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How to create dark/light mode for website using JavaScript/jQuery?

王林
王林forward
2023-09-14 22:13:021327browse

如何使用 JavaScript/jQuery 为网站创建暗/亮模式？

Dark mode is very important for any website. Users with different interests visit the website. Some people like dark mode and some people like light mode.

According to a survey, about 70% to 80% of people prefer dark mode and only 20% to 30% prefer light mode. Therefore, it is necessary to create a dark mode for any website that allows users to switch between dark and light modes.

Below, we will create a simple web page using HTML, CSS and JavaScript. Additionally, we will learn to implement light and dark modes using JavaScript and CSS.

grammar

Users can switch between dark and light themes by following the following syntax. 

body.classList.toggle("dark-theme");

In the above syntax, we pass the dark theme class name as the parameter of the switching method. It adds and removes classes from specific HTML elements.

algorithm

Users can switch between dark and light themes according to the following algorithm.

  • Step 1 - Write the HTML code for the web page and apply CSS as usual for the light theme.

  • Step 2 - Use CSS to create styles for the dark theme.

  • Step 3 - Create a button and add onclick event to the button. When the user clicks the button, it should toggle between dark and light themes.

  • Step 4 - To switch between dark and light themes, we can add and remove specific classes from the elements. For example, create a class for dark theme and create CSS for dark theme. When we add the dark-theme class in the body, the dark theme should be applied to the entire website and when we remove it, it should be normal.

Example 1

In the example below, when the user clicks the button, we call the changeMode() function. The changeMode() function changes the button's text according to the theme.

Additionally, we use document.body to access the entire webpage and use JavaScript to add the dark-theme class to the entire webpage to change the theme to dark mode. 



   


   
Using the  toggle method to  toggle between light and dark mode in JavaScript. 

   
This is the content of the webpage. 

   
   <script>
      function changeMode() {
         var body = document.body;
         
         // toggle the theme
         body.classList.toggle(&quot;dark-theme&quot;);
         let button = document.getElementById('button');
         
         // change the button text
         if (button.innerHTML == "Dark Mode") {
            button.innerHTML = "Normal Mode";
         } else {
            button.innerHTML = "Dark Mode"
         }
      }
   </script>

Example 2

In the example below, we create a toggle button using HTML and CSS. We used checkboxes for toggle switches. So whenever the user checks the checkbox, the switch turns on. So we can add and remove classes for the dark theme depending on whether the checkbox is checked or not.

In addition, we also used JQuery's addClass() and removeClass() methods to add and remove classes in the body. 

<html>
<head>
   <style>
      body {
         color: black;
         background-color: rgb(241, 241, 241);
         text-align: center;
         justify-content: center;
      }
      .dark-class {
         color: white;
         background-color: rgb(12, 10, 10);
      }
      p {
         font-size: 1.2rem;
      }
      .toggleButton {
         width: 5rem;
         height: 2rem;
         position: relative;
         display: inline-block;
      }
      .toggleButton input {
         opacity: 0;
      }
      .roundButton {
         background-color: black;
         top: 0;
         left: 0;
         position: absolute;
         right: 0;
         bottom: 0;
         cursor: pointer;
      }
      .roundButton:before {
         left: 0;
         bottom: 0;
         position: absolute;
         content: "";
         background-color: grey;
         transition: 1s;
         height: 2rem;
         width: 2rem;
      }
      input:checked+.roundButton {
         background-color: white;
      }
      input:checked+.roundButton:before {
         transform: translateX(3rem);
      }
      .roundButton.circle {
         border-radius: 2rem;
      }
      .roundButton.circle:before {
         border-radius: 50%;
      }
   </style>
   <script src = "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.6.3/jquery.min.js"
   Integrity = "sha512-STof4xm1wgkfm7heWqFJVn58Hm3EtS31XFaagaa8VMReCXAkQnJZ+jEy8PCC/iT18dFy95WcExNHFTqLyp72eQ=="
   crossorigin = "anonymous" referrerpolicy = "no-referrer"> </script>
</head>
<body>
   <h2>Using the <i> JQuery </i> to toggle between light and dark modes in JavaScript.</h2>
   <p>This is the content of the webpage.</p>
   <label class = "toggleButton">
      <input type = "checkbox" id = "toggle">
      <div class = "roundButton circle" ></div>
   </label>
   <script>
      // If the input checkbox is checked, activate dark mode by adding dark-class to the body
      $('#toggle').change(() => {
         if ($('#toggle').is(":checked")) {
            $("body").addClass("dark-class");
         } else {
            $("body").removeClass("dark-class")
         }
      })
   </script>
</body>
</html>

We learned to switch between dark mode and light mode using JavaScript and JQuery. We need to change the CSS of the web page and apply the CSS to the dark theme. We can apply CSS to dark mode by adding and removing classes from the web page.

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