access XMLHttpRequests send(data) in PHP backend

Question

I have an XMLHttpRequest sending data to a PHP backend.

var req = new XMLHttpRequest();
req.open('GET', url);

req.onload = function() {
  // This is called even on 404 etc
  // so check the status
  if (req.status == 200) {
    // Resolve the promise with the response text
    resolve(req.response);
  }
  else {
    // Otherwise reject with the status text
    // which will hopefully be a meaningful error
    reject(Error(req.statusText));
  }
};

// Handle network errors
req.onerror = function() {
  reject(Error("Network Error"));
};

// Make the request
req.send('query=messages'); // <-- i want to access this in php

i tried print_r($_GET) and print_r($_REQUEST) but neither works.

anyone knows how to access this data?

Have you watched the request / response in the browser's console? — Jay Blanchard
– Jay Blanchard, Commented Jan 15, 2016 at 13:44
yes @JayBlanchard it doesn't seem to deliver query=message at all: GET /rest/api.php HTTP/1.1 Host: localhost Connection: keep-alive Origin: localhost:8000 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/47.0.2526.111 Safari/537.36 Accept: / Referer: localhost:8000/index.html Accept-Encoding: gzip, deflate, sdch Accept-Language: de-DE,de;q=0.8,en-US;q=0.6,en;q=0.4 — philx_x
– philx_x, Commented Jan 15, 2016 at 13:58
@MagnusEriksson Yes thanks a lot! i answered the comment before i read your answer — philx_x
– philx_x, Commented Jan 15, 2016 at 14:04

M. Eriksson · Accepted Answer · 2016-01-15 13:54:46Z

2

You can only send data through the XMLHttpRequest.send()-method for POST-requests, not GET.

For GET-requests, you need to append the data to the url as query string.

url += "?query=message";

Then you can retrieve the data with PHP using:

$message = $_GET['query'];

More info: http://www.w3schools.com/ajax/ajax_xmlhttprequest_send.asp

answered Jan 15, 2016 at 13:54

M. Eriksson

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2 Comments

philx_x Over a year ago

aaah okay, i didn't know. using XMLHttpRequest to call a PHP REST API seems a bit unconvenient then since i have to use URL for GET and send() for POST. is there a better aproach to this in vanilla js?

M. Eriksson Over a year ago

Not really. I would make a small wrapper for it and use it like: ajax.get(url, data, callback); and ajax.post(url, data, callback) and handle the request in those methods.

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