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我正在开发一个管理员可以添加属性到他的项目页面的房地产网站。现在他应该选择的其中一个选项是添加他宣传的房产的位置。在我的CMS平台上，我有地图，管理员将他的别针放到他的特定属性，然后保存。之后，进入该网站的预期客户将看到管理员之前放置的针。如何在标记上居中显示google ap3地图？
这里是我的管理部分的代码
HTML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>Google Maps JavaScript API v3 Example: Map Simple</title>
<script type="text/javascript" src="http://maps.googleapis.com/maps/api/js?sensor=true"></script>
<script type="text/javascript">
var marker;
var infowindow;
function initialize() {
var latlng = new google.maps.LatLng(30.0599153,31.2620199,13);
var options = {
zoom: 13,
center: latlng,
mapTypeId: google.maps.MapTypeId.ROADMAP
}
var map = new google.maps.Map(document.getElementById("map-canvas"), options);
var html = "<table>" +
"<tr><td>Name:</td> <td><input type='text' id='name'/> </td> </tr>" +
"<tr><td>Address:</td> <td><input type='text' id='address'/></td> </tr>" +
"<tr><td>Type:</td> <td><select id='type'>" +
"<option value='bar' SELECTED>bar</option>" +
"<option value='restaurant'>restaurant</option>" +
"</select> </td></tr>" +
"<tr><td></td><td><input type='button' value='Save & Close' onclick='saveData()'/></td></tr>";
infowindow = new google.maps.InfoWindow({
content: html
});
google.maps.event.addListener(map, "click", function(event) {
marker = new google.maps.Marker({
position: event.latLng,
map: map
});
google.maps.event.addListener(marker, "click", function() {
infowindow.open(map, marker);
});
});
}
function saveData() {
var name = escape(document.getElementById("name").value);
var address = escape(document.getElementById("address").value);
var type = document.getElementById("type").value;
var latlng = marker.getPosition();
var url = "phpsqlinfo_addrow.php?name=" + name + "&address=" + address +
"&type=" + type + "&lat=" + latlng.lat() + "&lng=" + latlng.lng();
downloadUrl(url, function(data, responseCode) {
if (responseCode == 200 && data.length <= 1) {
infowindow.close();
document.getElementById("message").innerHTML = "Location added.";
}
});
}
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.responseText, request.status);
}
};
request.open('GET', url, true);
request.send(null);
}
function doNothing() {}
</script>
</head>
<body style="margin:0px; padding:0px;" onload="initialize()">
<div id="map-canvas" style="width: 800px; height: 600px"></div>
<div id="message"></div>
</body>
</html>
然后它涉及到PHP代码管理将信息添加到数据库的动态部分：
<?php
// Gets data from URL parameters
$name = $_GET['name'];
$address = $_GET['address'];
$lat = $_GET['lat'];
$lng = $_GET['lng'];
$type = $_GET['type'];
mysql_connect("localhost", "root", "") or
die("Could not connect: " . mysql_error());
mysql_select_db("arabia");
// Insert new row with user data
$query = sprintf("INSERT INTO markers " .
" (id, name, address, lat, lng, type) " .
" VALUES (NULL, '%s', '%s', '%s', '%s', '%s');",
mysql_real_escape_string($name),
mysql_real_escape_string($address),
mysql_real_escape_string($lat),
mysql_real_escape_string($lng),
mysql_real_escape_string($type));
$result = mysql_query($query);
if (!$result) {
die('Invalid query: ' . mysql_error());
}
?>
现在来到客户部分。
其中有问题的客户端部分的HTML，客户端看到的地图从这里
<!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>map</title>
<script type="text/javascript" src="http://maps.googleapis.com/maps/api/js?sensor=false"></script>
<script type="text/javascript">
//<![CDATA[
var customIcons = {
restaurant: {
icon: 'http://labs.google.com/ridefinder/images/mm_20_blue.png'
},
bar: {
icon: 'http://labs.google.com/ridefinder/images/mm_20_red.png'
}
};
function load() {
var map = new google.maps.Map(document.getElementById("map"), {
center: new google.maps.LatLng(30.0599153,31.2620199,13)||map.setCenter(marker.getPosition()),
zoom: 13,
mapTypeId: 'roadmap'
});
var infoWindow = new google.maps.InfoWindow;
// Change this depending on the name of your PHP file
downloadUrl("phpsqlajax_genxml.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 address = markers[i].getAttribute("address");
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> <br/>" + address;
var icon = customIcons[type] || {};
var marker = new google.maps.Marker({
map: map,
position: point,
icon: icon.icon
});
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() {}
//]]>
</script>
</head>
<body onload="load()">
<div id="map" style="width: 500px; height: 300px"></div>
</body>
</html>
现在最后PHP部分女巫管理从数据库中获取数据：
<?php
// Start XML file, create parent node
$dom = new DOMDocument("1.0");
$node = $dom->createElement("markers");
$parnode = $dom->appendChild($node);
// Opens a connection to a MySQL server
mysql_connect("localhost", "root", "") or
die("Could not connect: " . mysql_error());
mysql_select_db("arabia");
// Select all the rows in the markers table
$query = "SELECT * FROM markers WHERE 1";
$result = mysql_query($query);
if (!$result) {
die('Invalid query: ' . mysql_error());
}
header("Content-type: text/xml");
// Iterate through the rows, adding XML nodes for each
while ($row = @mysql_fetch_assoc($result)){
// ADD TO XML DOCUMENT NODE
$node = $dom->createElement("marker");
$newnode = $parnode->appendChild($node);
$newnode->setAttribute("name",$row['name']);
$newnode->setAttribute("address", $row['address']);
$newnode->setAttribute("lat", $row['lat']);
$newnode->setAttribute("lng", $row['lng']);
$newnode->setAttribute("type", $row['type']);
}
echo $dom->saveXML();
?>
现在一切运行良好，使用此代码，整个问题都在客户端视图中心的HTML代码行中：
新 google.maps.LatLng（30.0599153,31.2620199,13）|| map.setCenter（marker.getPosition（）），
，我需要它的引脚管理员之前戴上中心。
看来我误解了你的问题。你从数据库中读取了多少个标记。一个还是很多？如果你有很多标记，你怎么知道哪一个用于中心？你使用'type'属性吗？ –
@AntoJurković您从数据库中读取了多少个标记？对于每个项目将是一张地图，所以项目将通过项目ID读取一张地图。 – Mikky