我正在用 phonegap for android 做两个 html5/javascript 应用程序,我让它们都通过 php 与 ajax 进行通信,在它们中我都使用 google maps api,我需要知道它们在哪里另一个人是,当一个人在移动而另一个人在等他时,我有两个问题:
在 app1(正在移动的那个)中,我需要在 map 上每 10 秒刷新一次标记,而不是加载整个页面。
我通过 ajax 加载,这两个应用程序的坐标都保存在 mysql 数据库中,因此我需要在每个 map 中设置第二个标记,作为其他应用程序的位置,并每 10 秒跟踪一次它的移动.
这就是我在每个应用程序中加载 map 的方式:
function getPos() {
navigator.geolocation.getCurrentPosition(onSuccess, onError, {enableHighAccuracy:true});
setTimeout(getPos, 10000); //call function after 10 seconds
}
function onSuccess(position) {
lat = position.coords.latitude;
lon = position.coords.longitude;
console.log("Found - LAT: ", lat, "LON: ", lon);
var currentposition = new google.maps.LatLng(lat,lon);
var mapoptions = {
zoom: 16,
center: currentposition,
mapTypeId: google.maps.MapTypeId.ROADMAP,
icon: image
};
var map = new google.maps.Map(document.getElementById("map"), mapoptions);
var marker = new google.maps.Marker({
position: currentposition,
map: map
});
save_position_in_bd();
}
function onError(error) {
console.log('code: ' + error.code, 'message: ' + error.message);
}
我正在使用 ajax POST 获取其他应用程序的位置:
$.ajax({
type: "POST",
url: "http://localhost/call.php",
data: "name=rui",
dataType: 'json',
success: function(data){
lat = data.lat;//get other apps lat
lon = data.lon;//get other apps lon
},
error: function(jqXHR, textStatus, errorThrown ){
console.log("POST: ", jqXHR, textStatus, errorThrown);
}
});
我能做些什么来解决我的问题?我尝试在不同的函数中刷新 map ,并尝试只加载标记,但它不起作用。 我正在使用的确切 api 是:
http://maps.googleapis.com/maps/api/js?sensor=false
解决了: 答案是将代码拆分成不同的函数并只调用标记,以便对其进行更新:
function getPos() {//initial function to read the position
estado = "livre";
navigator.geolocation.getCurrentPosition(onSuccess, onError, {enableHighAccuracy:true});
setTimeout(keep_alive, 10000); //read every 10 seconds
}
function onSuccess(position) {//read map and mark it in the map
lat = position.coords.latitude;
lon = position.coords.longitude;
console.log("Found - LAT: ", lat, "LON: ", lon);
var image = '/img/taxi_green.png';
var mapoptions = {
zoom: 16,
center: new google.maps.LatLng(lat,lon),
mapTypeId: google.maps.MapTypeId.ROADMAP,
icon: image
};
map = new google.maps.Map(document.getElementById("map"), mapoptions);
marker = new google.maps.Marker({
position: new google.maps.LatLng(lat,lon),
map: map
});
save_position();
}
function keep_alive() {//read position and mark it in the map
navigator.geolocation.getCurrentPosition(onRefresh, onError, {enableHighAccuracy:true});
save_position();
setTimeout(keep_alive, 10000); //read every 10 seconds
}
//refresh only the marker
function onRefresh(position) {
lat = position.coords.latitude;
lon = position.coords.longitude;
console.log("Found - LAT: ", lat, "LON: ", lon);
marker.setPosition(new google.maps.LatLng(lat, lon));//refresh marker
map.setCenter(new google.maps.LatLng(lat, lon));//resfresh center of the map
}
function trace_client() {//mark clients position in the map
//clientMarker.setPosition(new google.maps.LatLng(client_lat, client_lon));
clientMarker = new google.maps.Marker({
position: new google.maps.LatLng(client_lat,client_lon),
map: map
});
console.log("client marked in the map");
}
function onError(error) {
console.log('code: ' + error.code, 'message: ' + error.message);
}
最佳答案
为了更容易找到,这里是问题的解决方案。
答案是将代码拆分成不同的函数,只调用标记,以便对其进行更新:
function getPos() {//initial function to read the position
estado = "livre";
navigator.geolocation.getCurrentPosition(onSuccess, onError, {enableHighAccuracy:true});
setTimeout(keep_alive, 10000); //read every 10 seconds
}
function onSuccess(position) {//read map and mark it in the map
lat = position.coords.latitude;
lon = position.coords.longitude;
console.log("Found - LAT: ", lat, "LON: ", lon);
var image = '/img/taxi_green.png';
var mapoptions = {
zoom: 16,
center: new google.maps.LatLng(lat,lon),
mapTypeId: google.maps.MapTypeId.ROADMAP,
icon: image
};
map = new google.maps.Map(document.getElementById("map"), mapoptions);
marker = new google.maps.Marker({
position: new google.maps.LatLng(lat,lon),
map: map
});
save_position();
}
function keep_alive() {//read position and mark it in the map
navigator.geolocation.getCurrentPosition(onRefresh, onError, {enableHighAccuracy:true});
save_position();
setTimeout(keep_alive, 10000); //read every 10 seconds
}
//refresh only the marker
function onRefresh(position) {
lat = position.coords.latitude;
lon = position.coords.longitude;
console.log("Found - LAT: ", lat, "LON: ", lon);
marker.setPosition(new google.maps.LatLng(lat, lon));//refresh marker
map.setCenter(new google.maps.LatLng(lat, lon));//resfresh center of the map
}
function trace_client() {//mark clients position in the map
//clientMarker.setPosition(new google.maps.LatLng(client_lat, client_lon));
clientMarker = new google.maps.Marker({
position: new google.maps.LatLng(client_lat,client_lon),
map: map
});
console.log("client marked in the map");
}
function onError(error) {
console.log('code: ' + error.code, 'message: ' + error.message);
}
关于javascript - 刷新谷歌地图javascript ajax,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/17474550/