How to Pass Along Variables with Xmlhttprequest

How do I pass along variables with XMLHTTPRequest

If you want to pass variables to the server using GET that would be the way yes. Remember to escape (urlencode) them properly!

It is also possible to use POST, if you dont want your variables to be visible.

A complete sample would be:

var url = "bla.php";
var params = "somevariable=somevalue&anothervariable=anothervalue";
var http = new XMLHttpRequest();

http.open("GET", url+"?"+params, true);
http.onreadystatechange = function()
{
    if(http.readyState == 4 && http.status == 200) {
        alert(http.responseText);
    }
}
http.send(null);

To test this, (using PHP) you could var_dump $_GET to see what you retrieve.

XMLHttpRequest GET params undefined in request nodejs api

As mentioned, GET or HEAD requests cannot have a body.
If your data is large, you should move to a POST request.

However, if the parameters you want to use are short like the ones in the example, you should use query strings:

var url = "bla.php";
var params = "somevariable=somevalue&anothervariable=anothervalue";
var http = new XMLHttpRequest();

http.open("GET", url+"?"+params, true);
http.send(null);

on the node side, assuming you use express, you can read the variables using:

var somevariable = req.query.somevariable;
var anothervariable = req.query.anothervariable;

Passing variable into xmlHTTPRequest as a URL parameter

You have extra double quotes " in following line :

ajax.open("GET", "'mexx.php?market='+market", true);
_________________^_________________________^

Should be :

ajax.open("GET", 'mexx.php?market='+market, true);

Also put double qoutes " arround :

market = <?php echo $market; ?>;

Should be :

market = "<?php echo $market; ?>";
_________^______________________^

Hope this helps.

Passing multiple parameters by POST using XMLHttpRequest and HTML

The data variable you are using needs to be a JSON object. In your example here it is a string, so the individual values are not passed, just one single string.

Try:

var data = `{"ssid": "${network}", "psk": "${presharedkey}"}`;

passing a javascript variable to PHP with xmlhttprequest

Instead of

 print_r($test);

use the echo

 echo $test;

As $test is not an array is a string value. print_r is used to print the array. that's why is given the null value.

And your send function in ajax should be like this:

hr.send("value="+value);

In the send function, the parameter that passed must be a string like this:

"name=value&anothername="+encodeURIComponent(myVar)+"&so=on"

More tutorial is here.

Passing more then one value with XMLHttpRequest?

Add & to your url when you pass another variable.

You also forgot a +.

Change :

xmlhttp.open("GET","adminfunction.php?status="+status"id="+id,false);

To :

xmlhttp.open("GET","adminfunction.php?status="+status+"&id="+id,false);

Is there a way to get params from a XMLHttpRequest response?

As Bergi said it's not possible to retrieve the parameters that were sent with the request on the response. So I'm closing the question.

Thanks to everyone who helped!

How to store $_SESSION variables in Javascript for XMLHttpRequest purposes?

You don't have to use javascript to share information between PHP files (even if on separate servers).

$_SESSION is used explicitly to keep data between pages and you should handle it within them as such.

If you have to send user_id to a file on a different server, it's advised to do it inside of your PHP files and not Javascript (which is clientside and thus very prone to be abused).

You could simply use curl to perform a HTTP POST request.

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