How to Redirect to another php file using javascript

Question

Okay, so here's my code

<?php
$cn = new mysqli ("localhost", "root", "root", "dbsam");
$username = isset ($_POST['username']) ? $_POST['username']:"";
$password = isset ($_POST['password']) ? $_POST['password']:"";
$sql = "SELECT * FROM tbluser WHERE username=? AND password=?";
$upass = hash("SHA256", $password);
$qry = $cn->prepare($sql);
$qry->bind_param("ss", $username, $upass);
$qry->execute();
$qry->fetch();
if ($qry->num_rows()==1) {
    echo "Logged in!";
}
else {
    echo "<script>alert('Account did not match the database records!')</script>>";
    header ("location: login.php");
}
?>

If the username and password did not match, an alert box will appear. So the problem is that it doesn't appear anymore it only executes the header that I put under it but if I remove the header, the alert dialog box will appear. I want the alert box to appear then the user will be redirected to the log-in page after that. How can I do that? Great Thanks!

You'll need to use Javascript to do the redirect if you want the alert to appear, see something like this: stackoverflow.com/a/506004/7956549 — stevenkellow
– stevenkellow, Commented Jul 6, 2017 at 14:40
Might be better to show a content block (div) for a few seconds, such as a flash message, then after a few seconds redirect the user. — Adam
– Adam, Commented Jul 6, 2017 at 14:40
It may be best to set this script as a separate ajax call and return a well-structured JSON response. Then handle the response in JS. — Rob W
– Rob W, Commented Jul 6, 2017 at 14:41

Carlo · Accepted Answer · 2017-07-06 14:41:15Z

2

You can set document.location, inside a script tag. Something like

<script> document.location = 'login.php'; </script>

Beside the answer to the direct question, I feel like you will need a timeout, or something more complex to handle the time spent reading the alert.

answered Jul 6, 2017 at 14:41

Carlo

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Comments

Seif.ben · Accepted Answer · 2018-01-10 15:03:07Z

1

It is impossible in such way, PHP will redirect and never let the browwer executing the JS.

You can add a variable in the url then make your test in login.php then show the alert

    .....
    else {
        header ("location: login.php?mode=login_failed");
    }

    //login.php
    $mode = filter_input(INPUT_GET, 'mode');
    if ($mode === 'login_failed') {
         echo '<script>.......';
    }

edited Jan 10, 2018 at 15:03

answered Jul 6, 2017 at 14:46

Seif.ben

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