How to Make Your SVG Graphics Animate on Scroll with JavaScript

Описание: Discover how to trigger SVG animations when they enter the viewport using JavaScript and CSS. Perfect for enhancing user engagement!
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This video is based on the question https://stackoverflow.com/q/64117120/ asked by the user 'Agxer' ( https://stackoverflow.com/u/13987068/ ) and on the answer https://stackoverflow.com/a/64117491/ provided by the user 'johannchopin' ( https://stackoverflow.com/u/8583669/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Make Your SVG Graphics Animate on Scroll with JavaScript

SVG graphics are an excellent way to make your web pages visually appealing and interactive. However, if your SVGs are hidden below the fold, they won't be noticeable to users until they scroll down. A common question arises: how can you make SVG graphics trigger their animations when they come into view? If you're facing this challenge, don’t worry! In this guide, we’ll guide you through a simple yet effective solution that will allow your SVG animations to play only once when they enter the viewport.

Understanding the Problem

For many web developers, implementing animations on page load is straightforward. But when dealing with SVGs that have complex animations constructed using @ keyframes and several paths — as in the case of a calligraphic arrow shape — the task becomes a little more tricky, especially since the animations might be designed to play in a specific sequence.

Key Points to Consider:

SVG Complexity: The SVG animations that utilize multiple path elements and masking can complicate traditional solutions for triggering animations.

Viewport Awareness: You want the animations to play when users scroll and see the SVG, not when the page loads.

Animation State Control: Each SVG should only animate once when it becomes visible, avoiding repeated triggers on scrolling.

The Solution: Triggering SVG Animation on Scroll

To achieve the desired result, you'll need to combine JavaScript with some CSS. The steps below will illustrate how to detect when the SVG graphics come into the viewport and how to apply the animation class dynamically.

Step 1: Modifying the HTML

Ensure your SVG graphic is wrapped in a div with a unique ID. Your SVG code may look similar to this:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Adding CSS for Animation

Next, you need to prepare CSS that will be used to control the animations when the .play class is added to the SVG wrapper. Here’s an example:

[[See Video to Reveal this Text or Code Snippet]]

Each mask in your SVG will need similar styles for enabling their animations.

Step 3: Write JavaScript to Detect Scroll Events

Now, let’s write the JavaScript code that will listen for scrolling events and trigger the animations:

[[See Video to Reveal this Text or Code Snippet]]

Explanation of the JavaScript Code:

Body Reference: We get a reference to the body of the document for scroll events.

Target SVG DIV: The SVG container is referenced by its ID (arrow-1id).

Scroll Event: We use onscroll to execute a function every time the user scrolls.

Scroll Position Check: If the scroll position is greater than or equal to the top of the SVG (adjusted by an offset), we add the play class.

Step 4: Testing and Adjusting

Once you have the HTML, CSS, and JavaScript set up, test it out! Scroll down the page and watch the SVG animate as it comes into view. You may want to adjust the scroll position check (the 200 offset) based on your specific layout and how far from the top of the viewport you want the animation to trigger.

Conclusion

With this guide, you can effectively make your SVG graphics animate on scroll. This enhances user interaction, making your pages feel dynamic and responsive. Don’t hesitate to tweak the parameters to suit your design best! Now, you can create engaging visuals that draw attention and create a memorable experience for your users.

Feel free to reach out if you have any questions or need further assistance in implementing SVG animations effectively!