原文链接及内容
这个例子展示了如何添加一个永远不会从地图中消失的Attribution控件。它的工作原理是将静态字符串或HTML字符串传递到属性选项中，而属性选项没有链接到图层。点击“切换图层”按钮显示，即使没有图层，静态属性仍然在屏幕上。
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
| import Map from 'ol/Map.js';
import OSM from 'ol/source/OSM.js';
import TileLayer from 'ol/layer/Tile.js';
import View from 'ol/View.js';
import {Attribution, defaults as defaultControls} from 'ol/control.js';
const attribution = new Attribution({
collapsible: false,
attributions: `<a href="https://openlayers.org">I'm a static attribution. I never disappear</a>`,
});
const map = new Map({
layers: [
new TileLayer({
source: new OSM(),
}),
],
controls: defaultControls({attribution: false}).extend([attribution]),
target: 'map',
view: new View({
center: [0, 0],
zoom: 2,
}),
});
document.getElementById('toggleLayerButton').addEventListener('click', () => {
map.getLayers().forEach((l) => {
l.setVisible(l.getVisible() ? false : true);
});
});
|
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
| <!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Static Attribution</title>
<link rel="stylesheet" href="node_modules/ol/ol.css">
<style>
.map {
width: 100%;
height: 400px;
}
</style>
</head>
<body>
<div id="map" class="map"></div>
<button id="toggleLayerButton">Toggle layer</button>
<script type="module" src="main.js"></script>
</body>
</html>
|
)
