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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 Paging Strategy 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, photos, paging;
+
+ /**
+ * A specific format for parsing Flickr API JSON responses.
+ */
+ OpenLayers.Format.Flickr = OpenLayers.Class(OpenLayers.Format, {
+ read: function(obj) {
+ if(obj.stat === 'fail') {
+ throw new Error(
+ ['Flickr failure response (',
+ obj.code,
+ '): ',
+ obj.message].join(''));
+ }
+ if(!obj || !obj.photos ||
+ !OpenLayers.Util.isArray(obj.photos.photo)) {
+ throw new Error(
+ 'Unexpected Flickr response');
+ }
+ var photos = obj.photos.photo, photo,
+ x, y, point,
+ feature, features = [];
+ for(var i=0,l=photos.length; i<l; i++) {
+ photo = photos[i];
+ x = photo.longitude;
+ y = photo.latitude;
+ point = new OpenLayers.Geometry.Point(x, y);
+ feature = new OpenLayers.Feature.Vector(point, {
+ title: photo.title,
+ img_url: photo.url_s
+ });
+ features.push(feature);
+ }
+ return features;
+ }
+ });
+
+ function init() {
+ map = new OpenLayers.Map('map');
+ var base = new OpenLayers.Layer.OSM();
+
+ var style = new OpenLayers.Style({
+ externalGraphic: "${img_url}",
+ pointRadius: 30
+ });
+
+ paging = new OpenLayers.Strategy.Paging();
+
+ photos = new OpenLayers.Layer.Vector("Photos", {
+ projection: "EPSG:4326",
+ strategies: [new OpenLayers.Strategy.Fixed(), paging],
+ protocol: new OpenLayers.Protocol.Script({
+ url: "http://api.flickr.com/services/rest",
+ params: {
+ api_key: 'b5e8c0e287e678671c3d8b2c0f3ced85',
+ format: 'json',
+ method: 'flickr.photos.search',
+ extras: 'geo,url_s',
+ per_page: 100,
+ page: 1,
+ bbox: [-180, -90, 180, 90]
+ },
+ callbackKey: 'jsoncallback',
+ format: new OpenLayers.Format.Flickr()
+ }),
+ styleMap: new OpenLayers.StyleMap(style)
+ });
+
+ map.addLayers([base, photos]);
+ photos.events.on({"featuresadded": updateButtons});
+ map.setCenter(new OpenLayers.LonLat(0, 0), 1);
+ }
+
+ function updateButtons() {
+ document.getElementById("prev").disabled = (paging.pageNum() < 1);
+ document.getElementById("next").disabled = (paging.pageNum() >= paging.pageCount() - 1);
+ document.getElementById("num").innerHTML = paging.pageNum() + 1;
+ document.getElementById("count").innerHTML = paging.pageCount();
+ }
+ </script>
+ </head>
+ <body onload="init()">
+ <h1 id="title">Paging Strategy Example</h1>
+ <div id="tags">
+ vector, feature, stylemap, paging, strategy, flickr, script
+ </div>
+ <p id="shortdesc">
+ Uses a paging strategy to cache large batches of features and render a page at a time.
+ </p>
+ <div id="map" class="smallmap"></div>
+ Displaying page <span id="num">0</span> of <span id="count">...</span>
+ <button id="prev" disabled="disabled" onclick="paging.pagePrevious();">previous</button>
+ <button id="next" disabled="disabled" onclick="paging.pageNext();">next</button>
+ <br><br>
+ <div id="docs">
+ <p>The Paging strategy lets you apply client side paging for protocols
+ that do not support paging on the server. In this case, the protocol requests a
+ batch of 100 features, the strategy caches those and supplies a single
+ page at a time to the layer.</p>
+ <p>This particular example uses the <a
+ href="http://www.flickr.com/services/api/">Flickr API.</a></p>
+ </div>
+ </body>
+</html>