Скачать или смотреть Fade HTML DOM Elements on Scroll: The Ultimate Guide to Using jQuery Effectively

Discover how to make your `.title` class fade in and out based on scroll position using jQuery. This guide breaks down the solution for seamless user experience.
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This video is based on the question https://stackoverflow.com/q/64833796/ asked by the user 'Bryan Somto' ( https://stackoverflow.com/u/14082229/ ) and on the answer https://stackoverflow.com/a/64834130/ provided by the user 's.kuznetsov' ( https://stackoverflow.com/u/13573444/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Fade HTML DOM Elements on Scroll: A jQuery Guide

Scrolling through a webpage can often feel monotonous, but animating elements as they come into view can create a more engaging user experience. A common issue faced by many developers is enabling a specific HTML element, like a title, to fade in or out as the user scrolls down the page. In this guide, we’ll explore a simple yet effective solution to make your .title class fade when the .top class is scrolled to 150 pixels.

The Problem

You want to use jQuery to ensure that when the page is scrolled down past a certain point (150 pixels), a specific element with the .title class will fade in and out. However, your initial code has a small mistake that's preventing it from working effectively.

Here’s the problem code you might be encountering:

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

Common Pitfalls in the Code

Event Binding: The scroll event should be attached to $(window) instead of the .top class, as scrolling occurs on the window, not a specific element.

Comparison Operator: The condition $(this).scrollTop = 150 uses a single equal sign (=), which is an assignment operator. To compare values, use the double equal signs (==) or the triple equal signs (===).

The Solution

Here’s the corrected version of the JavaScript code.

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

Explanation of the Code

$(document).ready(...): This ensures that the jQuery code runs once the page is fully loaded.

$(window).on("scroll", …): This binds the scroll event to the entire window.

$(this).scrollTop(): This method gets the current vertical position of the scroll bar for the window.

fadeToggle(1000): This function smoothly toggles the visibility of .title over 1 second (1000 milliseconds).

Additional Setup for a Complete Example

Along with this JavaScript code, you'll need the corresponding HTML and CSS to create a complete demo. Here’s what that looks like:

HTML Code

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

CSS Code

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

Bringing It All Together

HTML Structure: The HTML includes a div with a class of .top containing our .title paragraph.

Scrollbar: Make sure the .top div is tall enough to actually scroll (3000px in this example).

CSS Styling: The .title class is styled to be sticky and visually stands out against the green background.

Conclusion

By following these steps, you can easily implement a fade effect on your webpage, enhancing user interaction when scrolling. This not only garners attention but can also help users focus on critical information as they navigate your site.

If you have questions or tips based on your own experiences with jQuery fades, feel free to share in the comments below!