vuejs lazy load data

The reason why I’m still writing this article is, that I wanted a more lightweight solution. Knowing how dynamic imports are working we know that product and category will end up in a separate bundles but what will happen with productGallery module that wasn’t dynamically imported? In this series, I’ll dig deep into Vue performance optimization techniques that we are using in Vue Storefront and that you can use in your Vue.js applications to make them loading instantly and perform smooth. Link Making an API. Hãy bắt đầu bằng việc tạo một component hiển thị một hình ảnh (đương nhiên là chưa có lazy load gì cả). Take a look at below example: Assuming isModalVisible variable is set to false even though both statements will take the same effect from the user point of view the v-if directive will remove component from the DOM completely while v-show will just add display: none CSS property. This article will outline how to lazy load (dynamically load) VueJS Single File Components. The answer to this question is trivial and intuitive - everything that is not required on initial render. Everything marked as red is something that is not needed on current route and can be lazily loaded. The purpose of lazy loading is to postpone downloading parts of your application that are not needed by the user on the initial page load which ends up in much better loading time. We learned how to use lazy loading with Vue components. This is where dynamic imports can help us! Interesting side note: When you pass a component to components property of Vue instance under the hood it’s checking if passed value type is object or a function. During my daily job I build open source products, interfaces for programmers and engage communities. This is why the trick with v-if works. Lazy loading is one of the best ways to make your web app more performant and reduce the bundle size. The answer is easy — lazy loading and code splitting. The longer a user has to wait, the more likely he is to leave our site. Data Fetching; Scroll Behavior; Lazy Loading Routes. By lazy loading proper components and libraries we managed to cut off the bundle size of Vue Storefront by 60%! To see how much of the JavaScript code is actually used in our website we can go to the devtools -> cmd+shift+p -> type coverage -> hit ‘record’. Instead of magic comments you can use more general solution like webpack prefetch plugin or workbox. Now webpack will bundle the content of the dynamically imported module into a separate file. We’ll call this file ImageItem.vue. Here are the most common ways to invoke dynamic loading of Vue component: Please note that the invocation of lazyComponent function will happen only when component is requested to render in a template. In this article, we will explore which types of components can be loaded lazily and, more importantly, how to handle the waiting required for them to download. Now when you click the button, you will lazy load the GreetComponent inside the parent component. Vue-Lazyload. Lazy Loading Images in VueJs. So it turns out that all we need to do to lazily load any component is combining v-if directive and dynamic import statement like this: Lazy loading components can save a lot of time on initial download, but it comes with a price that the user has to pay later. For those still not convinced if it is worth playing with lazy loading, here’s some raw numbers from the simple example we’ve been using. It’s time to master another area of Vue performance! Prefetching in simple words, is just downloading certain resources that may be needed in a future before they are requested by the browser. It’s called prefetching. This is where we’ll define our API: basi­cal­ly, what data are we return­ing.Our API is incred­i­bly sim­ple, we just want to be able to load the next 9 blog entries. That can result in bad or extremely bad user experience, depending on how long time it takes to download the resource. Now that we know what lazy loading is and why we need it. The good news is that it’s extremely easy and we can lazily load the entire Single File Component, with it’s CSS and HTML with the same syntax as … A simple lazy-load list component based Vue 2.x, which will be on-demand rendering the list based container element's viewport. The navigator object holds information about the browser. It is wasteful at best, to download, parse and execute the entire bundle everything on every page load when only a few parts are needed. …that’s all you need! This usually means everything that the user doesn’t see until he/she interacts with our app in some way. Continuing my dive into the Intersection Observer API, this week I look at probably the most practical use case for them, lazy loading images! Assuming we have a file called main.js specified as an entry point in our webpack config it will be a root of our dependency graph. How cool is this? Passing Data to Lazy-Loaded Component. Async component is basically an object containing: The second property is a great way to deal with browsers that don’t support prefetching while the third one let us deal with error handling in offline-first application in rare cases when the prefetching fails. v2-lazy-list. About; Contact; Write for Us! This example will be using Axios and MomentJS for data fetching and date formatting, respectively. The bigger bundle, the longer it takes to download and parse for our users. Important: Depending on your build configuration prefetching might work only on production mode. Even though this technique will give you a massive size reduction there are still plenty of things that we can lazy load … Bài viết này tôi sẽ cùng bạn tạo một ví dụ lazy loading Image bằng VueJS. Now every js module that we will import in this file will become its node in the graph and every module imported in these nodes will become their nodes. During my daily job I build open source products, interfaces for programmers and engage communities. Learn more in the Directory Structure book in the Components chapter. It provides a set of values which can be used to configure how the image will display: Values. Vue.js - The Progressive JavaScript Framework. That’s probably the easiest way to gain some performance boost. Part 1 — Introduction to performance optimization and lazy loading. On the other hand, lazy loading refers to an approach where all of the scripts are not loaded on the DOM as the application starts, instead, they are only loaded when requested, making the JavaScript bundle size very small at … Part 2 — Lazy loading routes and vendor bundle anti-pattern. ... Lazy loading images can significantly improve page performance because it takes the page weight hogged by images and loads them in only when the user actually needs them. // src/utils/lazy-load-component.js export default function lazyLoadComponent ({ componentFactory , loading , loadingData , }) { let resolveComponent ; return () => ({ // We return a promise to resolve a // component eventually. Vue I18n is internationalization plugin for Vue.js. Learn how to lazy load routes with a free lesson on Vue School. Single-file (.vue) components