How to keep input values when user goes to another page

Question

Well, I rode a form very simple to explain my problem.

<?php
$action = filter_input(INPUT_GET, 'action', FILTER_DEFAULT);

if ((!empty($action)) && ( $action === "add")) {
?>
    <script>
        alert('ERRO');
        window.history();
    </script>
    <?php
}
?>


<form action="form.php?action=add" method="post">
    <input type="text" name="nome">
    <input type="text" name="email">
    <input type="password" name="senha">
    <input type="submit" name="enviar" value="enviar" />
</form>

When there is an error in my form I send one alert for the user and it is redirected to the previous page to correct the error. The problem is that all form data is lost when it returns. Is there any way to resolve this? A way in which data is kept and only deleted when the form is correct?

Answer 1

Change window.history() for window.history.back() (equivalent to clicking the Back button of the browser), when you use the back button of the browser or even the function back browser itself recovers data from <form> (provided that the requisition has come from <form>)

<?php
$action = filter_input(INPUT_GET, 'action', FILTER_DEFAULT);

if ((!empty($action)) && ( $action === "add")) {
?>
    <script>
        alert('ERRO');
        window.history.back();
    </script>
    <?php
}
?>

<form action="form.php?action=add" method="post">
    <input type="text" name="nome">
    <input type="text" name="email">
    <input type="password" name="senha">
    <input type="submit" name="enviar" value="enviar" />
</form>

About the API history: https://developer.mozilla.org/en-US/docs/Web/API/History#Methods