HTML+CSS+JS realizes the scrolling gradient effect of the navigation bar

First look at the effect:
accomplish:
Summarize:

First look at the effect:

insert image description here

accomplish:

1. Define the text label of the navigation bar:

<div class="tou">
        <sapn class="logo"> Northern Lights. </sapn>
        <ul class="biao">
        <li><a href="#"><a href="#">Home</a></li>
        <li><a href="#">Personal Profile</a></li>
        <li><a href="#">Article</a></li>
        <li><a href="#">Message Board</a></li>
        <li><a href="#">Friends Links</a></li>
        </ul>
    </div>

2. The overall style of the navigation bar:

.tou{
             position: fixed;
             top: 0;
             left: 0;
             padding: 25px 100px;
             width: 100%;
             display: flex;
             justify-content: space-between;
             align-items: center;
            transition: 0.5s;
         }

transition
3. The style of the Northern Lights logo:

 .logo{
             position: relative;
             font-size: 22px;
             font-weight: 900;
             letter-spacing: 1px;
             color: rgb(28, 36, 148);
         }

letter-spacing: text (letter) spacing

4. Position an image to the left of the text for the Northern Lights logo:

.logo::before{
            content: '';
            position: absolute;
            left: -50px;
            top: -15px;
            width: 50px;
            height: 50px;
            background-image: url(logo.png);
            background-size: 100%;
         }

5. Some styles of the navigation labels on the right will not be described in detail, after all, everyone's styles are different~:

.biao{
             position: relative;
             display: flex;
             justify-content: center;
             align-content: center;
            list-style: none;
            
         }
        .biao li{
             position: relative;
         }
        .biao a{
             position: relative;
             margin: 0 10px;
             font-size: 18px;
             font-family: 'fangsong';
             font-weight: bold;
             color: rgb(28, 36, 148);
             text-decoration: none;

         }

6. When the page is scrolled, the navigation bar style, padding becomes smaller, the font color changes, and a blue background color appears:

 .bian{
            padding: 15px 100px;
            background-color: rgb(71, 105, 219);
        }
        .bian .logo,.tou.bian a{
            color: rgb(252, 247, 247);
        }

7. Simple js, implementation part:
The first one:

window.addEventListener('scroll',function(){
            let tou = document.querySelector('.tou');
           if(window.scrollY>0)
            {
                tou.classList.add("bian");
            }else{
                tou.classList.remove("bian");
            }
        })

The second method: directly like this:

window.addEventListener('scroll',function(){
            let tou = document.querySelector('.tou');    
            tou.classList.toggle("bian",window.scrollY>0);

        })

explain:
scrollY property:
The read-only scrollY property of the Window interface returns the number of pixels that the document is currently scrolled vertically.

classList attribute:
add(class1, class2, …) adds one or more class names to an element. If the specified class name already exists, it will not be added ;
remove(class1, class2, …) Removes one or more class names from an element.
toggle(class, true|false) The first parameter is the class name to be removed if it already exists , and returns false. If the class name does not exist, it will be added to the element and true will be returned. The second is an optional parameter, a Boolean value used to set whether the element is forced to add or remove the class , regardless of whether the class name exists.

so:
The first js writing method is to add the class .biao to achieve a gradient effect when the scroll is > 0, and remove the .biao class to return to the original state when the scroll is <= 0;
The second is a Boolean value judgment. When the scroll is > 0, the .biao class is added forcibly, and when the scroll is <= 0, the .biao class is removed;

Full code:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        *{
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            
        }
        body{
            height: 200vh;
            
        }
        .tou{
             position: fixed;
             top: 0;
             left: 0;
             padding: 25px 100px;
             width: 100%;
             display: flex;
             justify-content: space-between;
             align-items: center;
            transition: 0.5s;
         }
        .logo{
             position: relative;
             font-size: 22px;
             font-weight: 900;
             letter-spacing: 1px;
             color: rgb(28, 36, 148);
         }
         .logo::before{
            content: '';
            position: absolute;
            left: -50px;
            top: -15px;
            width: 50px;
            height: 50px;
            background-image: url(logo.png);
            background-size: 100%;
         }
         .biao{
             position: relative;
             display: flex;
             justify-content: center;
             align-content: center;
            list-style: none;
            
         }
        .biao li{
             position: relative;
         }
        .biao a{
             position: relative;
             margin: 0 10px;
             font-size: 18px;
             font-family: 'fangsong';
             font-weight: bold;
             color: rgb(28, 36, 148);
             text-decoration: none;

         }
          
        .bian{
            padding: 15px 100px;
            background-color: rgb(71, 105, 219);
        }
        .bian .logo,.tou.bian a{
            color: rgb(252, 247, 247);
        }
       /* Background image style */
        .bjimg {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      min-width: 1000px;
      z-index: -10;
      zoom: 1;
      background-color: #fff;
      background-image: url(11.jpg) ;
      background-repeat: no-repeat;
      background-size: cover;
      -webkit-background-size: cover;
      -o-background-size: cover;
      background-position: center 0;
    }

    </style>
</head>
<body>
    <!-- Background image -->
    <div class="bjimg"></div>

   <!-- Navigation Bar -->
    <div class="tou">
        <sapn class="logo"> Northern Lights. </sapn>
        <ul class="biao">
        <li><a href="#"><a href="#">Home</a></li>
        <li><a href="#">Personal Profile</a></li>
        <li><a href="#">Article</a></li>
        <li><a href="#">Message Board</a></li>
        <li><a href="#">Friends Links</a></li>
        </ul>
    </div>
    <script>
        window.addEventListener('scroll',function(){
            let tou = document.querySelector('.tou');
            
           
           /* tou.classList.toggle("bian",window.scrollY>0); */
           if(window.scrollY>0)
            {
                tou.classList.add("bian");
            }else{
                tou.classList.remove("bian");
            }
        })
    </script>
</body>
</html>

Summarize:

This is the end of this article about how to achieve the scrolling gradient effect of the navigation bar with html+css+js. For more related html+css+js navigation bar scrolling gradient content, please search 123WORDPRESS.COM's previous articles or continue to browse the related articles below. I hope you will support 123WORDPRESS.COM in the future!

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