Javascript GoogleMapsAPI:创建加载标记的函数,以便可以使用setInterval调用它来更新XML的位置
我创建了一个文件,将标记加载到Google Maps JavaScript API画布中。 标记是从一个XML文件生成的,该文件从SQL获取标记信息 我希望能够调用函数ex.loadMarkers(),以便在SQL数据发生更改时更新标记位置 现在,我可以再次调用load(),但它会刷新整个地图,而不仅仅是标记。就像一个网站的硬刷新 如何包装插入标记的代码,以便将其作为函数调用Javascript GoogleMapsAPI:创建加载标记的函数,以便可以使用setInterval调用它来更新XML的位置,javascript,php,xml,google-maps,Javascript,Php,Xml,Google Maps,我创建了一个文件,将标记加载到Google Maps JavaScript API画布中。 标记是从一个XML文件生成的,该文件从SQL获取标记信息 我希望能够调用函数ex.loadMarkers(),以便在SQL数据发生更改时更新标记位置 现在,我可以再次调用load(),但它会刷新整个地图,而不仅仅是标记。就像一个网站的硬刷新 如何包装插入标记的代码,以便将其作为函数调用 <!DOCTYPE html > <head> <meta name="
<!DOCTYPE html >
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="content-type" content="text/html; charset=UTF-8"/>
<style>
#map {
height: 100%;
}
html, body {
height: 100%;
margin: 0;
padding: 0;
}
</style>
<script type="text/javascript">
var customIcons = {
user: {
icon: 'http://maps.google.com/mapfiles/kml/shapes/man.png'
},
store: {
icon: 'http://maps.google.com/mapfiles/kml/shapes/grocery.png'
}
};
function load() {
var map = new google.maps.Map(document.getElementById("map"), {
center: new google.maps.LatLng(59.914045, 10.756808),
zoom: 12,
mapTypeId: 'roadmap',
mapTypeControl: false,
streetViewControl: false,
zoomControl: false,
fullscreenControl: false
});
// here I want a function that pushes the markers by calling ex. setMarkers() function, that can be called later by setInterval(function() {setMarkers();},3000) to update markers location if the xml is changed
downloadUrl("xml.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 type = markers[i].getAttribute("type");
var point = new google.maps.LatLng(
parseFloat(markers[i].getAttribute("lat")),
parseFloat(markers[i].getAttribute("lng")));
var html = "<b>" + name + "</b>";
var icon = customIcons[type] || {};
var marker = new google.maps.Marker({
map: map,
position: point,
icon: icon.icon,
draggable: false,
animation: google.maps.Animation.DROP,
});
} // for each markers
}); //download url
} // load();
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() {}
**//This is the function I want to update the markers with, without having to do a hard refresh of the site.**
setInterval(function() {setMarkers();},3000);
</script>
</head>
<body onload="load()">
<div id="map"></div>
</body>
<script async defer
src="https://maps.googleapis.com/maps/api/js?key=<?php echo $api_key; ?>&callback=initMap">
</script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
<script type="text/javascript" src="http://maps.googleapis.com/maps/api/js sensor=false"></script>
</html>
#地图{
身高:100%;
}
html,正文{
身高:100%;
保证金:0;
填充:0;
}
var customIcons={
用户:{
图标:'http://maps.google.com/mapfiles/kml/shapes/man.png'
},
商店:{
图标:'http://maps.google.com/mapfiles/kml/shapes/grocery.png'
}
};
函数加载(){
var map=new google.maps.map(document.getElementById(“map”){
中心:新google.maps.LatLng(59.914045,10.756808),
缩放:12,
mapTypeId:“路线图”,
mapTypeControl:false,
街景控制:错误,
动物控制:错误,
fullscreenControl:错误
});
//这里我需要一个函数,通过调用ex.setMarkers()函数来推送标记,如果xml发生更改,setInterval(function(){setMarkers();},3000)可以稍后调用该函数来更新标记位置
下载URL(“xml.php”,函数(数据){
var xml=data.responseXML;
var markers=xml.documentElement.getElementsByTagName(“标记”);
对于(var i=0;i创建一个函数(setMarkers
),该函数执行downloadUrl调用以加载XML并在地图上创建标记
- 将map变量设为全局变量或将其传递给该函数
- 创建一个全局数组来跟踪这些标记,以便在加载新标记之前删除它们
var gmarkers = [];
function setMarkers() {
downloadUrl(urlString, function(data) {
var xml = data.responseXML;
for (var i=0; i<gmarkers.length; i++)
gmarkers[i].setMap(null);
gmarkers = [];
var markers = xml.documentElement.getElementsByTagName("marker");
for (var i = 0; i < markers.length; i++) {
var name = markers[i].getAttribute("name");
var type = markers[i].getAttribute("type");
var point = new google.maps.LatLng(
parseFloat(markers[i].getAttribute("lat")),
parseFloat(markers[i].getAttribute("lng")));
var html = "<b>" + name + "</b>";
var icon = customIcons[type] || {};
var marker = new google.maps.Marker({
map: map,
position: point,
icon: icon.icon,
draggable: false,
animation: google.maps.Animation.DROP,
});
gmarkers.push(marker);
} // for each markers
}); //download url
}
var map;
function load() {
map = new google.maps.Map(document.getElementById("map"), {
center: new google.maps.LatLng(59.914045, 10.756808),
zoom: 12,
mapTypeId: 'roadmap',
mapTypeControl: false,
streetViewControl: false,
zoomControl: false,
fullscreenControl: false
});
setMarkers();
} // load();
setInterval(function() {
setMarkers();
},3000);