31

10-2012

当提交一个HTML表单,如果数据量比较大它可能需要几秒钟前成功提交,并显示响应页面的形式。人们可以得到空闲,并单击提交按钮几次,这可能会导致重复的表单提交。通常并不真的是一个问题,但在某些情况下,你可能要防止这种情况的发生。
下面你会发现两个简单的技巧,以防止重复提交,您可以使用这些或两者的结合。

1防止多个表单提交使用Javascript
使用Javascript块重复提交可能是最简单的方法。当有人提交表单我们简单地禁用Submit按钮,可能改变它的值为更具描述性的东西,比如“提交,请稍候……”
试着点击这个按钮,例如。它仍将禁用,直到你重新加载此页面:
第一步是要给你的提交按钮一个惟一的id,例如id =“myButton“:
<input type=”submit” value=”Submit” id=”myButton” />
第二个(也是最后一次)的步骤是给两个Javascript命令<form>标记。第一个将告诉浏览器禁用submit按钮的表单被提交之后,第二个将更改按钮的文本来给用户一些知道发生了什么。这是代码添加到你的表单标记:
onsubmit=”document.getElementById(‘myButton’).disabled=true;
document.getElementById(‘myButton’).value=’数据正则提交请稍候…’;”
你的表单标记将类似于:
<form action=”contact.php” method=”post”
onsubmit=”document.getElementById(‘myButton’).disabled=true;
document.getElementById(‘myButton’).value=’数据正则提交请稍候…’;”
>
就是这样。这种方法应该于大多数的浏览器(IE  +,FireFox、Opera、…)。
2防止多个表单提交使用cookie
如果你想避免重复提交的整个浏览器会话(或更长),你可以考虑使用Cookie。例如编辑自己的表单处理脚本的浏览器发送cookie的形式后,已被处理,但在此之前的任何HTML或重定向打印头被。将这段代码的mail()命令后,应在大多数情况下:
setcookie(‘FormSubmitted’, ’1′);
然后在处理之前检查cookie。如果有这个访问者已经提交了表单在活跃的浏览器会话。将下列代码添加到窗体的开始处理脚本:
if (isset($_COOKIE['FormSubmitted'])
{
die(‘You may only submit this form once per session!’);
}
就是这样!
如果修改,以阻止重复提交与cookies。注意:在上面的脚本和cookie的打印代码调用后添加一些代码的mail()函数:

 

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目前有3 条留言

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