我正在使用Vuelayers
库开发Web地图应用程序,该库是具有OpenLayers功能的 Web map Vue组件,
我的模板中包含以下代码:
<vl-map @singleclick="hideOverlay" @postcompose="onMapPostCompose"
:load-tiles-while-animating="true" ref="map"
:load-tiles-while-interacting="true" data-projection="EPSG:4326"
style="height: 900px" @mounted="onMapMounted">
....
<component v-for="layer in layers" :ref="layer.id" overlay
:is="layer.cmp"
:key="layer.id" v-bind="layer">
<component :is="layer.source.cmp" v-if="layer.visible" v-bind="layer.source">
</component>
</component>
....
</vl-map>
并且在数据对象中,我具有以下属性:
layers: [
{
id: 'sections',
title: 'Sections',
cmp: 'vl-layer-tile',
visible: true,
source: {
cmp: 'vl-source-wms',
url: 'http://localhost:8080/geoserver/sager/wms',
layers: 'sections',
tiled: true,
format: 'image/png',
serverType: 'geoserver',
},
},
....
]
所以我想在单击图层时获取图层属性吗?知道vl-tile-layer
没有here
@click
事件
答案 0 :(得分:3)
只需将点击处理程序放置在顶级地图组件上,如下所示:
<vl-map @click="mapClick" @singleclick="hideOverlay" @postcompose="onMapPostCompose"
:load-tiles-while-animating="true" ref="map"
:load-tiles-while-interacting="true" data-projection="EPSG:4326"
style="height: 900px" @mounted="onMapMounted">
</vl-map>
然后在click事件中使用forEachLayerAtPixel函数,该函数对在该屏幕像素处显示的每一层进行操作,并为您提供ol.Layer.Layer对象,您可以在以下对象上调用getProperties()
methods: {
mapClick: function(evt){
evt.map.forEachLayerAtPixel(
evt.pixel,
function(layer){ layer.getProperties()},
function(layer){/*filter layers you want to get property data on*/})
}
}
仅当服务器上设置了CORS并且可以在vue层在后台使用的OpenLayers层上设置crossOrigin设置时,以上内容才起作用。上面的方法更好,但是如果出现错误提示
"SecurityError: Failed to execute 'getImageData' on
'CanvasRenderingContext2D': The canvas has been tainted by cross-origin data
然后您可以使用更通用的功能,例如
evt.map.getLayers().item(0)
or
evt.map.getLayers.forEach(
function(layer){
layerProps = layer.getProperties()
if(layerProps.id === "the one you want")
{
// You will have to implement your own intersection logic here
// to see if the click point intersected with the layer.
}
})