Popup

<!--
  示例：弹窗
  核心逻辑：点击地图在点击处打开 Popup，另有一个固定在北京的说明弹窗
  依赖：MapLibre GL JS 4 · jsDelivr CDN · demotiles 免 Key 样式
-->
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta name="robots" content="noindex,follow">
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>弹窗</title>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/maplibre-gl@4/dist/maplibre-gl.css">
<style>
  html,body{height:100%;margin:0}
  body{display:flex;flex-direction:column;overflow:hidden;
       font:13px/1.6 -apple-system,"Segoe UI","PingFang SC",sans-serif;color:#16181d}
  .bar{flex:0 0 auto;display:flex;gap:10px;align-items:center;padding:8px 12px;
       background:#f6f7f9;border-bottom:1px solid #e3e6ea;font-size:12px;color:#58606e;flex-wrap:wrap}
  .bar button{font:inherit;font-size:12px;padding:4px 10px;border-radius:4px;cursor:pointer;
       border:1px solid #ccd1d9;background:#fff;color:#16181d}
  .bar button:hover{background:#eef0f3}
  .bar b{color:#16181d;font-weight:600}
  .pop{font-size:12px;line-height:1.7}
  .pop b{display:block;margin-bottom:2px}
  #map{flex:1 1 auto;min-height:0}
</style>
</head>
<body>
<div class="bar">
  <button id="beijing">打开北京弹窗</button>
  <button id="close">关闭弹窗</button>
  <span>点击地图任意位置查看坐标</span>
</div>
<div id="map"></div>
<script src="https://cdn.jsdelivr.net/npm/maplibre-gl@4/dist/maplibre-gl.js"></script>
<script>
(function () {
  'use strict';

  if (typeof maplibregl === 'undefined') {
    document.body.innerHTML =
      '<div style="padding:24px;color:#b42318">MapLibre 加载失败，请检查能否访问 cdn.jsdelivr.net</div>';
    return;
  }

  var map = new maplibregl.Map({
    container: 'map',
    style: 'https://demotiles.maplibre.org/style.json',
    center: [110, 34],
    zoom: 3,
    attributionControl: {
      compact: true,
      customAttribution: 'MapLibre demo tiles'
    }
  });

  var popup = new maplibregl.Popup({
    closeButton: true,
    closeOnClick: false,
    offset: 14,
    maxWidth: '260px',
    className: 'pop'
  });

  map.on('click', function (e) {
    var c = e.lngLat;
    popup
      .setLngLat(c)
      .setHTML(
        '<b>点击位置</b><br>' +
        '经度 ' + c.lng.toFixed(5) + '<br>' +
        '纬度 ' + c.lat.toFixed(5) + '<br>' +
        '缩放 ' + map.getZoom().toFixed(2)
      )
      .addTo(map);
  });

  document.getElementById('beijing').addEventListener('click', function () {
    popup
      .setLngLat([116.391263, 39.907359])
      .setHTML('<b>北京</b>MapLibre demo 样式只提供国界数据，<br>城市级别的细节需要完整底图。')
      .addTo(map);

    map.easeTo({ center: [116.391263, 39.907359], zoom: 4, duration: 800 });
  });

  document.getElementById('close').addEventListener('click', function () {
    popup.remove();
  });

  map.addControl(new maplibregl.NavigationControl(), 'top-right');
})();
</script>
</body>
</html>