng, {draggable: true});
    %(id)s_map.addOverlay(%(id)s_marker);
    %(id)s_updateField();
     
    GEvent.addListener(%(id)s_marker, "dragend", %(id)s_updateField);
    GEvent.addListener(%(id)s_map, "zoomend", %(id)s_updateField);
    GEvent.addListener(%(id)s_map, "dblclick", function (overlay, latlng) { %(id)s_marker.setLatLng(latlng); %(id)s_updateField(); });
    GEvent.removeListener(%(id)s_clickListener);
    }
    });
    </script>'
    '' % { 'id': final_attrs['id'], 'center': center, 'zoom': zoom }
    else:
    values = value.partition('|')
     
    widget = widget + u'''
    %(id)s_map.setCenter(new GLatLng(%(coords)s), %(zoom)s);
    %(id)s_marker = new GMarker(new GLatLng(%(coords)s), {draggable: true});
    %(id)s_map.addOverlay(%(id)s_marker);
     
    GEvent.addListener(%(id)s_marker, "dragend", %(id)s_updateField);
    GEvent.addListener(%(id)s_map, "zoomend", %(id)s_updateField);
    GEvent.addListener(%(id)s_map, "dblclick", function (overlay, latlng) { %(id)s_marker.setLatLng(latlng); %(id)s_updateField(); });
    '
    '' % { 'id': final_attrs['id'], 'coords': values[0], 'zoom': values[2] }
     
    return mark_safe(widget)

    Don’t forget to add the <script> tag linking to the Google Maps API.

    It is yet far from perfect, but I still hope it helps someone out there.

    posted on 2010-05-11 03:42 seal 閱讀(471) 評論(0)  編輯  收藏 所屬分類: Python
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