source: extensions/rv_gmaps/trunk/template/page_linker.js @ 31915

function PageLinker(map, aElementId)
{
        this._map = map;
        this._elementId = aElementId;

        google.maps.event.bind( this._map, "idle", this, this._regenerateUrl );
        google.maps.event.bind( this._map, "maptypeid_changed", this, this._regenerateUrl );
}

PageLinker.getQueryVars = function()
{
        var vars = {};
        var qString = unescape( top.location.search.substring(1) );
        if (qString.length==0)
                return vars;
        var pairs = qString.split(/\&/);
        for (var i=0; i<pairs.length; i++ )
        {
                var nameVal = pairs[i].split(/\=/);
                vars[nameVal[0]] = nameVal[1];
        }
        return vars;
};

PageLinker.map2Url = function( map )
{
        var vars = PageLinker.getQueryVars();
        vars['ll'] = map.getCenter().toUrlValue(5);
        vars['z'] = map.getZoom();
        vars['t']=map.getMapTypeId();

        var url = document.location.protocol+'//'+document.location.hostname+document.location.pathname;
        var bFirst = true;
        for (var key in vars)
        {
                url += bFirst ? "?" : "&";
                bFirst = false;
                url += key;
                if (vars[key]!=null)
                        url += "="+vars[key];
        }
        return url;
};

PageLinker.url2Map = function( mapOptions )
{
        var vars = PageLinker.getQueryVars();
        if ( !( (vars['z'] && vars['ll']) || vars['t'] ) )
                return false;

        var mapType = google.maps.MapTypeId.ROADMAP;
        if  (vars['t'])
                mapOptions.mapTypeId = vars['t'];
        
        if (vars['z'] && vars['ll'])
        {
                mapOptions.zoom = parseFloat(vars['z']);
                var ll = vars['ll'].split( "," );
                if (ll.length==2)
                {
                        mapOptions.center = new google.maps.LatLng( ll[0], ll[1] );
                }
                return true;
        }
        return false;
}


PageLinker.prototype = {

_regenerateUrl: function()
{
  var elt = document.getElementById( this._elementId );
  if (!elt) return;
  elt.href = PageLinker.map2Url(this._map);
}

}