图层未被移除 - Google地图 [英] Layer not getting removed - Google Maps
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问题描述
我有Google Maps:
<!DOCTYPE html>
< html>
< head>
< meta name =viewportcontent =initial-scale = 1.0,user-scalable = no>
< meta charset =utf-8>
< title> Fusion Tables图层< / title>
< style>
html,body {
height:100%;
保证金:0;
padding:0;
}
#map {
height:100%;
}
< / style>
< / head>
< body>
< div id =map>< / div>
< script>
函数initMap(){
var map = new google.maps.Map(document.getElementById('map'),{
zoom:4,
center:{lat: 39.8282,lng:-98.5795}
});
google.maps.event.addListener(map,'zoom_changed',function(){
var zoom_level = map.getZoom();
var layer;
(zoom_level> = 5&& zoom_level< 7){
layer = new google.maps.FusionTablesLayer({
查询:{
select:'\'geometry \'',
from:'17aT9Ud-YnGiXdXEJUyycH2ocUqreOeKGbzCkUw'
},
styles:[{
polygonOptions:{
fillColor:'#000000',
fillOpacity:0.001
}
}]
});
layer.setMap(map);
}
//县级
if(zoom_level> = 7){
layer = null;
layer.setMap(null);
layer1 = new google.maps.FusionTablesLayer({
查询:{
select:'\'geometry \'',
from:'1xdysxZ94uUFIit9eXmnw1fYc6VcQiXhceFd_CVKa'
},
styles:[{
polygonOptions: {
fillColor:'#000000',
fillOpacity:0.001
}
}]
});
layer1.setMap(map);
}
});
}
< / script>
< script async defer
src =https://maps.googleapis.com/maps/api/js?key=AIzaSyBMtoh9P3UkoxbXndKu_HOP7KsVwTRvxGU&callback=initMap>
< / script>
< / body>
< / html>
当我放大缩放级别7和更高级别时,我仍然可以看到状态级别(层)而不是layer1 。如何在放大时重置图层?
解决方案
我会建议如果您只想要一层图层,创建一个,在创建新版本之前隐藏它。
google.maps.event.addListener(map,'zoom_changed',function (){
var zoom_level = map.getZoom();
if(layer)layer.setMap(null);
//状态级别
if(zoom_level> = 5 && zoom_level< 7){
layer = new google.maps.FusionTablesLayer({
query:{
select:'\'geometry \'',
from:'17aT9Ud-YnGiXdXEJUyycH2ocUqreOeKGbzCkUw'
},
styles:[{
polygonOptions:{
fillColor:'#000000',
fillOpacity:0.001 $ b $ (b)如果(zoom_level> = 7)b
$ b $ ){
layer = new google.maps.FusionTablesLayer({
quer y:{
select:'\'geometry \'',
from:'1xdysxZ94uUFIit9eXmnw1fYc6VcQiXhceFd_CVKa'
},
styles:[{
polygonOptions:{
fillColor:'#000000',
fillOpacity:0.001
}
}]
});
layer.setMap(map);
}
});
代码段:
var layer; var layer1; var map;函数initMap(){map = new google.maps.Map(document.getElementById('map '),{zoom:4,center:{lat:39.8282,lng:-98.5795}}); google.maps.event.addListener(map,'zoom_changed',function(){var zoom_level = map.getZoom(); if(layer)layer.setMap(null); //状态级别if(zoom_level> = 5& amp ;& zoom_level< 7){layer = new google.maps.FusionTablesLayer({query:{select:'\'geometry \'',from:'17aT9Ud-YnGiXdXEJUyycH2ocUqreOeKGbzCkUw'},styles:[{polygonOptions:{ fillColor:'#000000',fillOpacity:0.001}}]}); layer.setMap(map);} //县级别if(zoom_level> = 7){layer = new google.maps.FusionTablesLayer({query:{选择:'\'geometry\'',from:'1xdysxZ94uUFIit9eXmnw1fYc6VcQiXhceFd_CVKa'},styles:[{polygonOptions:{fillColor:'#000000',fillOpacity:0.001}})}); layer.setMap(map);} });} google.maps.event。 addDomListener(window,load,initMap);
html ,身体{身高:100%;保证金:0; padding:0;}#map {height:100%;}
< script src =https://maps.googleapis.com/maps/api/js>< / script>< div id =map>< / div>
I have Google Maps:
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no">
<meta charset="utf-8">
<title>Fusion Tables layers</title>
<style>
html, body {
height: 100%;
margin: 0;
padding: 0;
}
#map {
height: 100%;
}
</style>
</head>
<body>
<div id="map"></div>
<script>
function initMap() {
var map = new google.maps.Map(document.getElementById('map'), {
zoom: 4,
center: {lat: 39.8282, lng: -98.5795}
});
google.maps.event.addListener(map, 'zoom_changed', function() {
var zoom_level = map.getZoom();
var layer;
var layer1;
//state level
if(zoom_level >= 5 && zoom_level < 7) {
layer = new google.maps.FusionTablesLayer({
query: {
select: '\'geometry\'',
from: '17aT9Ud-YnGiXdXEJUyycH2ocUqreOeKGbzCkUw'
},
styles: [{
polygonOptions: {
fillColor: '#000000',
fillOpacity: 0.001
}
}]
});
layer.setMap(map);
}
//county level
if(zoom_level >= 7) {
layer = null;
layer.setMap(null);
layer1 = new google.maps.FusionTablesLayer({
query: {
select: '\'geometry\'',
from: '1xdysxZ94uUFIit9eXmnw1fYc6VcQiXhceFd_CVKa'
},
styles: [{
polygonOptions: {
fillColor: '#000000',
fillOpacity: 0.001
}
}]
});
layer1.setMap(map);
}
});
}
</script>
<script async defer
src="https://maps.googleapis.com/maps/api/js?key=AIzaSyBMtoh9P3UkoxbXndKu_HOP7KsVwTRvxGU&callback=initMap">
</script>
</body>
</html>
When I zoom in to zoomlevel 7 and above, I still see state level (layer) and not layer1. How can I reset layer when zoom in?
解决方案
I would suggest that if you only ever want one layer at a time, only create one, hide it before creating a new version.
google.maps.event.addListener(map, 'zoom_changed', function() {
var zoom_level = map.getZoom();
if (layer) layer.setMap(null);
//state level
if (zoom_level >= 5 && zoom_level < 7) {
layer = new google.maps.FusionTablesLayer({
query: {
select: '\'geometry\'',
from: '17aT9Ud-YnGiXdXEJUyycH2ocUqreOeKGbzCkUw'
},
styles: [{
polygonOptions: {
fillColor: '#000000',
fillOpacity: 0.001
}
}]
});
layer.setMap(map);
}
//county level
if (zoom_level >= 7) {
layer = new google.maps.FusionTablesLayer({
query: {
select: '\'geometry\'',
from: '1xdysxZ94uUFIit9eXmnw1fYc6VcQiXhceFd_CVKa'
},
styles: [{
polygonOptions: {
fillColor: '#000000',
fillOpacity: 0.001
}
}]
});
layer.setMap(map);
}
});
code snippet:
var layer;
var layer1;
var map;
function initMap() {
map = new google.maps.Map(document.getElementById('map'), {
zoom: 4,
center: {
lat: 39.8282,
lng: -98.5795
}
});
google.maps.event.addListener(map, 'zoom_changed', function() {
var zoom_level = map.getZoom();
if (layer) layer.setMap(null);
//state level
if (zoom_level >= 5 && zoom_level < 7) {
layer = new google.maps.FusionTablesLayer({
query: {
select: '\'geometry\'',
from: '17aT9Ud-YnGiXdXEJUyycH2ocUqreOeKGbzCkUw'
},
styles: [{
polygonOptions: {
fillColor: '#000000',
fillOpacity: 0.001
}
}]
});
layer.setMap(map);
}
//county level
if (zoom_level >= 7) {
layer = new google.maps.FusionTablesLayer({
query: {
select: '\'geometry\'',
from: '1xdysxZ94uUFIit9eXmnw1fYc6VcQiXhceFd_CVKa'
},
styles: [{
polygonOptions: {
fillColor: '#000000',
fillOpacity: 0.001
}
}]
});
layer.setMap(map);
}
});
}
google.maps.event.addDomListener(window, "load", initMap);
html,
body {
height: 100%;
margin: 0;
padding: 0;
}
#map {
height: 100%;
}
<script src="https://maps.googleapis.com/maps/api/js"></script>
<div id="map"></div>
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