Web Front-end
JS Tutorial
How to perform simple password verification on the form in js? (code example)
How to perform simple password verification on the form in js? (code example)
The content of this article is to introduce js to perform simple verification of form passwords? (code example). It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.
First we need to understandHow to achieve safe password input?
Many websites now require registration, which means users need to be assigned a username and password. Here are some simple steps to make the process safer.
Use "password" input type
Use instead of , because this lets the browser (and the user) know that the content of the field needs to be protected.
The password will not appear on the screen as you type, nor will most browsers "remember" the value entered in the password field like other form elements.
In some cases, such as on mobile devices, displaying passwords can improve usability without compromising security. After all, only the browser display is obfuscated and not the data transferred.
Confirm Password Entry
Because the password entry type obscures the typed text, you should have the user confirm that they did not make a mistake. The easiest way is to enter your password twice and check if they are the same.
Another approach is to display what they entered as part of the "confirmation page". The problem here is that your password is showing up in the browser, browser cache, proxies, etc. For security reasons, passwords should never be displayed in HTML format or sent via email.
Enforce "strong" passwords (complex passwords)
If you are concerned about security, you should have some policy on what constitutes a valid password. Some common restrictions are:
1. At least n characters;
2. A combination of uppercase and lowercase characters;
3. One or more digits;
4. It has nothing to do with other user data (name, address, username, ...);
Now leaving the last requirement, since it requires a server-side script, let's Take a look at the possibilities using client-side HTML and JavaScript.
Server Security
While having a complex password is a good first step, additional steps need to be taken on the server to back it up , to prevent brute force attacks. One popular method is to install Fail2Ban to monitor log files and lock down recurring errors. Of course, this only works if your login system reports failed login attempts to the system log file. Otherwise your application needs to provide this functionality.
Passwords need to be encrypted when stored in the database or elsewhere, and any backups should also be encrypted.
Let's use js to implement a simple form verification operation
The form below has three input fields: username, pwd1 and pwd2. When the form is submitted, the checkForm script parses the input value and returns true or false. If a false value is returned, the form submission will be cancelled.
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<script type="text/javascript">
function checkForm(form) {
if(form.username.value == "") {
alert("错误：用户名不能为空！");
form.username.focus();
return false;
}
re = /^\w+$/;
if(!re.test(form.username.value)) {
alert("错误：用户名必须只包含字母、数字和下划线！");
form.username.focus();
return false;
}
if(form.pwd1.value != "" && form.pwd1.value == form.pwd2.value) {
if(form.pwd1.value.length < 6) {
alert("错误：密码必须至少包含六个字符！");
form.pwd1.focus();
return false;
}
if(form.pwd1.value == form.username.value) {
alert("错误：密码必须与用户名不同！");
form.pwd1.focus();
return false;
}
re = /[0-9]/;
if(!re.test(form.pwd1.value)) {
alert("错误：密码必须包含至少一个数字（0至9）！");
form.pwd1.focus();
return false;
}
re = /[a-z]/;
if(!re.test(form.pwd1.value)) {
alert("错误：密码必须包含至少一个小写字母(a-z)!");
form.pwd1.focus();
return false;
}
re = /[A-Z]/;
if(!re.test(form.pwd1.value)) {
alert("错误：密码必须包含至少一个大写字母(A-Z)!");
form.pwd1.focus();
return false;
}
} else {
alert("错误：请检查并确认您输入的密码是否一致！");
form.pwd1.focus();
return false;
}
alert("You entered a valid password: " + form.pwd1.value);
return true;
}
</script>
</head>
<body>
<form onsubmit="return checkForm(this);">
<p>用户名: <input type="text" name="username"></p>
<p>密 码: <input type="password" name="pwd1"></p>
<p>确认密码: <input type="password" name="pwd2"></p>
<p><input type="submit"></p>
</form>
</body>
</html>Rendering:
When the two passwords we enter are inconsistent, an error will be reported:
Keep in mind that since JavaScript is not available in all browsers, you should also use server-side script to validate all data before logging it to a database or elsewhere.
Summary: The above is the entire content of this article, I hope it will be helpful to everyone's study.
The above is the detailed content of How to perform simple password verification on the form in js? (code example). For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
1387
52
How to use JS and Baidu Maps to implement map pan function
Nov 21, 2023 am 10:00 AM
How to use JS and Baidu Map to implement map pan function Baidu Map is a widely used map service platform, which is often used in web development to display geographical information, positioning and other functions. This article will introduce how to use JS and Baidu Map API to implement the map pan function, and provide specific code examples. 1. Preparation Before using Baidu Map API, you first need to apply for a developer account on Baidu Map Open Platform (http://lbsyun.baidu.com/) and create an application. Creation completed
Recommended: Excellent JS open source face detection and recognition project
Apr 03, 2024 am 11:55 AM
Face detection and recognition technology is already a relatively mature and widely used technology. Currently, the most widely used Internet application language is JS. Implementing face detection and recognition on the Web front-end has advantages and disadvantages compared to back-end face recognition. Advantages include reducing network interaction and real-time recognition, which greatly shortens user waiting time and improves user experience; disadvantages include: being limited by model size, the accuracy is also limited. How to use js to implement face detection on the web? In order to implement face recognition on the Web, you need to be familiar with related programming languages and technologies, such as JavaScript, HTML, CSS, WebRTC, etc. At the same time, you also need to master relevant computer vision and artificial intelligence technologies. It is worth noting that due to the design of the Web side
How to create a stock candlestick chart using PHP and JS
Dec 17, 2023 am 08:08 AM
How to use PHP and JS to create a stock candle chart. A stock candle chart is a common technical analysis graphic in the stock market. It helps investors understand stocks more intuitively by drawing data such as the opening price, closing price, highest price and lowest price of the stock. price fluctuations. This article will teach you how to create stock candle charts using PHP and JS, with specific code examples. 1. Preparation Before starting, we need to prepare the following environment: 1. A server running PHP 2. A browser that supports HTML5 and Canvas 3
Essential tools for stock analysis: Learn the steps to draw candle charts with PHP and JS
Dec 17, 2023 pm 06:55 PM
Essential tools for stock analysis: Learn the steps to draw candle charts in PHP and JS. Specific code examples are required. With the rapid development of the Internet and technology, stock trading has become one of the important ways for many investors. Stock analysis is an important part of investor decision-making, and candle charts are widely used in technical analysis. Learning how to draw candle charts using PHP and JS will provide investors with more intuitive information to help them make better decisions. A candlestick chart is a technical chart that displays stock prices in the form of candlesticks. It shows the stock price
How to use JS and Baidu Map to implement map click event processing function
Nov 21, 2023 am 11:11 AM
Overview of how to use JS and Baidu Maps to implement map click event processing: In web development, it is often necessary to use map functions to display geographical location and geographical information. Click event processing on the map is a commonly used and important part of the map function. This article will introduce how to use JS and Baidu Map API to implement the click event processing function of the map, and give specific code examples. Steps: Import the API file of Baidu Map. First, import the file of Baidu Map API in the HTML file. This can be achieved through the following code:
How to use JS and Baidu Maps to implement map heat map function
Nov 21, 2023 am 09:33 AM
How to use JS and Baidu Maps to implement the map heat map function Introduction: With the rapid development of the Internet and mobile devices, maps have become a common application scenario. As a visual display method, heat maps can help us understand the distribution of data more intuitively. This article will introduce how to use JS and Baidu Map API to implement the map heat map function, and provide specific code examples. Preparation work: Before starting, you need to prepare the following items: a Baidu developer account, create an application, and obtain the corresponding AP
PHP and JS Development Tips: Master the Method of Drawing Stock Candle Charts
Dec 18, 2023 pm 03:39 PM
With the rapid development of Internet finance, stock investment has become the choice of more and more people. In stock trading, candle charts are a commonly used technical analysis method. It can show the changing trend of stock prices and help investors make more accurate decisions. This article will introduce the development skills of PHP and JS, lead readers to understand how to draw stock candle charts, and provide specific code examples. 1. Understanding Stock Candle Charts Before introducing how to draw stock candle charts, we first need to understand what a candle chart is. Candlestick charts were developed by the Japanese
How to use JS and Baidu Maps to implement map polygon drawing function
Nov 21, 2023 am 10:53 AM
How to use JS and Baidu Maps to implement map polygon drawing function. In modern web development, map applications have become one of the common functions. Drawing polygons on the map can help us mark specific areas for users to view and analyze. This article will introduce how to use JS and Baidu Map API to implement map polygon drawing function, and provide specific code examples. First, we need to introduce Baidu Map API. You can use the following code to import the JavaScript of Baidu Map API in an HTML file
