WMS Capabilities

<!--
  示例：OpenLayers WMS 能力文档
  要点：ol.format.WMSCapabilities 解析 GetCapabilities XML，输出服务、图层与请求能力
  依赖：OpenLayers 10.3.1 · jsDelivr CDN
-->
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<title>WMS 能力文档</title>
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<div class="bar">
  <span>WMS 1.3.0 能力文档</span>
  <span class="sep"></span>
  <span id="info">解析中…</span>
</div>
<pre id="log" class="log"></pre>
<script src="https://cdn.jsdelivr.net/npm/ol@10.3.1/dist/ol.js"></script>
<script>
(function () {
  'use strict';

  if (typeof ol === 'undefined') {
    document.getElementById('log').textContent = 'OpenLayers 加载失败，请检查能否访问 cdn.jsdelivr.net';
    return;
  }


  var xml = '<WMS_Capabilities version="1.3.0" ' +
    'xmlns="http://www.opengis.net/wms" ' +
    'xmlns:xlink="http://www.w3.org/1999/xlink">' +
    '<Service><Name>WMS</Name><Title>演示 WMS 服务</Title>' +
    '<Abstract>页面内构造的能力文档</Abstract>' +
    '<OnlineResource xlink:type="simple" xlink:href="https://demo.invalid/wms"/></Service>' +
    '<Capability>' +
    '<Request>' +
    '<GetCapabilities><Format>text/xml</Format></GetCapabilities>' +
    '<GetMap><Format>image/png</Format><Format>image/jpeg</Format>' +
    '<DCPType><HTTP><Get><OnlineResource xlink:type="simple" ' +
    'xlink:href="https://demo.invalid/wms"/></Get></HTTP></DCPType></GetMap>' +
    '<GetFeatureInfo><Format>text/plain</Format></GetFeatureInfo>' +
    '</Request>' +
    '<Exception><Format>XML</Format></Exception>' +
    '<Layer><Title>演示根图层</Title><CRS>EPSG:3857</CRS>' +
    '<EX_GeographicBoundingBox>115.8 39.5 117.0 40.3</EX_GeographicBoundingBox>' +
    '<Layer queryable="1"><Name>demo:districts</Name><Title>演示区县</Title>' +
    '<CRS>EPSG:3857</CRS><Style><Name>default</Name><Title>默认样式</Title></Style>' +
    '</Layer>' +
    '<Layer queryable="1"><Name>demo:water</Name><Title>演示水域</Title>' +
    '<CRS>EPSG:3857</CRS><Style><Name>default</Name><Title>默认样式</Title></Style>' +
    '</Layer>' +
    '</Layer>' +
    '</Capability>' +
    '</WMS_Capabilities>';

  var result = new ol.format.WMSCapabilities().read(xml);

  document.getElementById('log').textContent = JSON.stringify(result, null, 2);

  var layers = 0;
  function countLayers(node) {
    if (!node) {
      return;
    }
    if (node.Name) {
      ++layers;
    }
    (node.Layer || []).forEach(countLayers);
  }
  countLayers(result.Capability && result.Capability.Layer);

  document.getElementById('info').textContent =
    '版本 ' + result.version + ' · ' + (result.Service && result.Service.Title) +
    ' · 具名图层 ' + layers + ' 个';

})();
</script>
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