好的，所以我有一个 PHP 脚本来处理文件上传，特别是 KML 文件，提取上传文件的中心点和位置，将这些详细信息保存在文本文件中，然后通过“标题”加载另一个页面。然后，此其他页面使用 AJAX 调用来设置从文本文件中收集的变量名称，用于 KML 文件的位置和中心点，以便调用 Google Maps API 在地图上显示 KML 层。
那是应该发生的事情，但什么都没有出现。我浏览我的 KML 文件，点击上传按钮，然后显示一个空白页面。当我检查我的服务器时，文件已上传，相关详细信息已写入各自的文本文件，因此当我尝试调用 Google Maps API 时显然出现了问题。
PHP上传和文件信息保存：
<?php
//Check that we have a file
if((!empty($_FILES["UploadedFile"])) && ($_FILES['UploadedFile']['error'] == 0)) {
//Check if the file is JPEG image and it's size is less than 3Mb
$filename = basename($_FILES['UploadedFile']['name']);
$ext = substr($filename, strrpos($filename, '.') + 1);
if (($ext == "kml") && ($_FILES["UploadedFile"]["size"] < 3145728)) {
//Determine the path to which we want to save this file
$newname = dirname(__FILE__).'/kml/'.$filename;
//Check if the file with the same name is already exists on the server
if (!file_exists($newname)) {
//Attempt to move the uploaded file to it's new place
if ((move_uploaded_file($_FILES['UploadedFile']['tmp_name'],$newname))) {
findCenter($newname);
saveName($newname);
} else {
echo "Error: A problem occurred during file upload!";
}
} else {
echo "Error: File ".$_FILES["UploadedFile"]["name"]." already exists";
}
} else {
echo "Error: Only .kml files under 3Mb are accepted for upload";
}
} else {
echo "Error: No file uploaded";
}
function findCenter($file) {
$kmlContent = file_get_contents($file);
$startName = "#sh_green-circle";
$endName = "#sh_red-circle";
$startCoords = getCoords($kmlContent, $startName);
$endCoords = getCoords($kmlContent, $endName);
$startLat = substr($startCoords, strrpos($startCoords, ',') +1);
$startLong = substr($startCoords, 0, strrpos($startCoords, ','));
$endLat = substr($endCoords, strrpos($endCoords, ',') +1);
$endLong = substr($endCoords, 0, strrpos($endCoords, ','));
$midLat = ($startLat+$endLat)/2;
$midLong = ($startLong+$endLong)/2;
$midCoord = "$midLat,$midLong";
$saveCenter = "kmlcenter.txt";
$fh = fopen($saveCenter, 'w') or die ("Can't create file");
$stringData = $midCoord;
fwrite($fh, $stringData);
fclose($fh);
}
function getCoords($kml, $name) {
$startSearch = strpos($kml, $name);
$midSearch = strpos($kml, "<coordinates>", $startSearch+1);
$endSearch = strpos($kml, "</coordinates>", $midSearch+1);
$longlat = substr($kml, $midSearch+13, $endSearch-($midSearch+13));
return $longlat;
}
function saveName($filename) {
$saveFile = "kmlfilename.txt";
$fh = fopen($saveFile, 'w') or die("Can't create file");
$stringData = "$filename";
fwrite($fh, $stringData);
fclose($fh);
header("Location: initgmaps.html");
}
?>
地图初始化：
<script type="text/javascript" src="https://maps.googleapis.com/maps/api/js?key=AIzaSyB8P7CzxiwQFf-RdK9QVRpH9se8AsMSsjEsensor=false"></script>
<script type="text/javascript">
function initialize() {
var kmlName = getName()
var kmlCoords = getCoords()
var mapcenter = new google.maps.LatLng(kmlCoords);
var myOptions = {
zoom: 11,
center: mapcenter,
mapTypeId: google.maps.MapTypeId.ROADMAP
}
var map = new google.maps.Map(document.getElementById("infoArea"), myOptions);
var kmlLayer = new google.maps.KmlLayer(kmlName);
kmlLayer.setMap(map);
}
</script>
相关AJAX函数：
<script language="javascript" type="text/javascript">
<!--
//Browser Support Code
function getName(){
var ajaxRequest; // The variable that makes Ajax possible!
var kmlName;
try{
// Opera 8.0+, Firefox, Safari
ajaxRequest = new XMLHttpRequest();
} catch (e){
// Internet Explorer Browsers
try{
ajaxRequest = new ActiveXObject("Msxml2.XMLHTTP");
} catch (e) {
try{
ajaxRequest = new ActiveXObject("Microsoft.XMLHTTP");
} catch (e){
// Something went wrong
alert("Your browser does not support AJAX.");
return false;
}
}
}
// Create a function that will receive data sent from the server
ajaxRequest.onreadystatechange = function(){
if(ajaxRequest.readyState == 4 && ajaxRequest.status == 200){
kmlName = ajaxRequest.responseText;
}
}
ajaxRequest.open("GET", "kmlfilename.txt", false);
ajaxRequest.send(null);
}
//-->
<script language="javascript" type="text/javascript">
<!--
//Browser Support Code
function getCoords(){
var ajaxRequest; // The variable that makes Ajax possible!
var kmlCoords;
try{
// Opera 8.0+, Firefox, Safari
ajaxRequest = new XMLHttpRequest();
} catch (e){
// Internet Explorer Browsers
try{
ajaxRequest = new ActiveXObject("Msxml2.XMLHTTP");
} catch (e) {
try{
ajaxRequest = new ActiveXObject("Microsoft.XMLHTTP");
} catch (e){
// Something went wrong
alert("Your browser does not support AJAX.");
return false;
}
}
}
// Create a function that will receive data sent from the server
ajaxRequest.onreadystatechange = function(){
if(ajaxRequest.readyState == 4 && ajaxRequest.status == 200){
kmlCoords = ajaxRequest.responseText;
}
}
ajaxRequest.open("GET", "kmlcenter.txt", false);
ajaxRequest.send(null);
}
//-->
当然，在 initgmaps.html 的正文中，我有：
onload="initialize()"
infoArea 是我的内联框架的 ID。
谁能看到为什么它不加载？我对网络开发完全陌生，边走边学，如果代码很糟糕，我很抱歉，我确信我犯了一些明显的错误。非常感谢。