AJAX variable are not reading from PHP file?

Question

This is my javascript that holds the function to save the file.

function saveMap()
{
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");
  }
  map = document.getElementById("sectorTableMap").innerHTML;
  data = '<table id="sectorTableMap">';
  data += map;
  data += '</table>';
  document.getElementById("sectorTableMap").innerHTML = data;
  //alert("done");
  //alert(data);


  if(fileName=="lastSave - RENAME") {
    return alert("Please set a file name under [CONFIG]");
  }
  else {
    //alert(data);
    //alert(user);
    //alert(fileName);
    xmlhttp.open("POST","http://pardustools.comuf.com/saveMap.php?t="+Math.random(),true);
    xmlhttp.send('map='+data+'&user='+user+'&fileName='+fileName);
    //alert(data);
    //alert(user);
    //alert(fileName);
  }
  xmlhttp.onreadystatechange=function()
  {
  if (xmlhttp.readyState==4 && xmlhttp.status==200)
    {
    //return alert("File has successfully been saved!");
    return alert(xmlhttp.responseText);
    }
  }
}

This is my files that is posted too.

<?php
$user = strtolower($_POST['user']);
$map = $_POST['map'];
$fileName = "savedMaps/".$user."/".$_POST['fileName'].".html";
file_put_contents($fileName,$map);
echo $fileName."<br />".$map;

?>

This is the output I receive on the php file.

savedMaps//.html

It should be more like this

savedMaps/randomName/fileName.html

EDIT:

To set for the user.

user = "<?php $cookie = $_COOKIE['mapperlogauth']; echo strtolower($cookie['user']);?>";

To set for the data... It is under the saveMap() function and starts with map.

You would have to show more of the javascript.. specifically where user is being initialised and given a value too — Pricey
– Pricey, Commented Jun 19, 2014 at 9:02
Why you use pure JS? Use jQuery, it make to do AJAX requests more simpler — hindmost
– hindmost, Commented Jun 19, 2014 at 9:06

user3036342 · Accepted Answer · 2014-06-19 09:19:05Z

1

You are using PHP's $_POST get, you're not posting any variables, you should use $_GET in your situation, or change your xmlhttp send to post properly. edit you are also missing the content type header to do a successful post

edit You should also be aware that there is a limit on how much you can send through using the technique you're using. (which is a get, not a post, even though you specify it)

I'd also recommend looking into jQuery for cross-browser compatibility and ease of use.

edit

Here's some code that will allow you to pick it up via POST:

xmlhttp.open("POST","ajax_test.asp",true);
xmlhttp.setRequestHeader("Content-type","application/x-www-form-urlencoded");
xmlhttp.send("fname=Henry&lname=Ford");

edited Jun 19, 2014 at 9:19

answered Jun 19, 2014 at 9:13

user3036342

1,0457 silver badges15 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Matthew Over a year ago

I now see what you mean now, I lacked my header... .-. Clumsy me.. By the way I hate you (Not really just jealous you solved it in probably minutes of looking while I been an hour debugging and stuff). But thanks a lot... Wanted to get this feature done before I went to sleep...

user3036342 Over a year ago

lol, no worries. I started with xmlhttp back in 2001, learned the hard way without any documentation. Literally took me weeks to figure out how to POST ;)

PixelsTech · Accepted Answer · 2014-06-19 09:10:00Z

0

Have you tried to use :

xmlhttp.send('map=dummy&user='+user+'&fileName='+fileName);

I doubt it may be caused by the encoding.

answered Jun 19, 2014 at 9:10

PixelsTech

3,3761 gold badge36 silver badges35 bronze badges

5 Comments

user3036342 Over a year ago

He isn't setting the xmlhttp correctly to do a post, so $_POST won't find any variables because it's actually in the $_GET

PixelsTech Over a year ago

@user3036342 He is setting the POST in xmlhttp.open("POST",...); right? You are saying this is wrong?

user3036342 Over a year ago

No it's not wrong, I edited my answer to reflect that he is also forgetting to set the content type to do a successful post, so even though he specifies POST, it will go through as a GET.

PixelsTech Over a year ago

@user3036342 I am also thinking that he should add the content type, but it's not compulsory.

Matthew Over a year ago

He was right.... I did a dummy test still didn't work... Now it works. It was the header.

Collectives™ on Stack Overflow

AJAX variable are not reading from PHP file?

2 Answers 2

2 Comments

5 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

2 Comments

5 Comments

Your Answer

Sign up or log in

Post as a guest

Related