Angular resizeobserver debounce, Conclusion ResizeObserver is a powerful API for tracking element size changes in Angular applications. If you actually intend to have an infinite loop, you just need to defer the resizing code in your ResizeObserver callback to after the browser repaints. We can easily fix that by manually running it in the zone. The handler will change the background color of the textarea, but only if 1 second passed after the . You can observe multiple elements with one ResizeObserver. 🚀 ResizeObserver in a nutshell Here is an example on how to use ResizeObserver to subscribe to a resize event of an element. Introduction to ResizeObserver ResizeObserver is a relatively new JavaScript API introduced to address the shortcomings of traditional methods for tracking changes in DOM element size. To demo this, here is a textarea element, which by default can be resized interactively. onresize doesn't. In years gone by, their actual implementations were all-to-often hacky and/or brittle. Oct 13, 2025 · ResizeObserver makes listening to element size changes precise, efficient, and elegant. Resolve the ResizeObserver loop error in Angular with solutions like debouncing events, avoiding recursive changes, using NgZone, and proper cleanup of observers. Now that we know why we need the new ResizeObserver Api we will take a closer look at it. Nov 7, 2025 · If you want to prevent these errors, the solution depends on what your intended effect is. This means that this callback runs outside of the zone. One of the main attributes of responsive design is its responsivity to changes in an element’s size. 60 times per second), so there shouldn't be any need to throttle or debounce in most cases. It will indeed be simpler to just throttle/debounce the callback function that you pass to that constructor. May 25, 2021 · Debounce — handle browser resize like a pro I was recently tasked with fixing some UI bugs at work. Have you used ResizeObserver in your projects? Finding ResizeObserver with Typescript in Angular 9 Asked 5 years, 11 months ago Modified 3 years, 8 months ago Viewed 41k times Oct 6, 2021 · The behaviour of ResizeObserver could only be modified if you would recreate that constructor. Contribute to kmaida/angular-resize development by creating an account on GitHub. Oct 1, 2023 · In-Depth Examples of Using ResizeObserver Advanced Tips and Best Practices Using ResizeObserver in Frameworks like React and Angular Conclusion 1. resize — embrace the native solution built for modern web layouts. Feb 24, 2020 · The ResizeObserver triggers but the window. You can put it into a requestAnimationFrame callback. Jun 6, 2025 · Debounce or throttle resize events if handling heavy computations. Stop fighting with window. Our navbar wasn’t refreshing with more items when the browser was resized. Feb 24, 2020 · Unfortunately the template is not rerendered and keeps the initial value. The reason is that Angular has monkey-patched most of the events but not (yet) ResizeObserver. Jul 23, 2019 · is it possible to use debounce for the observer? The ResizeObserver callback already runs at most once per animation frame (once per draw to the screen; approx. Moreover, applications could only monitor changes to the viewport; changes to specific elements’ sizes – especially those that were not a container of some sort – Jul 5, 2016 · In one of our apps we also had the implementation Thierry Templier proposes, but I noticed that Angular's change detection is firing (a lot) on window resize, which makes our app slow on resize. Whether using a directive or a service, integrating it is straightforward and improves responsiveness. Debounced window resize service in AngularJS.


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