How to password protect a page using only HTML, CSS and JavaScript?-JS Tutorial-php.cn

Home

Web Front-end

JS Tutorial

How to password protect a page using only HTML, CSS and JavaScript?

WBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWB

Sep 07, 2023 pm 02:33 PM

如何仅使用 HTML、CSS 和 JavaScript 来密码保护页面？

Password protection is an important security measure for web pages that contain sensitive information or require authentication to access. If you want to add extra security to your web pages without using a server-side language, you can password-protect your pages using HTML, CSS, and JavaScript.

This article will show you how to create a simple form that requires users to enter a password to view the contents of a protected page. Let’s look at the following example to better understand using password to protect a page.

Example

In the example below, we are running a script and protecting a web page; if the user attempts to access the web page, they will be prompted for a password.

<!DOCTYPE html>
<html>
   <body>
      <script>
         var password = "tutorial";
         (function passcodeprotect() {
            var passcode = prompt("Enter PassCode");
            while (passcode !== password) {
               alert("Incorrect PassCode");
               return passcodeprotect();
            }
         }());
         alert('Welcome To The TP..!');
      </script>
   </body>
</html>

When the script is executed, it will generate an output showing an alert asking for a password. When the user matches the password ("tutorial"), a message is displayed; otherwise, the incorrect password is displayed on the web page.

Example

Consider the following example where we create an input field for a password to be entered to protect a web page as well as a button click.

<!DOCTYPE HTML>
<html>
   <body>
      <center>
         <input type="password" placeholder="passcode" id="tutorial">
         <button onclick="protectpasscode()">CHECK</button>
         <script>
            function protectpasscode() {
               const result = document.getElementById("tutorial").value;
               let passcode = 12345;
               let space = '';
               if (result == space) {
                  alert("Type passcode")
               } else {
                  if (result == passcode) {
                     document.write("<center><h1 id="TP-The-Best-E-Learning">TP, The Best E-Learning </h1></center>");
                  } else {
                     alert("Incorrect Passcode");
                     location.reload();
                  }
               }
            }
         </script>
      </center>
   </body>
</html>

When running the above script, an output window will pop up showing the input field for entering the password and the click button on the web page. If the user matches the password (12345), it will open a form consisting of text; otherwise, the wrong password will be displayed.

Example

Execute the following example where we run a script to protect a web page from displaying its content after executing the script.

<!DOCTYPE html>
<html>
   <body style="background-color:#EAFAF1">
      Enter Password:
      <input type='text' value='' id='input'><br><br>
      <input type='checkbox' onclick='protectpasscode()'>Show results
      <p id='tutorial' style='display:none; color: black;'>Mahendra Singh Dhoni, also known as MS Dhoni, is an Indian former international
      cricketer who was captain of the Indian national cricket team in limited-overs formats
      from 2007 to 2017 and in Test cricket from 2008 to 2014. </p>
      <script>
         function protectpasscode() {
            var a = document.getElementById('input');
            var b = document.getElementById('tutorial');
            if (a.value === '54') {
               b.style.display = 'block';
            } else {
               b.style.display = 'none';
            }
         }
      </script>
   </body>
</html>

When the script is executed, it will generate an output showing the input field for entering the password and the toggle checkbox on the web page. When the user matches the password (54) and toggles the checkbox, the content within the web page is displayed.

The above is the detailed content of How to password protect a page using only HTML, CSS and JavaScript?. For more information, please follow other related articles on the PHP Chinese website!

Statement

This article is reproduced at:tutorialspoint. If there is any infringement, please contact admin@php.cn delete

Python vs. JavaScript: A Comparative Analysis for DevelopersMay 09, 2025 am 12:22 AM

The main difference between Python and JavaScript is the type system and application scenarios. 1. Python uses dynamic types, suitable for scientific computing and data analysis. 2. JavaScript adopts weak types and is widely used in front-end and full-stack development. The two have their own advantages in asynchronous programming and performance optimization, and should be decided according to project requirements when choosing.

Python vs. JavaScript: Choosing the Right Tool for the JobMay 08, 2025 am 12:10 AM

Whether to choose Python or JavaScript depends on the project type: 1) Choose Python for data science and automation tasks; 2) Choose JavaScript for front-end and full-stack development. Python is favored for its powerful library in data processing and automation, while JavaScript is indispensable for its advantages in web interaction and full-stack development.

Python and JavaScript: Understanding the Strengths of EachMay 06, 2025 am 12:15 AM

Python and JavaScript each have their own advantages, and the choice depends on project needs and personal preferences. 1. Python is easy to learn, with concise syntax, suitable for data science and back-end development, but has a slow execution speed. 2. JavaScript is everywhere in front-end development and has strong asynchronous programming capabilities. Node.js makes it suitable for full-stack development, but the syntax may be complex and error-prone.

JavaScript's Core: Is It Built on C or C ?May 05, 2025 am 12:07 AM

JavaScriptisnotbuiltonCorC ;it'saninterpretedlanguagethatrunsonenginesoftenwritteninC .1)JavaScriptwasdesignedasalightweight,interpretedlanguageforwebbrowsers.2)EnginesevolvedfromsimpleinterpreterstoJITcompilers,typicallyinC ,improvingperformance.

JavaScript Applications: From Front-End to Back-EndMay 04, 2025 am 12:12 AM

JavaScript can be used for front-end and back-end development. The front-end enhances the user experience through DOM operations, and the back-end handles server tasks through Node.js. 1. Front-end example: Change the content of the web page text. 2. Backend example: Create a Node.js server.

Python vs. JavaScript: Which Language Should You Learn?May 03, 2025 am 12:10 AM

Choosing Python or JavaScript should be based on career development, learning curve and ecosystem: 1) Career development: Python is suitable for data science and back-end development, while JavaScript is suitable for front-end and full-stack development. 2) Learning curve: Python syntax is concise and suitable for beginners; JavaScript syntax is flexible. 3) Ecosystem: Python has rich scientific computing libraries, and JavaScript has a powerful front-end framework.

JavaScript Frameworks: Powering Modern Web DevelopmentMay 02, 2025 am 12:04 AM

The power of the JavaScript framework lies in simplifying development, improving user experience and application performance. When choosing a framework, consider: 1. Project size and complexity, 2. Team experience, 3. Ecosystem and community support.

The Relationship Between JavaScript, C , and BrowsersMay 01, 2025 am 12:06 AM

Introduction I know you may find it strange, what exactly does JavaScript, C and browser have to do? They seem to be unrelated, but in fact, they play a very important role in modern web development. Today we will discuss the close connection between these three. Through this article, you will learn how JavaScript runs in the browser, the role of C in the browser engine, and how they work together to drive rendering and interaction of web pages. We all know the relationship between JavaScript and browser. JavaScript is the core language of front-end development. It runs directly in the browser, making web pages vivid and interesting. Have you ever wondered why JavaScr

See all articles