微信小程序中使用地图(map)组件，通过点击(tap)获取经纬度，按照官方的，暂时是没法做到的，从地图组件api多有残缺判断，怀疑是个实习生干的...
做个变通，适用性有限，请大家参考。基本思路就是在地图上铺满一层marker，从而通过点击marker获得经纬度。
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const app = getapp()
const markersize = 30
function range(start, edge, step) {
for (var ret = [];
(edge - start) * step > 0; start += step) {
ret.push(start);
}
return ret;
}
function markers(northeast, southwest, scale, width, height) {
const markerslng = (northeast.longitude - southwest.longitude) * markersize / width
const markerslat = (northeast.latitude - southwest.latitude) * markersize / height
const maxlon = northeast.longitude
const minlon = southwest.longitude
const maxlat = northeast.latitude
const minlat = southwest.latitude
const lons = range(minlon, maxlon, markerslng)
const lats = range(minlat, maxlat, markerslat)
let _markers = []
lons.foreach((lon, i) => {
lats.foreach((lat, j) => {
_markers.push({
id: lon + ',' + lat,
latitude: lat,
longitude: lon,
iconpath: '/marker.png',
alpha: 0.1, //将图片设置为透明,通过开发者工具看不出效果,但真机是有效果的
width: markersize,
height: markersize
})
})
})
return _markers
}
page({
data: {
polygons: [],
controls: [{
id: 1,
position: {
left: 0,
top: 300 - 50,
width: 50,
height: 50
},
clickable: true
}],
markers: []
},
createmarkers() {
this.mapctx = wx.createmapcontext('map')
const query = wx.createselectorquery()
const map = query.select('#map').boundingclientrect()
let that = this
that.mapctx.getregion({
success(res1) {
that.mapctx.getscale({
success(res2) {
query.exec((res) => {
let width = res[0].width;
let height = res[0].height;
let _markers = markers(res1.northeast, res1.southwest, res2.scale, width, height)
that.data.markers = _markers
that.setdata(that.data)
})
}
})
}
})
},
regionchange(e) {
this.createmarkers()
},
markertap(e) {
console.log(e.markerid)
},
controltap(e) {
console.log(e.controlid)
},
onready(e) {
this.createmarkers()
}
})
效果如图
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