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-<!DOCTYPE html>
-<html>
- <head>
- <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
- <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
- <meta name="apple-mobile-web-app-capable" content="yes">
- <title>OpenLayers Vector Behavior Example</title>
- <link rel="stylesheet" href="../theme/default/style.css" type="text/css">
- <link rel="stylesheet" href="style.css" type="text/css">
- <script src="../lib/OpenLayers.js"></script>
- <script type="text/javascript">
- var map;
-
- function init(){
- map = new OpenLayers.Map('map');
- var wms = new OpenLayers.Layer.WMS(
- "OpenLayers WMS", "http://vmap0.tiles.osgeo.org/wms/vmap0",
- {layers: 'basic'}
- );
-
- var layer = new OpenLayers.Layer.Vector("POIs", {
- strategies: [new OpenLayers.Strategy.BBOX({resFactor: 1.1})],
- protocol: new OpenLayers.Protocol.HTTP({
- url: "textfile.txt",
- format: new OpenLayers.Format.Text()
- })
- });
-
- map.addLayers([wms, layer]);
- map.zoomToMaxExtent();
-
- // Interaction; not needed for initial display.
- selectControl = new OpenLayers.Control.SelectFeature(layer);
- map.addControl(selectControl);
- selectControl.activate();
- layer.events.on({
- 'featureselected': onFeatureSelect,
- 'featureunselected': onFeatureUnselect
- });
- }
-
-
- // Needed only for interaction, not for the display.
- function onPopupClose(evt) {
- // 'this' is the popup.
- var feature = this.feature;
- if (feature.layer) { // The feature is not destroyed
- selectControl.unselect(feature);
- } else { // After "moveend" or "refresh" events on POIs layer all
- // features have been destroyed by the Strategy.BBOX
- this.destroy();
- }
- }
- function onFeatureSelect(evt) {
- feature = evt.feature;
- popup = new OpenLayers.Popup.FramedCloud("featurePopup",
- feature.geometry.getBounds().getCenterLonLat(),
- new OpenLayers.Size(100,100),
- "<h2>"+feature.attributes.title + "</h2>" +
- feature.attributes.description,
- null, true, onPopupClose);
- feature.popup = popup;
- popup.feature = feature;
- map.addPopup(popup, true);
- }
- function onFeatureUnselect(evt) {
- feature = evt.feature;
- if (feature.popup) {
- popup.feature = null;
- map.removePopup(feature.popup);
- feature.popup.destroy();
- feature.popup = null;
- }
- }
- </script>
- </head>
- <body onload="init()">
- <h1 id="title">Dynamic POIs via a Text Layer</h1>
- <div id="tags">
- poi, dynamic data, text, format, strategy, popup, select, selection
- </div>
- <p id="shortdesc">
- Loading dynamic data from a text file.
- </p>
- <div id="map" class="smallmap"></div>
- <div id="docs">
- <p>The vector layer shown uses the BBOX strategy, the HTTP protocol,
- and the Text format.
- This setup appends "?bbox=west,south,east,north" to every
- request. This allows you to configure the location as something
- like 'textfile.php', and take the '?bbox=' parameter to select
- data from a database or the like.</p>
- <p>There is nothing about this example that limits it to text files;
- you can do the same thing with KML, GeoJSON, etc.</p>
- <p>This is an alternative to something like the <a href="http://wiki.openstreetmap.org/index.php/OpenLayers_Dynamic_POI">OpenStreetMap "Dynamic POI"</a> example. The Layer is a standard vector layer, and interaction can be
- configured via the SelectFeature control, as you can see in the
- latter half of the code, which allows you to open a popup when
- a feature is selected.</p>
- </div>
- </body>
-</html>