获取某类覆盖物

当地图上出现多种覆盖物类型的时候，获取某类覆盖物的方式。

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          <!doctype html>
<html>
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no, width=device-width">
    <title>获取某类覆盖物</title>
    <link rel="stylesheet" href="https://a.amap.com/jsapi_demos/static/demo-center/css/demo-center.css"/>
    <style>
        html, body, #container {
            height: 100%;
            width: 100%;
        }

        .input-card{
            width: 26rem;
        }

        .input-card .btn{
            margin-right: .9rem;
        }

        .input-card .btn:last-child{
            margin-right: 0;
        }
    </style>
</head>
<body>
<div id="container"></div>
<div class="input-card">
    <h4>获取某类覆盖物</h4>
    <div class="input-item">
        <input id="getPointOverlays" type="button" class="btn" value="获取点覆盖物"/>
        <input id="getPolylineOverlays" type="button" class="btn" value="获取线覆盖物"/>
        <input id="getPolygonOverlays" type="button" class="btn" value="获取面覆盖物"/>
    </div>
</div>
<script type="text/javascript"
        src="https://webapi.amap.com/maps?v=1.4.15&key=您申请的key值"></script>
<script type="text/javascript">
    // 创建地图实例
    var map = new AMap.Map("container", {
        zoom: 13,
        center: [116.43, 39.92],
        resizeEnable: true
    });

    // 创建点、线、面覆盖物实例
    var marker = new AMap.Marker({
        position: new AMap.LngLat(116.39, 39.92),
    });

    var polylinePath = [
        new AMap.LngLat(116.41, 39.93),
        new AMap.LngLat(116.43, 39.91)
    ];

    var polyline = new AMap.Polyline({
        path: polylinePath
    });

    var polygonPath = [
        new AMap.LngLat(116.46, 39.93),
        new AMap.LngLat(116.44, 39.91),
        new AMap.LngLat(116.49, 39.91)
    ];

    var polygon = new AMap.Polygon({
        path: polygonPath
    });

    // 将点，线，面添加到地图
    map.add([marker, polyline, polygon]);

    var info = {
      'marker': '点标记',
      'polyline': '线',
      'polygon': '面',
    };

    function getAllOverlays(type) {
        // 获取当 marker 类型的覆盖物
        var overlays = map.getAllOverlays(type);

        var position = type == 'marker'? overlays[0].getPosition(): overlays[0].getPath()[0];

        var infoWindow = new AMap.InfoWindow({
            position: position,
            offset: type == 'marker'? new AMap.Pixel(0, -35): new AMap.Pixel(0, -5),
            content: '<div>已获取' + info[type] + '覆盖物</div>'
        });

        infoWindow.open(map);
    }

    // 绑定获取覆盖物事件
    document.getElementById("getPointOverlays").onclick = getAllOverlays.bind(null, 'marker');
    document.getElementById("getPolylineOverlays").onclick = getAllOverlays.bind(null, 'polyline');
    document.getElementById("getPolygonOverlays").onclick = getAllOverlays.bind(null, 'polygon');
</script>
</body>
</html>
        

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