如何清除表单数据以便刷新不会在没有转发的情况下重复数据？ [英] How to clear form data so refresh doesn't duplicate data without forwarding?

问题描述

我创建了一个留言簿，用户可以通过HTML表单添加条目。将数据提交到留言簿后，一些用户刷新页面。我知道的所有浏览器都会重新提交数据。之后。有没有办法告诉浏览器，数据不应该重新提交？

I created a guestbook, in which users can add entries via an HTML form. After submitting data to the guestbook, some users refresh the page. All browsers I know resubmit the data. afterwards. Is there a way to tell the browser, that the data should not be resubmitted?

我以前有成功将数据存入数据库之后的重定向。但是，现在我想向用户提供一些附加信息，例如感谢您的参赛作品......。或者参赛作品中的一小部分已发送到您的电子邮件地址......。我真的很喜欢避免将所有值添加到GET参数以便能够在转发后使用这些信息。

I used to have a redirect after sucessfully storig the data to the database. But, now I want to promt some additional information to the user, e.g. "Thanks for your entry entitled '...'.", or "A coy of the entry was sent to your e-Mail-Adress...". I really like to avoid adding all the values to GET-Parameters to be able to use the information after the forwarding.

是否有另一种方式（没有前进！）到prevnt浏览器在用户点击刷新按钮后再次提交数据？

Is there another way (without a forward!) to prevnt the browser from submitting the data again after the user click on the "refresh" button?

推荐答案

也许你可以设置会话使用发布数据的哈希变量，并在每次加载页面时检查它。如果哈希值相同，则数据已经提交：

Maybe you could set a session variable with a hash of the data posted and check it each time the page is loaded. If the hash is the same, the data has already been submitted:

<?php
session_start(); //Start the session

$dataHash = md5($_POST['name'].$_POST['comment'].$_POST['whatever']); //Get a hash of the submitted data

if(isset($_SESSION['gbHash']) && $_SESSION['gbHash'] == $dataHash) { //Check if the data has been submitted before
    //Do not save the data/show a warning message
} else {
    //Save the data/show a thank you message
}


$_SESSION['gbHash'] = $dataHash;
?>

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