GeoRSS.js
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/* Copyright (c) 2006 MetaCarta, Inc., published under the BSD license.
* See http://svn.openlayers.org/trunk/openlayers/release-license.txt
* for the full text of the license. */
/**
* @class
*
* @requires OpenLayers/Layer/Markers.js
* @requires OpenLayers/Ajax.js
*/
OpenLayers.Layer.GeoRSS = OpenLayers.Class.create();
OpenLayers.Layer.GeoRSS.prototype =
OpenLayers.Class.inherit( OpenLayers.Layer.Markers, {
/** store url of text file
* @type str */
location:null,
/** @type Array(OpenLayers.Feature) */
features: null,
/** @type OpenLayers.Feature */
selectedFeature: null,
/**
* @constructor
*
* @param {String} name
* @param {String} location
*/
initialize: function(name, location) {
OpenLayers.Layer.Markers.prototype.initialize.apply(this, [name]);
this.location = location;
this.features = new Array();
OpenLayers.loadURL(location, null, this, this.parseData);
},
/**
*
*/
destroy: function() {
this.clearFeatures();
this.features = null;
OpenLayers.Layer.Markers.prototype.destroy.apply(this, arguments);
},
/**
* @param {XMLHttpRequest} ajaxRequest
*/
parseData: function(ajaxRequest) {
var doc = ajaxRequest.responseXML;
if (!doc || ajaxRequest.fileType!="XML") {
doc = OpenLayers.parseXMLString(ajaxRequest.responseText);
}
this.name = null;
try {
this.name = doc.getElementsByTagNameNS('*', 'title')[0].firstChild.nodeValue;
}
catch (e) {
this.name = doc.getElementsByTagName('title')[0].firstChild.nodeValue;
}
/* 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 = OpenLayers.Marker.defaultIcon();
data.popupSize = 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);
}
},
/**
* @param {Event} evt
*/
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",
function() {
for(var i=0; i < this.layer.map.popups.length; i++) {
this.layer.map.removePopup(this.layer.map.popups[i]);
}
}.bindAsEventListener(this));
this.layer.map.addPopup(popup);
}
OpenLayers.Event.stop(evt);
},
/**
*
*/
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"
});