I've looked through every answer i can find on here and can't solve this. I'm pretty sure I havn't missed anything obvious.
I'm trying to load map markers based on lat longs. The problem is when I try to return the AJAX response as responseXML its always null, if i use responseText it works fine but obviously the next step doesn't work.
This is the PHP that generates the XML:
<?php
header('Content-type: text/xml');
?>
<?xml version="1.0" encoding="ISO-8859-1"?>
<properties>
<![CDATA[
<?php
if ($body != null):
foreach ($body as $property): ?>
<property>
<lat><?php echo $property -> lat; ?></lat>
<long><?php echo $property -> long; ?></long>
<name><?php echo $property -> property_name; ?></name>
</property>
<?php endforeach;
endif; ?>
]]>
</properties>
I can see in Fiddler that the request is made ok
GET /letsgo/index.php/hotmaps/get_properties_ajax/22.270888501350186/22.288560098193066/114.13720860290528/114.19827713775635 HTTP/1.1
Entity Content-type: text/xml
Although when i view this in XML view in fiddler it appears to be empty,
here is the raw response
HTTP/1.1 200 OK
Date: Tue, 15 Jan 2013 11:04:27 GMT
Server: Apache/2.4.2 (Win32) PHP/5.4.4
X-Powered-By: PHP/5.4.4
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Pragma: no-cache
Content-Length: 310
Keep-Alive: timeout=5, max=100
Connection: Keep-Alive
Content-Type: text/xml
<?xml version="1.0" encoding="ISO-8859-1"?>
<properties>
<![CDATA[
<property>
<lat>22.2776</lat>
<long>114.173</long>
<name>Kaxo Tower test</name>
</property>
<property>
<lat>22.2803</lat>
<long>114.16</long>
<name>Kuno Tower</name>
</property>
]]>
</properties>
Here is the create marker function that is called every time the map is moved
// make the ajax request
function loadXMLDoc(downUrl){
var xmlhttp;
if (window.XMLHttpRequest) {
// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
}
else {// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function() {
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{
//var propertiesXml = xmlhttp.responseText; // WORKS FINE!!
var propertiesXml = xmlhttp.responseXML; // ALWAYS null
//alert(propertiesXml);
var propertiesRows = propertiesXml.getElementsByTagName("property");
for (var i = 0; i < propertiesRows.length; i++) {
var propertiesRow = propertiesRows[i];
var xmlLat = propertiesRow.getElementsByTagName("lat")[0];
var xmlLong = propertiesRow.getElementsByTagName("long")[0];
var propertyLatLong = new google.maps.LatLng(parseFloat(xmlLat.firstChild.data),parseFloat(xmlLat.firstChild.data));
// create each marker
createMarker(propertyLatLong);
}
}
}
xmlhttp.open("GET", downUrl, false); // false or true? makes no difference
xmlhttp.setRequestHeader("Content-type", "text/xml");
xmlhttp.send();
}
and this is the error i get for feeding getElementsByTagName with null, Chrome console says
Uncaught TypeError: Cannot call method 'getElementsByTagName' of null
This is running on my local Apache
Any suggestions?
/** UPDATE - WORKING CODE **/
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
<style type="text/css">
html { height: 100% }
body { height: 100%; margin: 0; padding: 0 }
#map_canvas { height: 100% }
</style>
<script type="text/javascript" src=";sensor=false">
</script>
<script type="text/javascript">
// initialise map
function initialize() {
// set starting latlong
var myLatlng = new google.maps.LatLng(22.2776, 114.173);
// set initial map options
var mapOptions = {
center: myLatlng,
zoom: 13,
mapTypeId: google.maps.MapTypeId.ROADMAP
};
// create the map
var map = new google.maps.Map(document.getElementById("map_canvas"), mapOptions);
// listen for changes in map bounds - after map has stopped moving!!
google.maps.event.addListener(map,'idle', function () {
loadByBounds(map);
});
}
// if the bounds have changed
function loadByBounds(map) {
var bounds = map.getBounds();
var swPoint = bounds.getSouthWest();
var nePoint = bounds.getNorthEast();
// specific co ordinates
var swLat = swPoint.lat();
var swLng = swPoint.lng();
var neLat = nePoint.lat();
var neLng = nePoint.lng();
var downUrl = "<?php echo site_url('hotmaps/get_properties_ajax'); ?>/"+swLat+"/"+neLat+"/"+swLng+"/"+neLng;
// load the
loadXMLDoc(downUrl, map);
// clear icons outside of bounding box
//....
}
// make the ajax request
function loadXMLDoc(downUrl, map){
var xmlhttp;
if (window.XMLHttpRequest) {
// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
}
else {// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function() {
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{
var propertiesXml = xmlhttp.responseText; // WORKS FINE!!
// remove whitespaces from start and end (.trim() doesnt work)
propertiesXml = propertiesXml.replace(/^\s+|\s+$/g,'');
// manually parse to XML DOM object
var parser = new DOMParser();
var xmlDoc;
try {
xmlDoc = parser.parseFromString (propertiesXml, "text/xml");
} catch (e) {
alert ("XML parsing error.");
return false;
};
//console.log(xmlDoc);
// get each property
var propertiesRows = xmlDoc.getElementsByTagName("property");
//alert(console.log(propertiesRows));
for (var i = 0; i < propertiesRows.length; i++) {
var propertiesRow = propertiesRows[i];
var xmlLat = propertiesRow.getElementsByTagName("lat")[0];
var xmlLong = propertiesRow.getElementsByTagName("long")[0];
var propertyLatLong = new google.maps.LatLng(parseFloat(xmlLat.firstChild.data),parseFloat(xmlLong.firstChild.data));
// create each marker
createMarker(propertyLatLong, map);
}
}
}
xmlhttp.open("GET", downUrl, false);
xmlhttp.setRequestHeader("Content-type", "text/xml");
xmlhttp.send();
}
// create new markers
function createMarker(propertyLatLong, map){
var dynamicMarker = new google.maps.Marker({
map:map,
draggable:false,
position: propertyLatLong
});
debugger;
}
</script>
</head>
<body onload="initialize()">
<div id="map_canvas" style="width:100%; height:100%"></div>
</body>
</html>
I've looked through every answer i can find on here and can't solve this. I'm pretty sure I havn't missed anything obvious.
I'm trying to load map markers based on lat longs. The problem is when I try to return the AJAX response as responseXML its always null, if i use responseText it works fine but obviously the next step doesn't work.
This is the PHP that generates the XML:
<?php
header('Content-type: text/xml');
?>
<?xml version="1.0" encoding="ISO-8859-1"?>
<properties>
<![CDATA[
<?php
if ($body != null):
foreach ($body as $property): ?>
<property>
<lat><?php echo $property -> lat; ?></lat>
<long><?php echo $property -> long; ?></long>
<name><?php echo $property -> property_name; ?></name>
</property>
<?php endforeach;
endif; ?>
]]>
</properties>
I can see in Fiddler that the request is made ok
GET /letsgo/index.php/hotmaps/get_properties_ajax/22.270888501350186/22.288560098193066/114.13720860290528/114.19827713775635 HTTP/1.1
Entity Content-type: text/xml
Although when i view this in XML view in fiddler it appears to be empty,
here is the raw response
HTTP/1.1 200 OK
Date: Tue, 15 Jan 2013 11:04:27 GMT
Server: Apache/2.4.2 (Win32) PHP/5.4.4
X-Powered-By: PHP/5.4.4
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Pragma: no-cache
Content-Length: 310
Keep-Alive: timeout=5, max=100
Connection: Keep-Alive
Content-Type: text/xml
<?xml version="1.0" encoding="ISO-8859-1"?>
<properties>
<![CDATA[
<property>
<lat>22.2776</lat>
<long>114.173</long>
<name>Kaxo Tower test</name>
</property>
<property>
<lat>22.2803</lat>
<long>114.16</long>
<name>Kuno Tower</name>
</property>
]]>
</properties>
Here is the create marker function that is called every time the map is moved
// make the ajax request
function loadXMLDoc(downUrl){
var xmlhttp;
if (window.XMLHttpRequest) {
// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
}
else {// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function() {
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{
//var propertiesXml = xmlhttp.responseText; // WORKS FINE!!
var propertiesXml = xmlhttp.responseXML; // ALWAYS null
//alert(propertiesXml);
var propertiesRows = propertiesXml.getElementsByTagName("property");
for (var i = 0; i < propertiesRows.length; i++) {
var propertiesRow = propertiesRows[i];
var xmlLat = propertiesRow.getElementsByTagName("lat")[0];
var xmlLong = propertiesRow.getElementsByTagName("long")[0];
var propertyLatLong = new google.maps.LatLng(parseFloat(xmlLat.firstChild.data),parseFloat(xmlLat.firstChild.data));
// create each marker
createMarker(propertyLatLong);
}
}
}
xmlhttp.open("GET", downUrl, false); // false or true? makes no difference
xmlhttp.setRequestHeader("Content-type", "text/xml");
xmlhttp.send();
}
and this is the error i get for feeding getElementsByTagName with null, Chrome console says
Uncaught TypeError: Cannot call method 'getElementsByTagName' of null
This is running on my local Apache
Any suggestions?
/** UPDATE - WORKING CODE **/
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
<style type="text/css">
html { height: 100% }
body { height: 100%; margin: 0; padding: 0 }
#map_canvas { height: 100% }
</style>
<script type="text/javascript" src="https://maps.googleapis./maps/api/js?key=APIKEYHERE&sensor=false">
</script>
<script type="text/javascript">
// initialise map
function initialize() {
// set starting latlong
var myLatlng = new google.maps.LatLng(22.2776, 114.173);
// set initial map options
var mapOptions = {
center: myLatlng,
zoom: 13,
mapTypeId: google.maps.MapTypeId.ROADMAP
};
// create the map
var map = new google.maps.Map(document.getElementById("map_canvas"), mapOptions);
// listen for changes in map bounds - after map has stopped moving!!
google.maps.event.addListener(map,'idle', function () {
loadByBounds(map);
});
}
// if the bounds have changed
function loadByBounds(map) {
var bounds = map.getBounds();
var swPoint = bounds.getSouthWest();
var nePoint = bounds.getNorthEast();
// specific co ordinates
var swLat = swPoint.lat();
var swLng = swPoint.lng();
var neLat = nePoint.lat();
var neLng = nePoint.lng();
var downUrl = "<?php echo site_url('hotmaps/get_properties_ajax'); ?>/"+swLat+"/"+neLat+"/"+swLng+"/"+neLng;
// load the
loadXMLDoc(downUrl, map);
// clear icons outside of bounding box
//....
}
// make the ajax request
function loadXMLDoc(downUrl, map){
var xmlhttp;
if (window.XMLHttpRequest) {
// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
}
else {// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function() {
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{
var propertiesXml = xmlhttp.responseText; // WORKS FINE!!
// remove whitespaces from start and end (.trim() doesnt work)
propertiesXml = propertiesXml.replace(/^\s+|\s+$/g,'');
// manually parse to XML DOM object
var parser = new DOMParser();
var xmlDoc;
try {
xmlDoc = parser.parseFromString (propertiesXml, "text/xml");
} catch (e) {
alert ("XML parsing error.");
return false;
};
//console.log(xmlDoc);
// get each property
var propertiesRows = xmlDoc.getElementsByTagName("property");
//alert(console.log(propertiesRows));
for (var i = 0; i < propertiesRows.length; i++) {
var propertiesRow = propertiesRows[i];
var xmlLat = propertiesRow.getElementsByTagName("lat")[0];
var xmlLong = propertiesRow.getElementsByTagName("long")[0];
var propertyLatLong = new google.maps.LatLng(parseFloat(xmlLat.firstChild.data),parseFloat(xmlLong.firstChild.data));
// create each marker
createMarker(propertyLatLong, map);
}
}
}
xmlhttp.open("GET", downUrl, false);
xmlhttp.setRequestHeader("Content-type", "text/xml");
xmlhttp.send();
}
// create new markers
function createMarker(propertyLatLong, map){
var dynamicMarker = new google.maps.Marker({
map:map,
draggable:false,
position: propertyLatLong
});
debugger;
}
</script>
</head>
<body onload="initialize()">
<div id="map_canvas" style="width:100%; height:100%"></div>
</body>
</html>
3 Answers
Reset to default 7You can try parsing XML yourself:
var parser = new DOMParser();
var xmlDoc = parser.parseFromString(xmlhttp.responseText, "application/xml");
Like this.
your tags are in CDATA section so they are ignore as tag by the parser.
I wonder why you want the parser to skip almost your entire http response body, it seems there is no need, it's not containing anything that could be misinterpreted. It even is the data you want to get parsed, that you hideaway in your example for no apparent reason.
Look here for some explanation of CDATA: http://www.w3schools./xml/xml_cdata.asp
You could try menting out the opening and closing CDATA statement like mentioned here: http://de.selfhtml/html/xhtml/unterschiede.htm
They also state, that the XML parser assumes UTF-8 encoding by default and will refuse parsing if not configured correctly, and that overwriting the exspected type via the response header is not remended.
I prefer to avoid opening and closing php blocks inside block-statements the way you did it, but I'm not quite up-to-date with the latest coding conventions, so I may be wrong on that one.
<?php
header('Content-type: text/xml');
header ('Cache-Control: no-cache');
header ('Cache-Control: no-store' , false);
$response ='<?xml version="1.0" encoding="UTF-8"?>
<properties>';
if ($body != null):
foreach ($body as $property):
$response .='<property>
<lat>'.$property->lat.'</lat>
<long>'.$property->long'.</long>
<name>'.$property->property_name.'</name>
</property>';
endforeach;
endif;
$response .='</properties>';
echo responseText;
?>