Google Maps JavaScript API v3 删除标记
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Google Maps JavaScript API v3 remove markers
提问by Russell Parrott
I have looked at a large number of "similar" questions and none of the solutions/answers seem to work for me so here we go: I am generating a simple Google Map with a single marker "onload" I then have a menu list a bit like this
我查看了大量“类似”问题，但似乎没有一个解决方案/答案对我有用，所以我们开始吧：我正在生成一个带有单个标记“onload”的简单 Google 地图，然后我有一个菜单列表有点像这样
<ul>
<li class="toggle" id="beaches">Item</li>
<li class="toggle" id="towns">Item</li>
<ul>
that on click uses these arrays to marker-populate the map
单击时使用这些数组来标记填充地图
jQuery -
jQuery -
$(".toggle").click(function(){
setMarkers(map,$(this).attr('id'));
});
var beaches = [
['Beach 1',38.285827, 20.611038, 4],
['Beach 2', 38.304958,20.604515, 5],
['Beach 3',38.301691,20.597649, 3]
];
var towns = [
['Town 1',38.343003, 20.535679, 4],
['Town 2',38.339334,20.545807, 5]
];
My population function looks like this:
我的人口函数如下所示：
function setMarkers(map, locations) {
for (var i = 0; i < locations.length; i++) {
var newmarker = locations[i];
var myLatLng = new google.maps.LatLng(newmarker[1], newmarker[2]);
var marker = new google.maps.Marker({
position: myLatLng,
map: map,
title: newmarker[0],
zIndex: newmarker[3]
});
}
But what I need/want to do is clear allmarkers first before adding the new ones. Suggestions please Thanks
但是我需要/想要做的是在添加新标记之前先清除所有标记。请给点建议谢谢
回答by Engineer
You need to store markers, and call setMap(null)for every marker to remove from map.
您需要存储标记，并要求setMap(null)从地图中删除每个标记。
You could try something like this:
你可以尝试这样的事情：
var setMarkers = (function() {
var oldMarkers = null;
return function(map, locations){
//Clearing markers, if they exist
if(oldMarkers && oldMarkers.length !== 0){
for(var i = 0; i < oldMarkers.length; ++i){
oldMarkers[i].setMap(null);
}
}
//Adding new markers
oldMarkers = [];
for (var i = 0; i < locations.length; i++) {
var newmarker = locations[i];
var myLatLng = new google.maps.LatLng(newmarker[1], newmarker[2]);
var marker = new google.maps.Marker({
position: myLatLng,
map: map,
title: newmarker[0],
zIndex: newmarker[3]
});
oldMarkers.push( marker );
}
};
})();
回答by lfergon
Maybe you could use one function that empty array that contains markers:
也许您可以使用一个包含标记的空数组的函数：
function clear(){
if(locations){
for(var i=0;i<location.length;i++){
locations[i].setMap(null);
}
locations.length=0;
}
}
回答by Shaun Hare
You need to make sure your markers are stored in a array and then to remove do some thing like
您需要确保您的标记存储在一个数组中，然后删除做一些像
// Sets the map on all markers in the array.
function removeMarkers {
for (var i = 0; i < markers.length; i++) {
markers[i].setMap(null);
}
markers.length=0;
}
So your code would now be
所以你的代码现在是
var markers [];
function setMarkers(map, locations) {
// remove all markers first
removeMarkers();
for (var i = 0; i < locations.length; i++) {
var newmarker = locations[i];
var myLatLng = new google.maps.LatLng(newmarker[1], newmarker[2]);
var marker = new google.maps.Marker({
position: myLatLng,
map: map,
title: newmarker[0],
zIndex: newmarker[3]
});
//add to marker array
markers.push(marker);
}
回答by Alex
You could define a global array of markers and clearing those by calling setMap(null)before you re-populate the map:
您可以定义一个全局标记数组，并setMap(null)在重新填充地图之前通过调用清除它们：
var markers = [];
function setMarkers(map, locations) {
for (var i = 0; i < locations.length; i++) {
var newmarker = locations[i];
var myLatLng = new google.maps.LatLng(newmarker[1], newmarker[2]);
if (markers[i]) {
markers[i].setMap(null);
}
markers[i] = new google.maps.Marker({
position: myLatLng,
map: map,
title: newmarker[0],
zIndex: newmarker[3]
});
}
}
