Vue Js Scroll Down Indicator Line:A scroll down indicator line in Vue.js is a visual element that indicates to users that there is more content below the current viewable area on the webpage. It is typically a thin line or bar that appears at the top or bottom of the screen and moves as the user scrolls down the page. The indicator line can be implemented using Vue.js by creating a component that listens for scroll events and calculates the percentage of the page that has been scrolled. The component then updates the width or position of the indicator line based on the percentage scrolled, giving users a visual cue of how much more content is available.

How can I add a scroll down indicator line using Vue js?

The Below code shows a simple Vue.js application that implements a scroll down indicator line. The line’s width is dynamically calculated based on the user’s scrolling progress.

Here’s how it works:

1. The HTML markup includes a container element with an ID of “app”. Inside this container, there is a div with a class of “scroll-indicator” and a computed style binding that sets its width to the value of the “scrollProgress” computed property.
2. The “scrollPosition” data property is initialized to 0 in the Vue instance’s data object.
3. In the “mounted” lifecycle hook, a “scroll” event listener is added to the window object. Whenever the user scrolls, the “scrollPosition” data property is updated with the current vertical scroll position.
4. The “scrollProgress” computed property calculates the user’s scroll progress as a value between 0 and 1. It divides the “scrollPosition” by the difference between the total document height and the window height.
5. The “scroll-indicator” div’s width is set to the “scrollProgress” value multiplied by 100%, which causes it to fill up the entire width of its container element as the user scrolls down the page.

Overall, this code provides a simple and effective way to implement a scroll down indicator line using Vue.js.

Vue Js Scroll Down Indicator Line Example

<div id="app">
        <div class="scroll-indicator" :style="{ width: `${scrollProgress * 100}%` }"></div>
        <h3>Vue Js Scroll Down Indicator Line</h3>
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      </pre>
    </div>
    <script type="module">
        const app = new Vue({
            el: "#app",
            data() {
                return {
                    scrollPosition: 0
                }
            },
            mounted() {
                window.addEventListener('scroll', () => {
                    this.scrollPosition = window.scrollY
                })
            },
            computed: {
                scrollProgress() {
                    return this.scrollPosition / (document.body.scrollHeight - window.innerHeight)
                }
            },


        })
    </script>

Output of Vue Js Scroll down Indicator Line