openlayer WMS GetFeatureInfo（圖層）
WMS GetFeatureInfo（圖層）
| 所有功能： | 6 |
| 酒店特色： | 2 |
| 餐廳特色： | 4 |
演示layers在ol/format/WMSGetFeatureInfoformat物件中使用該選項，該選項允許單個WMS GetFeatureInfo請求返回的功能要求按層名讀取多個圖層。
<!DOCTYPE html><html>
<head>
<title>WMS GetFeatureInfo (Layers)</title>
<link rel="stylesheet" href
="https://openlayers.org/en/v5.1.3/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></head>
<body>
<table id="info">
<tr>
<td>All features:</td>
<td id="all"></td>
</tr>
<tr>
<td>Hotel features:</td>
<td id="hotel"></td>
</
tr><tr>
<td>Restaurant features:</td>
<td id="restaurant"></td>
</tr>
</table>
<script>
import WMSGetFeatureInfo from 'ol/format/WMSGetFeatureInfo.js';
fetch('data/wmsgetfeatureinfo/osm-restaurant-hotel.xml').then(function(response) {
return response.text();
}).then(function(response) {
// this is the standard way to read the features
var allFeatures = new WMSGetFeatureInfo().readFeatures(response);
document.getElementById('all').innerText = allFeatures.length.toString();
// when specifying the 'layers' options, only the features of those
// layers are returned by the format
var hotelFeatures = new WMSGetFeatureInfo({
layers: ['hotel']
}).readFeatures(response);
document.getElementById('hotel').innerText = hotelFeatures.length.toString();
var restaurantFeatures = new WMSGetFeatureInfo({
layers: ['restaurant']
}).readFeatures(response);
document.getElementById('restaurant').innerText = restaurantFeatures.length.toString();
});
</script>
</body></html>