How to use Layui to develop a login system that supports randomly generated verification codes

How to use Layui to develop a login system that supports randomly generated verification codes

Layui is a very popular front-end UI framework that provides a wealth of components and styles. It can help developers build beautiful and easy-to-use interfaces more quickly and easily. This article will introduce how to use Layui to develop a login system that supports randomly generated verification codes to increase system security. Below are specific code examples.

1. Preparation

1. Download the latest version of Layui and introduce CSS and JS files into HTML.
2. Create an HTML file named login.html for writing the HTML code of the login page.
3. Create a JavaScript file named login.js in the same directory to write the logic code of the login page.

2. Implement the login page

1. In login.html, use the form component provided by Layui to build a login form, including user name, password and verification Code:

   <form class="layui-form" action="">
     <div class="layui-form-item">
    <label class="layui-form-label">用户名</label>
    <div class="layui-input-block">
      <input type="text" name="username" required  lay-verify="required" placeholder="请输入用户名" autocomplete="off" class="layui-input">
    </div>
     </div>
     <div class="layui-form-item">
    <label class="layui-form-label">密码</label>
    <div class="layui-input-block">
      <input type="password" name="password" required lay-verify="required" placeholder="请输入密码" autocomplete="off" class="layui-input">
    </div>
     </div>
     <div class="layui-form-item">
    <label class="layui-form-label">验证码</label>
    <div class="layui-input-inline">
      <input type="text" name="captcha" required lay-verify="required" placeholder="请输入验证码" autocomplete="off" class="layui-input">
    </div>
    <div class="layui-input-inline">
      <img src="" alt="captcha" id="captchaImg">
    </div>
    <div class="layui-input-inline">
      <a href="#" id="refreshCaptcha">刷新验证码</a>
    </div>
     </div>
     <div class="layui-form-item">
    <div class="layui-input-block">
      <button class="layui-btn" lay-submit lay-filter="login">立即登录</button>
    </div>
     </div>
   </form>

2. In login.js, use the form module provided by Layui to initialize the form and add the logic for refreshing the verification code:

   layui.use(['form'], function(){
     var form = layui.form;
     
     // 初始化表单
     form.render();
     
     // 验证码刷新
     var captchaImg = document.getElementById('captchaImg');
     var refreshCaptcha = document.getElementById('refreshCaptcha');
     refreshCaptcha.onclick = function() {
    captchaImg.src = '/captcha.php?' + Math.random();
     };
   });

   3. Add verification code Function

3. Prepare an interface for generating verification codes on the server side, such as captcha.php. This interface returns a randomly generated verification code image.

4. Add a dynamic address in the img tag of the verification code image in login.html to display the generated verification code image.

   <img src="" alt="captcha" id="captchaImg">

5. In login.js, add the function of getting and setting the verification code image:

   layui.use(['form'], function(){
     var form = layui.form;
     
     // 初始化表单
     form.render();
     
     // 验证码刷新
     var captchaImg = document.getElementById('captchaImg');
     var refreshCaptcha = document.getElementById('refreshCaptcha');
     refreshCaptcha.onclick = function() {
    captchaImg.src = '/captcha.php?' + Math.random();
     };
     
     // 获取验证码图片
     captchaImg.src = '/captcha.php';
   });

   Through the above steps, we have implemented a method that supports randomly generating verification codes login system. Users can enter their username, password and verification code on the login page, and click the Login Now button for verification. When the Refresh Verification Code button next to the verification code input box is clicked, a new verification code image will be regenerated and displayed.

It should be noted that the above code is just a basic example, and more error handling and security verification need to be done in actual development. At the same time, the specific implementation process needs to be appropriately adjusted according to the calling method of the back-end interface.

Through the cooperation of the Layui framework and the server side, we can easily generate and use verification codes to improve system security. Hope this article is helpful to you.

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