1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
|
<!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">
<link rel="stylesheet" href="../../theme/default/style.css" type="text/css">
<link rel="stylesheet" href="../../examples/style.css" type="text/css">
<script src="../../lib/OpenLayers.js"></script>
<script type="text/javascript">
var lon = 5;
var lat = 40;
var zoom = 5;
var map, layer;
var numLoadingLayers = 0;
function init(){
map = new OpenLayers.Map( 'map' );
layer = new OpenLayers.Layer.WMS( "OpenLayers WMS",
"http://vmap0.tiles.osgeo.org/wms/vmap0", {layers: 'basic'});
layer.events.register('loadstart', this, onloadstart);
layer.events.register('loadend', this, onloadend);
map.addLayer(layer);
map.setCenter(new OpenLayers.LonLat(lon, lat), zoom);
}
function log(msg) {
document.getElementById("output").innerHTML += msg + "<br />";
}
function onloadstart(evt) {
numLoadingLayers++;
var msg = ['loadstart', '# layers loading:', numLoadingLayers].join(' ');
log (msg);
};
function onloadend(evt) {
numLoadingLayers--;
var msg = ['loadend ', '# layers loading:', numLoadingLayers].join(' ');
log (msg);
};
</script>
</head>
<body onload="init()">
<h1 id="title">WMS loadstart/loadend events</h1>
<div id="tags">
wms, layer, singletile
</div>
<p id="shortdesc">
Shows the loadstart and loadend events of a WMS layer
</p>
<div id="map" class="smallmap"></div>
<div id="docs">
<p>
This example is helpful in testing whether all loadstart events are followed
by a loadend event.
Test by using scroll-wheel up and down.
</p>
</div>
<h1>loadstart and loadend events</h1>
<pre id="output"></pre>
</body>
</html>
|
