我正在尝试构建一个简单的网络“应用程序”，在其中我将有一个地图（使用谷歌地图 api）和它下面的一些链接作为“过滤器”。我想按类型（即：酒吧或餐厅）过滤数据。
基本上，map.html 页面使用 javascript 来获取由 PHP 脚本生成的 XML。
这是以下代码：
地图.hmtl：
<!doctype html>
<html>
<head>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
<meta http-equiv="content-type" content="text/html; charset=UTF-8" />
<script type="text/javascript" src="http://maps.googleapis.com/maps/api/js?key=AIzaSyASO80RjNn2d_Jjy9vdNHA5E3tfmALkWXw&sensor=false"></script>
<script type="text/javascript">
//<![CDATA[
var customIcons = {
restaurant: {
icon: 'http://labs.google.com/ridefinder/images/mm_20_blue.png',
shadow: 'http://labs.google.com/ridefinder/images/mm_20_shadow.png'
},
bar: {
icon: 'http://labs.google.com/ridefinder/images/mm_20_red.png',
shadow: 'http://labs.google.com/ridefinder/images/mm_20_shadow.png'
}
};
function load() {
var map = new google.maps.Map(document.getElementById("map"), {
center: new google.maps.LatLng(47.6145, -122.3418),
zoom: 13,
mapTypeId: 'roadmap',
disableDefaultUI: true
});
var infoWindow = new google.maps.InfoWindow;
// Change this depending on the name of your PHP file
downloadUrl("genxml3.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 + "<br />" + type;
var icon = customIcons[type] || {};
var marker = new google.maps.Marker({
map: map,
position: point,
icon: icon.icon,
shadow: icon.shadow
});
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: 900px; height: 750px;"></div>
<ul>
<a href="#">Restaurant</a>
</ul>
</body>
</html>
genxml3.php：
<?php
require("dbinfo.php");
// Start XML file, create parent node
$dom = new DOMDocument("1.0");
$node = $dom->createElement("map");
$parnode = $dom->appendChild($node);
// Opens a connection to a MySQL server
$connection=mysql_connect('localhost', $username, $password);
if (!$connection) { die('Not connected : ' . mysql_error());}
// Set the active MySQL database
$db_selected = mysql_select_db($database, $connection);
if (!$db_selected) {
die ('Can\'t use db : ' . mysql_error());
}
// Select all the rows in the markers table
// Checks for the 'GET' variable, if there isn't, run normal XML script,
// if there is, get the restriction/filter and query from the database
// with the filter
if (!empty($_GET)) {
$filter = $_GET['f'];
$query = "SELECT * FROM markers WHERE type = '$filter'";
} else {
$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();
?>
PHP 脚本生成以下 XML 代码：
<map>
<marker name="Pan Africa Market changed" address="1521 1st Ave, Seattle, WA" lat="47.6089" lng="-122.34" type="restaurant"/>
<marker name="Buddha Thai & Bar" address="2222 2nd Ave, Seattle, WA" lat="47.6136" lng="-122.344" type="bar"/>
<marker name="The Melting Pot" address="14 Mercer St, Seattle, WA" lat="47.6246" lng="-122.356" type="restaurant"/>
<marker name="Ipanema Grill" address="1225 1st Ave, Seattle, WA" lat="47.6064" lng="-122.338" type="restaurant"/>
<marker name="Sake House" address="2230 1st Ave, Seattle, WA" lat="47.6128" lng="-122.346" type="bar"/>
<marker name="Crab Pot" address="1301 Alaskan Way, Seattle, WA" lat="47.606" lng="-122.34" type="restaurant"/>
<marker name="Mama's Mexican Kitchen" address="2234 2nd Ave, Seattle, WA" lat="47.614" lng="-122.345" type="bar"/>
<marker name="Wingdome" address="1416 E Olive Way, Seattle, WA" lat="47.6172" lng="-122.327" type="bar"/>
<marker name="Piroshky Piroshky" address="1908 Pike pl, Seattle, WA" lat="47.6101" lng="-122.343" type="restaurant"/>
</map>
当我在导航栏中强制“获取”变量时（即：genxml3.php?f=restaurant），输出以下 XML 代码：
<map>
<marker name="Pan Africa Market changed" address="1521 1st Ave, Seattle, WA" lat="47.6089" lng="-122.34" type="restaurant"/>
<marker name="The Melting Pot" address="14 Mercer St, Seattle, WA" lat="47.6246" lng="-122.356" type="restaurant"/>
<marker name="Ipanema Grill" address="1225 1st Ave, Seattle, WA" lat="47.6064" lng="-122.338" type="restaurant"/>
<marker name="Crab Pot" address="1301 Alaskan Way, Seattle, WA" lat="47.606" lng="-122.34" type="restaurant"/>
<marker name="Piroshky Piroshky" address="1908 Pike pl, Seattle, WA" lat="47.6101" lng="-122.343" type="restaurant"/>
</map>
所以我知道 PHP 脚本中的逻辑是有效的，因为它过滤了所需的代码。因此，如果我输入“f=restaurant”，则仅显示“restaurant”类型的标记，如果我使用“f=bar”，则相同。
但是 JavaScript 仍然只使用第一个 XML 代码。如何让 JavaScript 代码使用第二个 XML 代码（应用了过滤器的那个）。
所以我现在正在寻找的是一种在按下 map.html 文件中的链接时使用新的 XML 代码运行 JavaScript 代码的方法？