这个超出屏幕能自动平移，没有试：
https://blog.csdn.net/qq_27186245/article/details/82227282
https://blog.csdn.net/qq_27186245/article/details/82227234
基于openlayer4实现多个popu展示
最近一个项目需要基于openlayer4实现类似于popu方式展现渔场具体信息。翻看官网有点击弹出demo,基于此逻辑编写动态生成overlay图层及其所需要的dom节点。
在编写改demo时，遇到一个特别问题：地图加载osm底图，坐标点使用的是随机三个坐标点，popu始终表现为一个，最终通过设置view的投影，效果正常。
源码
<!DOCTYPE html>
<html>
<head>
<title>Popup</title>
<link rel="stylesheet" href="https://openlayers.org/en/v4.6.5/css/ol.css" type="text/css">
<!-- The line below is only needed for old environments like Internet Explorer and Android 4.x -->
<script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList,URL"></script>
<script src="https://openlayers.org/en/v4.6.5/build/ol.js"></script>
<style>
.ol-popup {
position: absolute;
background-color: white;
-webkit-filter: drop-shadow(0 1px 4px rgba(0,0,0,0.2));
filter: drop-shadow(0 1px 4px rgba(0,0,0,0.2));
padding: 15px;
border-radius: 10px;
border: 1px solid #cccccc;
bottom: 12px;
left: -50px;
min-width: 50px;
}
.ol-popup:after, .ol-popup:before {
top: 100%;
border: solid transparent;
content: " ";
height: 0;
width: 0;
position: absolute;
pointer-events: none;
}
.ol-popup:after {
border-top-color: white;
border-width: 10px;
left: 48px;
margin-left: -10px;
}
.ol-popup:before {
border-top-color: #cccccc;
border-width: 11px;
left: 48px;
margin-left: -11px;
}
.ol-popup-closer {
text-decoration: none;
position: absolute;
top: 2px;
right: 8px;
}
.ol-popup-closer:after {
content: "✖";
}
</style>
</head>
<body>
<div id="map" class="map"></div>
<script>
var map = new ol.Map({
layers: [
new ol.layer.Tile({
source: new ol.source.OSM()
})
],
target: 'map',
view: new ol.View({
projection:"EPSG:4326",
center: [115.55145, 23.01361],
zoom: 9
})
});
//popu弹出层
var points=[[115.55145, 23.01361],[115.55145, 24.01361],[116.55145, 23.01361]];
points.forEach(function(v,i){
var tmp=document.createElement('div');
tmp.id="popup_"+i;
tmp.className='ol-popup';
tmp.innerHTML='<div>hi hi</div>';
var overlay_tmp= new ol.Overlay({
element: tmp,
autoPan: true,
autoPanAnimation: {
duration: 250
},
type:"mulPopu",
position:v
});
map.addOverlay(overlay_tmp);
});
map.on('singleclick', function(evt) {
});
</script>
</body>
</html>
