原文链接及内容
你可以监听地图的loadstart和loadend事件，在地图的顶部显示一个加载旋转器(加载动效)。
main.js代码如下：
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
| import Map from 'ol/Map.js';
import TileLayer from 'ol/layer/Tile.js';
import View from 'ol/View.js';
import XYZ from 'ol/source/XYZ.js';
const key = 'get_your_own_D6rA4zTHduk6KOKTXzGB';
const attributions =
'<a href="https://www.maptiler.com/copyright/" target="_blank">© MapTiler</a> ' +
'<a href="https://www.openstreetmap.org/copyright" target="_blank">© OpenStreetMap contributors</a>';
const source = new XYZ({
attributions: attributions,
url: 'https://api.maptiler.com/maps/streets/{z}/{x}/{y}.png?key=' + key,
tileSize: 512,
});
const map = new Map({
layers: [new TileLayer({source: source})],
target: 'map',
view: new View({
center: [0, 0],
zoom: 2,
}),
});
map.on('loadstart', function () {
map.getTargetElement().classList.add('spinner');
});
map.on('loadend', function () {
map.getTargetElement().classList.remove('spinner');
});
|
界面布局文件index.html代码如下：
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
| <!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Loading Spinner</title>
<link rel="stylesheet" href="node_modules/ol/ol.css">
<style>
.map {
width: 100%;
height: 400px;
}
.map {
background: #85ccf9;
position: relative;
}
#map {
height: 400px;
position: relative;
}
@keyframes spinner {
to {
transform: rotate(360deg);
}
}
.spinner:after {
content: "";
box-sizing: border-box;
position: absolute;
top: 50%;
left: 50%;
width: 40px;
height: 40px;
margin-top: -20px;
margin-left: -20px;
border-radius: 50%;
border: 5px solid rgba(180, 180, 180, 0.6);
border-top-color: rgba(0, 0, 0, 0.6);
animation: spinner 0.6s linear infinite;
}
</style>
</head>
<body>
<div id="map" class="map"></div>
<script src="https://cdn.jsdelivr.net/npm/elm-pep@1.0.6/dist/elm-pep.js"></script>
<script type="module" src="main.js"></script>
</body>
</html>
|
)
