[英]OpenLayers 3 - Several WMS layers, how to get Feature Info only from visible ones?
I have an Openlayers map with several WMS layers from which I want to request feature information through "getGetFeatureInfoUrl". 我有一个Openlayers地图,其中包含几个WMS图层,我想通过这些地图通过“ getGetFeatureInfoUrl”请求要素信息。 Visibility of layers can be turned on/off in the layer tree. 可以在层树中打开/关闭层的可见性。 I'd like to, upon clicking somewhere in the map: 我想点击地图上的某个位置:
I used the sample code from the OpenLayers website. 我使用了OpenLayers网站上的示例代码。 I tried variants of this code bit 我尝试了此代码位的变体
var url = layers[2].getSource().getGetFeatureInfoUrl(
evt1.coordinate, viewResolution, 'EPSG:3857', {
'INFO_FORMAT': 'text/html',
'FEATURE_COUNT': '300'
});
like 喜欢
var url = layers[].getSource().getGetFeatureInfoUrl(
or var url = layers[1,2].getSource().getGetFeatureInfoUrl(
, but either no Feature Info is delivered, or merely for the last layer - regardless of whether it is visible or not. var url = layers[].getSource().getGetFeatureInfoUrl(
或var url = layers[1,2].getSource().getGetFeatureInfoUrl(
,但要么不传递任何要素信息,要么仅传递最后一层-无论是否传递是否可见。
I created a JSFiddle with two sample layers here: http://jsfiddle.net/kidalex/j34xzaa3/5/ 我在这里创建了带有两个示例层的JSFiddle: http : //jsfiddle.net/kidalex/j34xzaa3/5/
Similar questions were asked before, like here: https://gis.stackexchange.com/questions/114297/querying-multiple-wms-layers-in-ol3-and-adding-to-a-single-popup-window ; 之前曾问过类似的问题,例如: https : //gis.stackexchange.com/questions/114297/querying-multiple-wms-layers-in-ol3-and-adding-to-a-single-popup-window ; but I cannot fathom how to apply the solutions (JS/OL newbie here). 但我无法理解如何应用解决方案(此处为JS / OL新手)。
You should iterate over your layers and only call getFeatureInfo if they are visible and not the base layer, try something like: 您应该遍历各层,并且仅在可见时调用getFeatureInfo,而不是基础层,请尝试以下操作:
map.on('singleclick', function (evt1) {
document.getElementById('info').innerHTML = '';
var viewResolution = /** @type {number} */
(view.getResolution());
var url = '';
document.getElementById('info').innerHTML ='';
layers.forEach(function (layer, i, layers) {
if (layer.getVisible() && layer.get('name')!='Basemap') {
url = layer.getSource().getGetFeatureInfoUrl(evt1.coordinate, viewResolution, 'EPSG:3857', {
'INFO_FORMAT': 'text/html',
'FEATURE_COUNT': '300'
});
if (url) {
document.getElementById('info').innerHTML +=
'<iframe seamless src="' + url + '"></iframe>';
}
}
});
});
EDIT: grammar 编辑:语法
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