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jQuery .animate() not producing expected results with CSS transitions on overlapping elements

👀 Views: 55 đŸ’Ŧ Answers: 1 📅 Created: 2025-06-06
jquery css animation JavaScript

I've been working on this all day and I keep running into I'm encountering an issue where I'm trying to animate the width of a div using jQuery's `.animate()` method, but it seems to conflict with CSS transitions applied to that same div. Specifically, I have a fixed-width sidebar that expands on hover with a CSS transition. When I try to programmatically animate the sidebar's width using jQuery, it doesn't seem to work as expected. For instance, I have the following setup: ```html <div id="sidebar" class="sidebar">Content here...</div> <button id="expandButton">Expand</button> ``` ```css .sidebar { width: 200px; transition: width 0.3s; } .sidebar.expanded { width: 400px; } ``` ```javascript $(document).ready(function() { $('#expandButton').on('click', function() { $('#sidebar').animate({ width: '400px' }); }); }); ``` When I click the button, the sidebar does not animate to 400px as intended; instead, it just jumps to that width without the smooth transition. The CSS transition only seems to engage when I add the `.expanded` class, like so: ```javascript $('#expandButton').on('click', function() { $('#sidebar').toggleClass('expanded'); }); ``` This class toggle works fine, but I prefer to use `.animate()` for finer control over the animation. I've tried setting `overflow: hidden;` on the sidebar to prevent layout shifts, but that didn't help. Does anyone know why `.animate()` would conflict with the CSS `transition`, and how I can properly animate the width without losing the smoothness? I'm using jQuery 3.6.0 and testing in Chrome 93. Any insights would be appreciated! Any help would be greatly appreciated! This is part of a larger application I'm building. I'd really appreciate any guidance on this. I'm working with Javascript in a Docker container on Windows 10. I'd really appreciate any guidance on this. I appreciate any insights!