/* Copyright (c) 2006-2007 MetaCarta, Inc., published under the BSD license. * See http://svn.openlayers.org/trunk/openlayers/release-license.txt  * for the full text of the license. *//** * @requires OpenLayers/Layer/Markers.js * @requires OpenLayers/Ajax.js *  * Class: OpenLayers.Layer.GeoRSS * Add GeoRSS Point features to your map.  *  * Inherits from: *  - <OpenLayers.Layer.Markers> *  - <OpenLayers.Layer> */OpenLayers.Layer.GeoRSS = OpenLayers.Class(OpenLayers.Layer.Markers, {    /**      * Property: location      * {String} store url of text file      */    location: null,    /**      * Property: features      * Array({<OpenLayers.Feature>})      */    features: null,    /**      * Property: selectedFeature      * {<OpenLayers.Feature>}      */    selectedFeature: null,    /**      * APIProperty: icon      * {<OpenLayers.Icon>}. This determines the Icon to be used on the map     * for this GeoRSS layer.     */    icon: null,    /**     * APIProperty: popupSize     * {<OpenLayers.Size>} This determines the size of GeoRSS popups. If      * not provided, defaults to 250px by 120px.      */    popupSize: null,         /**      * APIProperty: useFeedTitle      * {Boolean} Set layer.name to the first <title> element in the feed. Default is true.      */    useFeedTitle: true,        /**    * Constructor: OpenLayers.Layer.GeoRSS    * Create a GeoRSS Layer.    *    * Parameters:    * name - {String}     * location - {String}     * options - {Object}    */    initialize: function(name, location, options) {        OpenLayers.Layer.Markers.prototype.initialize.apply(this, [name, options]);        this.location = location;        this.features = [];        this.events.triggerEvent("loadstart");        OpenLayers.loadURL(location, null, this, this.parseData);    },    /**     * Method: destroy      */    destroy: function() {        this.clearFeatures();        this.features = null;        OpenLayers.Layer.Markers.prototype.destroy.apply(this, arguments);    },            /**     * Method: parseData     * Parse the data returned from the Events call.     *     * Parameters:     * ajaxRequest - {XMLHttpRequest}      */    parseData: function(ajaxRequest) {        var doc = ajaxRequest.responseXML;        if (!doc || ajaxRequest.fileType!="XML") {            doc = OpenLayers.parseXMLString(ajaxRequest.responseText);        }                if (this.useFeedTitle) {            var name = null;            try {                name = doc.getElementsByTagNameNS('*', 'title')[0].firstChild.nodeValue;            }            catch (e) {                name = doc.getElementsByTagName('title')[0].firstChild.nodeValue;            }            if (name) {                this.setName(name);            }            }               /* Try RSS items first, then Atom entries */        var itemlist = null;        try {            itemlist = doc.getElementsByTagNameNS('*', 'item');        }        catch (e) {            itemlist = doc.getElementsByTagName('item');        }        if (itemlist.length == 0) {            try {                itemlist = doc.getElementsByTagNameNS('*', 'entry');            }            catch(e) {                itemlist = doc.getElementsByTagName('entry');            }        }        for (var i = 0; i < itemlist.length; i++) {            var data = {};            var point = OpenLayers.Util.getNodes(itemlist[i], 'georss:point');            var lat = OpenLayers.Util.getNodes(itemlist[i], 'geo:lat');            var lon = OpenLayers.Util.getNodes(itemlist[i], 'geo:long');            if (point.length > 0) {                var location = point[0].firstChild.nodeValue.split(" ");                                if (location.length !=2) {                    var location = point[0].firstChild.nodeValue.split(",");                }            } else if (lat.length > 0 && lon.length > 0) {                var location = [parseFloat(lat[0].firstChild.nodeValue), parseFloat(lon[0].firstChild.nodeValue)];            } else {                continue;            }            location = new OpenLayers.LonLat(parseFloat(location[1]), parseFloat(location[0]));                        /* Provide defaults for title and description */            var title = "Untitled";            try {              title = OpenLayers.Util.getNodes(itemlist[i],                         "title")[0].firstChild.nodeValue;            }            catch (e) { title="Untitled"; }                       /* First try RSS descriptions, then Atom summaries */            var descr_nodes = null;            try {                descr_nodes = itemlist[i].getElementsByTagNameNS("*",                                                "description");            }            catch (e) {                descr_nodes = itemlist[i].getElementsByTagName("description");            }            if (descr_nodes.length == 0) {                try {                    descr_nodes = itemlist[i].getElementsByTagNameNS("*",                                                "summary");                }                catch (e) {                    descr_nodes = itemlist[i].getElementsByTagName("summary");                }            }            var description = "No description.";            try {              description = descr_nodes[0].firstChild.nodeValue;            }            catch (e) { description="No description."; }            /* If no link URL is found in the first child node, try the               href attribute */            try {              var link = OpenLayers.Util.getNodes(itemlist[i], "link")[0].firstChild.nodeValue;            }             catch (e) {              try {                var link = OpenLayers.Util.getNodes(itemlist[i], "link")[0].getAttribute("href");              }              catch (e) {}            }            data.icon = this.icon == null ?                                      OpenLayers.Marker.defaultIcon() :                                      this.icon.clone();                        data.popupSize = this.popupSize ? this.popupSize.clone() : new OpenLayers.Size(250, 120);            if ((title != null) && (description != null)) {                contentHTML = '<div class="olLayerGeoRSSClose">[x]</div>';                 contentHTML += '<div class="olLayerGeoRSSTitle">';                if (link) contentHTML += '<a class="link" href="'+link+'" target="_blank">';                contentHTML += title;                if (link) contentHTML += '</a>';                contentHTML += '</div>';                contentHTML += '<div style="" class="olLayerGeoRSSDescription">';                contentHTML += description;                contentHTML += '</div>';                data['popupContentHTML'] = contentHTML;                            }            var feature = new OpenLayers.Feature(this, location, data);            this.features.push(feature);            var marker = feature.createMarker();            marker.events.register('click', feature, this.markerClick);            this.addMarker(marker);        }        this.events.triggerEvent("loadend");    },        /**     * Method: markerClick     *     * Parameters:     * evt - {Event}      */    markerClick: function(evt) {        sameMarkerClicked = (this == this.layer.selectedFeature);        this.layer.selectedFeature = (!sameMarkerClicked) ? this : null;        for(var i=0; i < this.layer.map.popups.length; i++) {            this.layer.map.removePopup(this.layer.map.popups[i]);        }        if (!sameMarkerClicked) {            var popup = this.createPopup();            OpenLayers.Event.observe(popup.div, "click",                OpenLayers.Function.bind(function() {                     for(var i=0; i < this.layer.map.popups.length; i++) {                         this.layer.map.removePopup(this.layer.map.popups[i]);                     }                }, this)            );            this.layer.map.addPopup(popup);         }        OpenLayers.Event.stop(evt);    },    /**     * Method: clearFeatures     * Destroy all features in this layer.     */    clearFeatures: function() {        if (this.features != null) {            while(this.features.length > 0) {                var feature = this.features[0];                OpenLayers.Util.removeItem(this.features, feature);                feature.destroy();            }        }            },        /** @final @type String */    CLASS_NAME: "OpenLayers.Layer.GeoRSS"});