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To append new items to the list as the user scrolls to the bottom, we need to add some RxJS magic to our app. Below is a 1 min demo of what we are going to build. Once we have this information, we will fetch the next set of 10 photos. Site Maintenance- Friday, January 20, 2023 02:00 UTC (Thursday Jan 19 9PM Were bringing advertisements for technology courses to Stack Overflow, Angular/RxJS When should I unsubscribe from `Subscription`. Your email address will not be published. Infinite scrolling is a UX pattern that allows a customer to load content continuously as the customer scrolls down the page, ensuring the customer always has new content to consume. I just want this event to be manually triggered by the user. It should load as much contents as the size of the page. Since scrolling events are one example of a stream of data, we can leverage the power of RxJS to detect whether the user has reached the end of our list. the bottom percentage point of the scroll nob relatively to the infinite-scroll container (i.e, 2 (2 * 10 = 20%) is event is triggered when 80% (100% - 20%) has been scrolled). Use Git or checkout with SVN using the web URL. If the intersectionRatio is anything other than 1,this implies the target photo is not completely visible in the viewport and the @Output() elementVisible will communicate this to the component by passing false to the getAlbumData() in the component. 1 op. Thank you to all our backers! When the user reaches the bottom of the scrollable element (with a fixed height), the event 'scrolled' will trigger and call an API to load more items into this element. As a result, now we have a small 20-item list which scrolls nicely and has a menu icon with each item, which opens up an Angular Material menu. 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Heres a snapshot of the heap memory when the list size was 5000 and a GIF showing the UI degradation for the menu opening. This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. Legal Workflow Automation: An ultimate guide to improve Legal efficiency, Progressive Web App Development using React.js: A comprehensive guide. We and our partners use cookies to Store and/or access information on a device. Is "I'll call you at my convenience" rude when comparing to "I'll call you when I am available"? Created with StackBlitz . 528), Microsoft Azure joins Collectives on Stack Overflow. In such a case, it will take loads of time to load, even if it is loaded it will be unmanageable for limited resources for browsers to render. Did Richard Feynman say that anyone who claims to understand quantum physics is lying or crazy? This Angular post is compatible with Angular 4 upto latest versions, Angular 7, Angular 8, Angular 9, Angular 10, Angular 11, Angular 12 and Angular 13. The title, content and the image for each item are generated randomly. And were done! Your solution works. it was not working correctly with '(this.items.length-this.itemSize-1)*10' value on stackblitz, so i had to hardcode it as 820. If it is, we set it as the root element. To read more about this Find centralized, trusted content and collaborate around the technologies you use most. Once the data is fetched, we concat the 10 photos(110) to the previous content of albumData. How can I use/create dynamic template to compile dynamic Component with Angular 2.0? How Microsoft Office 365 Add-Ins can supercharge your productivity. To achieve VirtualScroll you need fixed height items and you can use the materialCDK: https://material.angular.io/cdk/scrolling/overview, To achieve InfinityScroll I recommend you to use Intersection Observers: The root property indicates the element that is used as the viewport for checking the visibility of the target. The consent submitted will only be used for data processing originating from this website. All we did was to replace the parent container with cdk-virtual-scroll-viewport. The end result will be the following material list, which loads up more items when you scroll down to the end. Finally, we dont want memory leaks in our application, so well disconnect the observer when the component destroyed: The Intersection Observer API works in most major browsers. Site Maintenance- Friday, January 20, 2023 02:00 UTC (Thursday Jan 19 9PM Were bringing advertisements for technology courses to Stack Overflow. This argument could be true/false which is decided by the directive. Connect and share knowledge within a single location that is structured and easy to search. Lets begin with the AlbumComponent where we are displaying the photos. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. They are 2 objects displayed by row. Why is sending so few tanks Ukraine considered significant? Learn more. Angular Infinite Scroll Example Call API Starter project for Angular apps that exports to the Angular CLI id1945 1.7k 35 Files src app app.component.css app.component.html app.component.ts app.module.ts hello.component.ts infinite-scroll-list.component.ts index.html main.ts polyfills.ts styles.css angular.json package.json Dependencies The full code for this tutorial can be found on this link. Next, we we call a method observe() on this observer only if the current