PHP not getting xmlhttprequest post

Question

I've been at this for hours and have yet to find a solution. Chrome's network activity shows that the post is being sent and the payload is "id=a1" but the php always returns an empty string. Either this is some silly typo that I've missed for the longest time, or my server host php.ini is blocking it. I contemplated the later, but I've used plenty of post scripts previously on this host without issue.

I've tried every combination I could think of with no avail :(

What could be causing this?

relevant .js:

var xhr;
if (window.XMLHttpRequest) {
  xhr = new XMLHttpRequest();
} else if (window.ActiveXObject) {
  xhr = new ActiveXObject("Microsoft.XMLHTTP");
}

xhr.open("POST", "api.php", true);
xhr.setRequestHeader("Content-Type", "application/x-www/form-urlencoded");
xhr.send("id=" + "a1");
xhr.onreadystatechange = display_data;

function display_data() {
  if (xhr.readyState == 4 && xhr.status == 200) {
    alert(xhr.responseText);
  }

}

relevant .php:

$id = $_POST['id'];
echo $id;

Make xhr.send("id=" + "a1"); your last line of code and try again — Ben
– Ben, Commented Jan 3, 2016 at 5:00
You made a typo in the request header string. You had application/x-www/form-urlencoded, you need application/x-www-form-urlencoded. Making this change alters the output from an error message mentioning an undefined index, 'id', to a1 — enhzflep
– enhzflep, Commented Jan 3, 2016 at 5:17

Kit · Accepted Answer · 2016-01-03 05:18:15Z

1

Try this...

Edited. Missed a semicolon.

var xhr;
if (window.XMLHttpRequest) {
  xhr = new XMLHttpRequest();
} else if (window.ActiveXObject) {
  xhr = new ActiveXObject("Microsoft.XMLHTTP");
}

xhr.open("POST", "api.php", true);
xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
xhr.send("id=" + "a1");
xhr.onreadystatechange = function() {
  if (xhr.readyState == 4 && xhr.status == 200) {
    alert(xhr.responseText);
  }

};

edited Jan 3, 2016 at 5:18

answered Jan 3, 2016 at 5:12

Kit

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1 Comment

enhzflep Over a year ago

You don't need semi-colons after the end of a block. You've merely placed one after the closing brace for the handler for the onreadystatechange event. The error message remains the same as the one generated by the code in the question. ;) - The only reason your code now works, is that you've altered the request-header string in an edit.

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