Ajax-未收到请求

Question

I have a JavaScript function that I use to start a request. I need the GET parameter of this request, but trying to access it through PHP does not return anything. Any idea why? I call the JS function in the same PHP file through which I try to access it (index.php)

JavaScript:

function aufloesung() {
    var request = new XMLHttpRequest();
    request.open("GET", "index.php?screen=1", true);

    request.send();

}

PHP File:

<script> aufloesung(); </script>

...

echo $_GET["screen"]

But I don't get the parameter.

Answer 1

Its easy by using jQuery and slicing your index.php & ajaxphp files.

include jquery.js in your index.php:

<script src="//code.jquery.com/jquery-2.1.4.min.js"></script>
<script>
    aufloesung();
</script>

app.js:

function aufloesung() {

    $.ajax({ 
        type: "get", 
        url: "ajax.php?screen=1", 
        success: function( data ) {

            alert( data );

        }
    });

}

ajax.php:

<?PHP

    echo $_GET[ 'screen' ];

?>