How to send the form without redirecting to another PHP page

Question

How to send the form behind without redirecting to another page just clear the fields and display an alert or message that was sent, without refreshing the page, because I did so :

echo ("<SCRIPT LANGUAGE='JavaScript'>window.location.href='index.php';window.alert('Formulário enviado com sucesso!');</SCRIPT>");

But it still has a delay that shows the application running and then shows the alert and finally loads the page.

Answer 1

Hello you can do with Ajax, thus:

    $.ajax({
        // URL de destino
        url: 'index.php',
        type: 'post',
        // Suas variaveis serializadas EX: 'nome=Bruno&idade=24'
        data: dataString,
        cache: false,

        success: function (data)
        {
            // retorno do php
            alert('Formulário enviado com sucesso!');
        }
    });

Answer 2

To change the behavior of Submit. Take a look at Prevent Default. You disable Submit’s behavior from reloading the screen, and in function do what you have to do (Alert, clear fields, etc)

https://developer.mozilla.org/en-US/docs/Web/API/Event/preventDefault