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PHP提交表单失败后如何保留填写的信息

Jun 13, 2016 am 11:28 AM
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本文章来给各位同学介绍PHP提交表单失败后如何保留填写的信息一些方法总结,最常用的就是使用缓存方式了,这种方法如果网速慢是可能出问题的,最好的办法就是使用ajax了。

1.使用header头设置缓存控制头Cache-control。

PHP代码
1.

 代码如下 复制代码
header('Cache-control: private, must-revalidate'); //支持页面回跳

2.使用session_cache_limiter方法。

PHP代码

 代码如下 复制代码
1.session_cache_limiter('private, must-revalidate'); //要写在session_start方法之前

下面介绍一下session_cache_limiter参数:

session_cache_limiter内的几个参数意义是:
nocache:当然是不缓存(比如:表单信息被清除),但公共变量可以缓存
private:私有方式缓存(比如:表单信息被保留,但在生存期内有效)
private_no_cache:私有方式但不过期(表单信息被保留)
publice:公有方式,(表单信息也被保留)

设置缓存过期时间:session_cache_expire函数设置,缺省是180分钟。

常遇见问题:

1。session_cache_limiter("private");表单信息是保留了,但是如果我修改已经提交的信息,表单页面所呈现的信息还是缓存里信息,没能及时自动刷新,如果不用session_cache_limiter("private");又不能保留表单信息

解决方案:

在session_start前面加上

 代码如下 复制代码

session_cache_limiter( "private, must-revalidate" );即可


另一种办法我们可以使用ajax来实例


index.html模板文件大内容:

 代码如下 复制代码



jQuery Ajax 实例演示






输入姓名:


输入密码:







最初的源码里面好像有一点bug,修改后正常运行。

login.php文件的内容:

 代码如下 复制代码
echo json_encode(array ('username'=>$_REQUEST['username'],'password'=>$_REQUEST['password']));
?>

这样的话我们提交不需要刷新页面了,如果失败就直接会有提交了,这样可以100%保存提交失败后数据不被丢失了哦。


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