javascript / php后退按钮

Question

I have this piece of code:

            if (file_exists($filedir)) {
            ?>
                <script>alert('File "<?php echo "$filename"; ?>" already exists.');</script>
            <?php
            echo <<<HERE
            <input action="action" type="button" value="Back" onclick="history.go(-1);" />
HERE;

So, how can i embed heredoc part of script into javascript alert box, in order to have alert message and back button in the same alert box ? I've tried to add:

header("Location:    ");

after the alert box, but that sends me back one page without the javascript alert message.

Thx for the help

Answer 1

Maybe javascript confirm() is what you want?

http://www.w3schools.com/jsref/met_win_confirm.asp

Answer 2

you can do something like this:

echo <<<HERE
<script>alert('File "$filename" already exists.<input action="action" type="button" value="Back" onclick="history.go(-1);" />')</script>
HERE;

but that wont show button, for that you have to use confirm or prompt javascript methods

Answer 3

得到它了：

alert('Go back'); window.location.href = "home.php";