Home php教程 php手册 PHP提交表单失败后如何保留填写的信息

PHP提交表单失败后如何保留填写的信息

Jun 13, 2016 am 11:28 AM
php introduce reserve information classmate back fail how submit article form

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。


Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

AI Hentai Generator

AI Hentai Generator

Generate AI Hentai for free.

Hot Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. Best Graphic Settings
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. How to Fix Audio if You Can't Hear Anyone
4 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
WWE 2K25: How To Unlock Everything In MyRise
1 months ago By 尊渡假赌尊渡假赌尊渡假赌

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

PHP 8.4 Installation and Upgrade guide for Ubuntu and Debian PHP 8.4 Installation and Upgrade guide for Ubuntu and Debian Dec 24, 2024 pm 04:42 PM

PHP 8.4 brings several new features, security improvements, and performance improvements with healthy amounts of feature deprecations and removals. This guide explains how to install PHP 8.4 or upgrade to PHP 8.4 on Ubuntu, Debian, or their derivati

Discuss CakePHP Discuss CakePHP Sep 10, 2024 pm 05:28 PM

CakePHP is an open-source framework for PHP. It is intended to make developing, deploying and maintaining applications much easier. CakePHP is based on a MVC-like architecture that is both powerful and easy to grasp. Models, Views, and Controllers gu

CakePHP File upload CakePHP File upload Sep 10, 2024 pm 05:27 PM

To work on file upload we are going to use the form helper. Here, is an example for file upload.

How To Set Up Visual Studio Code (VS Code) for PHP Development How To Set Up Visual Studio Code (VS Code) for PHP Development Dec 20, 2024 am 11:31 AM

Visual Studio Code, also known as VS Code, is a free source code editor — or integrated development environment (IDE) — available for all major operating systems. With a large collection of extensions for many programming languages, VS Code can be c

How do you parse and process HTML/XML in PHP? How do you parse and process HTML/XML in PHP? Feb 07, 2025 am 11:57 AM

This tutorial demonstrates how to efficiently process XML documents using PHP. XML (eXtensible Markup Language) is a versatile text-based markup language designed for both human readability and machine parsing. It's commonly used for data storage an

CakePHP Quick Guide CakePHP Quick Guide Sep 10, 2024 pm 05:27 PM

CakePHP is an open source MVC framework. It makes developing, deploying and maintaining applications much easier. CakePHP has a number of libraries to reduce the overload of most common tasks.

PHP Program to Count Vowels in a String PHP Program to Count Vowels in a String Feb 07, 2025 pm 12:12 PM

A string is a sequence of characters, including letters, numbers, and symbols. This tutorial will learn how to calculate the number of vowels in a given string in PHP using different methods. The vowels in English are a, e, i, o, u, and they can be uppercase or lowercase. What is a vowel? Vowels are alphabetic characters that represent a specific pronunciation. There are five vowels in English, including uppercase and lowercase: a, e, i, o, u Example 1 Input: String = "Tutorialspoint" Output: 6 explain The vowels in the string "Tutorialspoint" are u, o, i, a, o, i. There are 6 yuan in total

Explain JSON Web Tokens (JWT) and their use case in PHP APIs. Explain JSON Web Tokens (JWT) and their use case in PHP APIs. Apr 05, 2025 am 12:04 AM

JWT is an open standard based on JSON, used to securely transmit information between parties, mainly for identity authentication and information exchange. 1. JWT consists of three parts: Header, Payload and Signature. 2. The working principle of JWT includes three steps: generating JWT, verifying JWT and parsing Payload. 3. When using JWT for authentication in PHP, JWT can be generated and verified, and user role and permission information can be included in advanced usage. 4. Common errors include signature verification failure, token expiration, and payload oversized. Debugging skills include using debugging tools and logging. 5. Performance optimization and best practices include using appropriate signature algorithms, setting validity periods reasonably,

See all articles