gpt4 book ai didi

javascript - 从 Google map 中删除标记

转载 作者:太空宇宙 更新时间:2023-11-04 15:58:55 25 4
gpt4 key购买 nike

如果这是一个非常简单的问题并且我很愚蠢,我很抱歉,但我这里有一些代码,我正在从 MYSQL 中提取数据并将标记放置在 map 中。我的标记位置发生了变化,所以我想更新标记位置而不重新加载页面。一切正常,但是在放置新标记之前我无法删除以前的标记。

正如您在我的代码中看到的,我什至尝试放置一个按钮(不是我需要的,只是为了看看我是否可以让它工作)来清除标记,但这甚至不起作用。

任何帮助将不胜感激:)

这是我的代码:

<!DOCTYPE html >
<head>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
<meta http-equiv="content-type" content="text/html; charset=UTF-8"/>
<title>vRAF Link 16 Map</title>
<style>
/* Always set the map height explicitly to define the size of the div
* element that contains the map. */
#map {
height: 100%;
}
/* Optional: Makes the sample page fill the window. */
html, body {
height: 100%;
margin: 0;
padding: 0;
}

#floating-panel {
position: absolute;
top: 10px;
left: 25%;
z-index: 5;
background-color: #fff;
padding: 5px;
border: 1px solid #999;
text-align: center;
font-family: 'Roboto','sans-serif';
line-height: 30px;
padding-left: 10px;
}

</style>
<script type="text/javascript" src="http://maps.googleapis.com/maps/api/js?sensor=false"></script>
<script type="text/javascript">
//<![CDATA[
var markers = [];
setInterval(function () {
DeleteMarkers();
Link16_2();
}, 5000);

function DeleteMarkers() {
//Loop through all the markers and remove
for (var i = 0; i < markers.length; i++) {
markers[i].setMap(null);
}


markers = [];
};

var customIcons = {
bar: {
icon: 'http://map.vraf.net/icon.png'
}

};

var map = null;
var infoWindow = null;
function load() {
map = new google.maps.Map(document.getElementById("map"), {
center: new google.maps.LatLng(54.559322, -4.174804),
zoom: 6,
mapTypeId: 'satellite'
});


infoWindow = new google.maps.InfoWindow;

// Change this depending on the name of your PHP file
Link16_2();
}

function Link16_2() {
// Change this depending on the name of your PHP file
downloadUrl("genxml_link16.php", function(data) {
var xml = data.responseXML;
var markers = xml.documentElement.getElementsByTagName("marker");

for (var i = 0; i < markers.length; i++) {

var name = markers[i].getAttribute("name");
var callsign = markers[i].getAttribute("callsign");
var symbol = markers[i].getAttribute("symbol");

var point = new google.maps.LatLng(
parseFloat(markers[i].getAttribute("lat")),
parseFloat(markers[i].getAttribute("lon")));

var html = "<b>" + callsign + "</b> <br/>" + name;
var icon = customIcons[symbol] || {};
var marker = new google.maps.Marker({
map: map,
position: point,
icon: icon.icon
});

markers.push(marker);


bindInfoWindow(marker, map, infoWindow, html);
}
});
}

function bindInfoWindow(marker, map, infoWindow, html) {
google.maps.event.addListener(marker, 'click', function() {
infoWindow.setContent(html);
infoWindow.open(map, marker);
});
}

function downloadUrl(url, callback) {
var request = window.ActiveXObject ?
new ActiveXObject('Microsoft.XMLHTTP') :
new XMLHttpRequest;

request.onreadystatechange = function () {
if (request.readyState == 4) {
request.onreadystatechange = doNothing;
callback(request, request.status);
}
};

request.open('GET', url, true);
request.send(null);
}

function doNothing() { }


//




//HOT KEYS

// Removes the markers from the map, but keeps them in the array.
function clearMarkers() {
setMapOnAll(null);
}

// Shows any markers currently in the array.
function showMarkers() {
setMapOnAll(map);
}

// Deletes all markers in the array by removing references to them.
function deleteMarkers() {
clearMarkers();
markers = [];
}

// Deletes all markers in the array by removing references to them
function deleteOverlays() {
if (markers) {
for (i in markers) {
markers[i].setMap(null);
}
markers.length = 0;
}
}

</script>

</head>

<body onload="load()">

<div id="floating-panel">
<input onclick="clearMarkers();" type=button value="Hide Markers">
<input onclick="showMarkers();" type=button value="Show All Markers">
<input onclick="deleteOverlays();" type=button value="Delete Markers">
</div>
<div id="map">

</div>
</body>

</html>

最佳答案

您有两个名为 markers 的数组,一个位于 downloadUrl 本地的 XML 元素数组。函数和您可能想要的全局数组 google.maps.Marker对象。给它们起不同的名字。

var gmarkers = [];

内部downloadUrl :

gmarkers.push(marker);

DeleteMarkers :

function DeleteMarkers() {
//Loop through all the markers and remove
for (var i = 0; i < gmarkers.length; i++) {
gmarkers[i].setMap(null);
}
gmarkers = [];
};

proof of concept fiddle

关于javascript - 从 Google map 中删除标记,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/42450099/

25 4 0
Copyright 2021 - 2024 cfsdn All Rights Reserved 蜀ICP备2022000587号
广告合作:1813099741@qq.com 6ren.com