Pass PHP ID for javascript to a page

Question

I would like to send the id I pick up with php and send to a page every 30 seconds...what I’ve done so far:

$idtarefa = $_GET['id'];

get the id, do all the html and ai in javascript I did it:

<script type="text/javascript">
    var ajax = new XMLHttpRequest();
    ajax.onreadystatechange = function() {
        if (ajax.readyState === 4) {
            if (ajax.status === 200) {

                // Tudo correu bem NA REQUISIÇÃO!

            } else {
                // debug:
                console.log(ajax);
                alert('Erro na requisição.');
            }
        }
    }

    setInterval(function() {
        ajax.open('get', 'atualiza_base2.php?id=<?php echo $idtarefa ?>');
        ajax.send();
    }, 3000);
</script>

The idea is to update the time every 30 seconds according to the id in a mysql table, I looked at several scripts and went there, but surely there is something wrong that I do not know what is...in the file update_base I wanted to get the id with get dnv

Answer 1

Here’s what you can do. Before including or writing javascript code, set a constant with your id, example:

<script>
    const idTarefa = <?php echo $idTarefa ?>;
</script>

And your setInterval will look like this:

setInterval(function() {
    ajax.open('get', 'atualiza_base2.php?id='+idTarefa);
    ajax.send();
}, 3000);

To get the id again, just do $id = $_GET['id'];

If you haven’t solved your question, give more details about the file update_base.php