Java Script PHP XML downloadUrl

Question

下面的java腳本正在從PHP下載XML（請參閱第二個XML片段），但是當它完成後，downloadUrl將顯示XML數據（而不是帶有標記的谷歌地圖）數據流。在屏幕更改之前，我可以在地圖上看到標記，所以我很確定PHP中的XML正確地發送到了Java腳本，我只是不確定爲什麼PHP本身在病房之後運行。

function load() { 

      var infoWindow = new google.maps.InfoWindow; 
      initMap(); 

      // Change this depending on the name of your PHP file 
      downloadUrl("gpsx.php", function(data) { 
      var xml = data.responseXML; 
      var markers = xml.documentElement.getElementsByTagName("marker"); 
      for (var i = 0; i < markers.length; i++) { 
       var keyid = markers[i].getAttribute("keyid"); 
       console.log(keyid); 
       var deviceid = markers[i].getAttribute("deviceid"); 
       var accessid = markers[i].getAttribute("accessid"); 
       var datex = markers[i].getAttribute("date"); 
       var timex = markers[i].getAttribute("time"); 
       var point = new google.maps.LatLng(
        parseFloat(markers[i].getAttribute("lng")), 
        parseFloat(markers[i].getAttribute("lat"))); 
       var sats = markers[i].getAttribute("sats"); 
       var speedm = markers[i].getAttribute("speedm"); 
       var histon = markers[i].getAttribute("histon"); 
       var histstart = markers[i].getAttribute("histstart"); 
       var histon = markers[i].getAttribute("hist_many"); 
       var html = "<b>" + datex + "</b> <br/>" + timex; 
       var dtstr = "Satellites " + sats + " Speed " + speedm + " D/T: " + datex + " " + timex; 
       var image = "http://chart.apis.google.com/chart?chst=d_map_pin_letter&chld=" + i + "|FF0000|000000"; 
       var marker = new google.maps.Marker({map: map,position: point,title: dtstr,icon: image }); 
       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() {} 

function initMap() { 
    map = new google.maps.Map(document.getElementById('map'), { 
    center: {lat: 39.833, lng: -98.585}, 
    zoom: 12 
    }); 
    } 

---

<?php 
// session_start(); 
$dom = new DOMDocument("1.0","UTF-8"); 
$node = $dom->createElement("markers"); 
$parnode = $dom->appendChild($node); 

$servername ="localhost"; 
$username = "username"; 
$password = "password"; 
$dbname = "gps"; 

$dev = $_SESSION["devid"]; 
$conn = mysqli_connect($servername, $username, $password, $dbname); 
// Check connection 
if ($conn->connect_error) { 
    die("Connection failed: " . $conn->connect_error); 
$sql = "SELECT keyID , deviceID, accessID, lng, lat, date, time, pstn,sats,speedmph FROM hist_data WHERE deviceID='" . $dev . "' ORDER BY ABS(pstn);"; 
$result = mysqli_query($conn,$sql); 
$nums = mysqli_num_rows($result); 

if ($nums > 0) { 
    header("Content-type: text/xml"); 
    while($row = mysqli_fetch_array($result)) { 
     $node = $dom->createElement("marker"); 
     $newnode = $parnode->appendChild($node); 
     $newnode->setAttribute("keyid", $row['keyID']); 
     $newnode->setAttribute("deviceid",$row['deviceID']); 
     $newnode->setAttribute("accessid",$row['accessID']); 
     $newnode->setAttribute("lng",$row['lng']); 
     $newnode->setAttribute("lat",$row['lat']); 
     $newnode->setAttribute("date",$row['date']); 
     $newnode->setAttribute("time",$row['time']); 
     $newnode->setAttribute("sats",$row['sats']); 
     $newnode->setAttribute("speedm",$row['speedmph']); 
     $newnode->setAttribute("histon",$hist_on); 
     $newnode->setAttribute("histstart",$hist_start); 
     $newnode->setAttribute("histmany",$hist_many); 
    } 
} else { 
    echo "0 results"; 
} 
echo $dom->saveXML(); 
?> 

---

<markers> 
<marker keyid="94454" deviceid="1e002c001547353236343033" accessid="1fa33427cd2b9f8beb75b6e156e545d5b20e33e7" lng="29.635313" lat="-95.773415" date="2016-08-15" time="02:02:05.722Z" sats=" 0.000000" speedm=" 0.552374" histon="Y" histstart="20" histmany="9"/> 
<marker keyid="3339" deviceid="1e002c001547353236343033" accessid="1fa33427cd2b9f8beb75b6e156e545d5b20e33e7" lng="29.635300" lat="-95.773338" date="2016-08-15" time="02:17:05.644Z" sats=" 0.000000" speedm=" 0.621421" histon="Y" histstart="20" histmany="9"/> 
<marker keyid="2552" deviceid="1e002c001547353236343033" accessid="1fa33427cd2b9f8beb75b6e156e545d5b20e33e7" lng="29.635216" lat="-95.773270" date="2016-08-15" time="02:32:05.787Z" sats=" 0.000000" speedm=" 0.448804" histon="Y" histstart="20" histmany="9"/> 
<marker keyid="95112" deviceid="1e002c001547353236343033" accessid="1fa33427cd2b9f8beb75b6e156e545d5b20e33e7" lng="29.635225" lat="-95.773315" date="2016-08-15" time="02:47:05.711Z" sats=" 0.000000" speedm=" 0.218648" histon="Y" histstart="20" histmany="9"/> 
<marker keyid="32275" deviceid="1e002c001547353236343033" accessid="1fa33427cd2b9f8beb75b6e156e545d5b20e33e7" lng="29.635281" lat="-95.773399" date="2016-08-15" time="03:02:05.735Z" sats=" 0.000000" speedm=" 0.782530" histon="Y" histstart="20" histmany="9"/> 
<marker keyid="41199" deviceid="1e002c001547353236343033" accessid="1fa33427cd2b9f8beb75b6e156e545d5b20e33e7" lng="29.635210" lat="-95.773216" date="2016-08-15" time="03:17:05.763Z" sats=" 0.000000" speedm=" 0.517851" histon="Y" histstart="20" histmany="9"/> 
<marker keyid="33761" deviceid="1e002c001547353236343033" accessid="1fa33427cd2b9f8beb75b6e156e545d5b20e33e7" lng="29.635267" lat="-95.773315" date="2016-08-15" time="03:32:05.780Z" sats=" 0.000000" speedm=" 0.368249" histon="Y" histstart="20" histmany="9"/> 
</markers> 

Answer 1

？>從PHP代碼中缺少。我首先添加了exit（）來修復它，但隨着我看上去更接近一些，我發現了我的方式錯誤！