Javascript 使用php sql从数据库中创建google地图标记
我有这段代码来从GoogleMap上的数据库填充标记,但它不起作用,xml文件完全起作用,我提到过,但没有任何用处 markers.php代码Javascript 使用php sql从数据库中创建google地图标记,javascript,php,sql,google-maps,Javascript,Php,Sql,Google Maps,我有这段代码来从GoogleMap上的数据库填充标记,但它不起作用,xml文件完全起作用,我提到过,但没有任何用处 markers.php代码 <?php $servername = "localhost"; $username = "root"; $password = ""; $dbname = "jainmunilocator"; $connection=mysqli_connect($servername, $username, $password, $dbname);; if (
<?php
$servername = "localhost";
$username = "root";
$password = "";
$dbname = "jainmunilocator";
$connection=mysqli_connect($servername, $username, $password, $dbname);;
if (!$connection) {
die("Connection failed: " . mysqli_connect_error());
}
$sql = "SELECT name,id,lat,lng FROM muni_location,munishri WHERE mid=id";
header('Content-Type: application/xml');
$result=mysqli_query($connection,$sql);
$dom = new DOMDocument("1.0");
$node = $dom->createElement("markers");
$parnode = $dom->appendChild($node);
if (mysqli_num_rows($result) > 0)
{
while($row = mysqli_fetch_assoc($result)){
if(isset($row['id'])){ $id = $row['id']; }
if(isset($row['name'])){ $name = $row['name']; }
if(isset($row['lat'])){ $lat = $row['lat']; }
if(isset($row['lng'])){ $lng = $row['lng']; }
$node = $dom->createElement("marker");
$newnode = $parnode->appendChild($node);
$newnode->setAttribute("id",$id);
$newnode->setAttribute("name", $name);
$newnode->setAttribute("lat", $lat);
$newnode->setAttribute("lng", $lng);
}
}
echo $dom->saveXML();
?>
createElement(“标记”);
$parnode=$dom->appendChild($node);
如果(mysqli_num_行($result)>0)
{
while($row=mysqli\u fetch\u assoc($result)){
if(isset($row['id']){$id=$row['id'];}
if(isset($row['name']){$name=$row['name'];}
if(isset($row['lat']){$lat=$row['lat'];}
如果(isset($row['lng']){$lng=$row['lng'];}
$node=$dom->createElement(“标记”);
$newnode=$parnode->appendChild($node);
$newnode->setAttribute(“id”,$id);
$newnode->setAttribute(“名称”,$name);
$newnode->setAttribute(“lat”,$lat);
$newnode->setAttribute(“lng”,$lng);
}
}
echo$dom->saveXML();
?>
*谷歌地图标记代码**
<!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>PHP/MySQL & Google Maps Example</title>
<script type="text/javascript" src="https://maps.googleapis.com/maps/api/js"></script>
<script type="text/javascript">
//<![CDATA[
function load() {
var map = new google.maps.Map(document.getElementById("map"), {
center: new google.maps.LatLng(22.6145,77.3418),
zoom: 7,
mapTypeId: 'roadmap'
});
var infoWindow = new google.maps.InfoWindow;
var gm_marker = new Array();
// Change this depending on the name of your PHP file
downloadUrl("markers.php", function(data) {
var xml = data.responseXML;
var markers = xml.documentElement.getElementsByTagName("marker");
for (var i = 0; i < markers.length; i++) {
var id = markers[i].getAttribute("id");
var name = markers[i].getAttribute("name");
var point = new google.maps.LatLng(
parseFloat(markers[i].getAttribute("lat")),
parseFloat(markers[i].getAttribute("lng")));
//var html = "<b>" + name + "</b> <br/>" + id;
var html = name;
var icon = 'http://labs.google.com/ridefinder/images/mm_20_blue.png';
var marker = new google.maps.Marker({
map: map,
position: point,
title: name
});
addMarker(point,name);
bindInfoWindow(marker, map, infoWindow, html);
}
});
}
//stackoverflow
function addMarker(latLng, contentstr) {
var marker = new google.maps.Marker({
position: latLng,
map: map
});
google.maps.event.addListener(marker, 'click', function() {
infowindow = new google.maps.InfoWindow({
content: contentstr
});
});
gm_markers.push(marker);
}
setAllmap(map);
function setAllMap(map) {
for (var i = 0; i < gm_markers.length; i++) {
gm_markers[i].setMap(map);
}
function showMarkers() { setAllMap(map);}
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() {}
//]]>
</script>
</head>
<body onload="load()">
<div id="map-canvas-show" style="width: 100%; height: 300px;"></div>
</body>
</html>
PHP/MySQL和googlemaps示例
//
我认为有两个元素是必不可少的,我在您的代码中没有看到。这是我的资料来源,我把它们放在这里是为了展示概念。您可以在for循环中实现这种类型的东西,也可以分解成函数。我更喜欢函数,所以我这样做了
首先,我要确认标记数组的长度不是0——这是一个简单的健全性检查——确保要加载标记
构建GoogleMapMarker堆栈
虽然有标记
// Sets the map on all markers in the array.
function setAllMap(map) {
for (var i = 0; i < gm_markers.length; i++) {
gm_markers[i].setMap(map);
}
显示已加载的标记的步骤(打开)
在视图中
显示带有标记的地图
<div id="map-canvas-show" style="width: 100%; height: 300px;"></div>
调试步骤(已添加)
地图是否显示没有标记,或者什么都没有显示?地图正在显示,但是没有标记,并且markers.php工作正常?是的,工作正常生成的XML是什么样子的?请提供一个例子来说明这个问题。那太好了。请接受这一有用的答案好吗?检查新编辑的代码现在地图也正在加载,你能看看你在我的代码中提到的函数吗,而不知道你的眼镜地图javascript的输入我不会冒险猜测。我添加了几个调试想法。看看你能看到什么,我可以根据需要补充更多的答案。
// Removes the markers from the map, but keeps them in the array.
function clearMarkers() {
setAllMap(null);
}
// Shows any markers currently in the array.
function showMarkers() {
setAllMap(map);
}
<div id="map-canvas-show" style="width: 100%; height: 300px;"></div>