下午好,我创建了一个地图,该地图直接从mysql数据库中用坐标填充了标记,该地图已正确生成,并且在加载页面时标记可以工作。每分钟我都会在库中获得新的坐标,并希望以一定的时间间隔更新地图。为此,我使用了setInterval来调用标记的初始化函数,但是,它并未在地图上创建新的标记,而是始终显示相同的标记,仅当我在页面上输入f5时它们才会更新,即,如果重新加载页面有效,但没有间隔。他甚至在时间间隔设定的时间眨眨眼,但没有更新。
我的代码:
<script src="js/markerclusterer.js"></script>
<script src="js/jquery-1.5.2.min.js"></script>
<script src="js/jquery.maskedinput-1.3.min.js"></script>
<script src="https://maps.googleapis.com/maps/api/js?v=3.exp"></script>
<script>
<?php
if($attmap_form > 0) {
echo 'myTimer = window.setInterval(refreshMapa,"'.$attmap_form.'");';
}
?>
function initialize() {
var mapOptions = {
zoom: 12,
center: new google.maps.LatLng(-25.4848801,-49.2918938),
mapTypeId: google.maps.MapTypeId.ROADMAP
};
map = new google.maps.Map(document.getElementById('map-canvas'), mapOptions);
locations = [];
<?php
require('conecta.php');
$sql_lista = ("SELECT MONITLATITUDE,MONITLONGITUDE,MONITDATA,MONITHORA,MONITRAIO,MONITPROVEDOR,MONITVELOCIDADE FROM MONITORAMENTO where MONITHORA BETWEEN '$hora1_form' AND '$hora2_form' AND MONITDATA BETWEEN '$data1_form' AND '$data2_form' AND EQUIPIMEI = $imei");
$query_lista = mysql_query($sql_lista);
$achados_lista = mysql_num_rows($query_lista);
while ($achados_lista = mysql_fetch_array($query_lista)) {
$lat = $achados_lista['MONITLATITUDE'];
$lon = $achados_lista['MONITLONGITUDE'];
$Data = $achados_lista['MONITDATA'];
$hora = $achados_lista['MONITHORA'];
$raio = $achados_lista['MONITRAIO'];
$provedor = $achados_lista['MONITPROVEDOR'];
$velocidade = $achados_lista['MONITVELOCIDADE'];
echo 'locations.push ( {Data:"'.$Data.'", latlng: new google.maps.LatLng('.$lat.', '.$lon.'), hora:"'.$hora.'", raio:"'.$raio.'",provedor:"'.$provedor.'",velocidade:"'.$velocidade.'"} );';
}
?>
var bounds = new google.maps.LatLngBounds();
var infowindow = new google.maps.InfoWindow();
var markers = [];
for(var i=0;i < locations.length;i++ ) {
var marker = new google.maps.Marker({
position: locations[i].latlng,
map:map,
title:locations[i].hora
});
markers.push(marker);
bounds.extend(locations[i].latlng);
google.maps.event.addListener(marker, 'click', (function(marker, i) {
return function() {
infowindow.setContent(
'<strong>Data: ' + locations[i].Data + '<br>Hora: ' + locations[i].hora + '<br></strong>Velocidade aproximada: ' + locations[i].velocidade + ' K/H<br>Raio aproximado de: ' + locations[i].raio + ' metros <br>Provedor: ' + locations[i].provedor + '<br>Latitude: ' + locations[i].latlng
);
infowindow.open(map, marker);
}
})(marker, i));
}
markerClusterer = new MarkerClusterer(map, markers, {
maxZoom: 16,
gridSize: 60
});
map.fitBounds(bounds);
}
arrancaMapa();
function arrancaMapa() {
google.maps.event.addDomListener(window, 'load', initialize);
}
function refreshMapa() {
initialize();
arrancaMapa();
}
function clearMarkers() {
setAllMap(null);
}
function stopTimer() {
$("#campoAttMap").val("0");
clearInterval(myTimer);
}
</script>
参考方案
您不必多次调用initialize。您应该实施其他逻辑,例如,获取地图中未包含的最新标记,然后通过添加
var marker = new google.maps.Marker({
position: locations[i].latlng,
map:map,
title:locations[i].hora
});
markers.push(marker);
bounds.extend(locations[i].latlng);
google.maps.event.addListener(marker, 'click', (function(marker, i) {
return function() {
infowindow.setContent(
'<strong>Data: ' + locations[i].Data + '<br>Hora: ' + locations[i].hora + '<br></strong>Velocidade aproximada: ' + locations[i].velocidade + ' K/H<br>Raio aproximado de: ' + locations[i].raio + ' metros <br>Provedor: ' + locations[i].provedor + '<br>Latitude: ' + locations[i].latlng
);
infowindow.open(map, marker);
}
})(marker, i));
更新:
我将添加以下方法。我不喜欢将PHP和Javascript混合在一起,我更喜欢使用JSON和AJAX请求。
更新您的函数,如下所示:
var map;
var markers = [];
setInterval(refreshMapa, 3000);
function initialize() {
var mapOptions = {
zoom: 12,
center: new google.maps.LatLng(-25.4848801,-49.2918938),
mapTypeId: google.maps.MapTypeId.ROADMAP
};
map = new google.maps.Map(document.getElementById('map-canvas'), mapOptions);
var locations = [];
$.get("getmarkers.php", function(response){
for(var i = 0; i < response.markers.length; i++) {
var marker = response.markers[i];
var myMarker = {
Data: marker.Data,
latlng: new google.maps.LatLng(marker.lat, marker.lon),
hora: marker.hora,
raio: marker.raio,
provedor: marker.provedor,
velocidade: marker.velocidade
};
locations.push(myMarker);
addMapMarker(myMarker);
}
},'json');
markerClusterer = new MarkerClusterer(map, markers, {
maxZoom: 16,
gridSize: 60
});
map.fitBounds(bounds);
}
function refreshMapa() {
// make sure this one only returns markers that are new and not in the map
$.get("getnewmarkers.php", function(){
for(var i = 0; i < response.markers.length; i++) {
var marker = response.markers[i];
var myMarker = {
Data: marker.Data,
latlng: new google.maps.LatLng(marker.lat, marker.lon),
hora: marker.hora,
raio: marker.raio,
provedor: marker.provedor,
velocidade: marker.velocidade
};
locations.push(myMarker);
addMapMarker(myMarker);
}, 'json');
}
function addMapMarker(myMarker) {
var marker = new google.maps.Marker({
position: myMarker.latlng,
map:map,
title:myMarker.hora
});
markers.push(marker);
bounds.extend(myMarker.latlng);
google.maps.event.addListener(marker, 'click', (function(marker, i) {
return function() {
infowindow.setContent('<strong>Data: ' + myMarker.Data + '<br>Hora: ' + myMarker.hora + '<br></strong>Velocidade aproximada: ' + myMarker.velocidade + ' K/H<br>Raio aproximado de: ' + myMarker.raio + ' metros <br>Provedor: ' + myMarker.provedor + '<br>Latitude: ' + myMarker.latlng);
infowindow.open(map, marker);
}
})(marker, i));
}
PS:我不确定addMapMarker的实现是否正确(我只是假设您一开始就正确),您应该检查文档并确保它正确。
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