But this is a separate request, there may have been changes to the data in the time between rendering the page, getting it to the client and the client parsing and running the script. This article will continue on from my previous post, where we implemented basic server side rendering.Now we will add hydration. In the context of client-side frameworks, this means making server-side rendered HTML interactive without completely re-rendering it from scratch. Data Pre-Fetching and State Instead, we want to “hydrate” the static markup and make it interactive. Rehydration in isomorphic web apps involves re-generating state client-side used to render a page on the server. Server side rendering (SSR) is one of those things that’s long been touted as one of the greatest strengths of React, Angular 2+, and Vue 2.It allows you to render your apps on the server, then hydrate them with client side reactivity after the page loads, greatly increasing the responsiveness and improving the load time of your pages. To ensure correct matching, make sure to write valid HTML in your templates. The source code is available here. I would like to understand what is the best way to debug this error? Simple, tiny, client-side hydration of pre-rendered Vue.js apps. If the application relies on an external resource, for example data retreived from an external endpoint, the data needs to be fetched and resolved before we call renderer.renderToString. One pain point of current mainstream server rendering implementations, such as React’s, is that the rendering is synchronous so it can block the server’s event loop if the app is complex. Quench Vue logo. Vue.js is a framework for building client-side applications. Usually by reloading the page. All of these will need their own validations. Quench Vue: Client-side hydration of pre-rendered Vue.js apps Quench Vue. In production mode, this assertion is disabled for maximum performance. Now, when breakpoint is hit, execution should stop in the hydrate function. If there is a mismatch, it will bail hydration, discard existing DOM and render from scratch. Please read through this guide for a summary of Vue hydration. I love building isomorphic javascript and think it is the way of the future. from. Now we will add hydration. By running yarn build:server && yarn build:client, the client build was using cached components from the server build, then there was no render function, because ssr build produces ssrRender function only. vue.runtime.esm.js:430 [Vue warn]: The client-side rendered virtual DOM tree is not matching server-rendered content. Only the current page's metadata is sent. This article will continue on from my post, setting up weback for ssr with Vue, where we implemented basic server side rendering. But there is still one issue i would like to solve. Bailing hydration and performing full client-side render. Warmth and Sunshine, ~ Ben. Write server-side, (or even client-side), conditional code to load it. vue.runtime.esm.js:619 In summary, the Vue.js client renderer seems to expect a Vue.js server renderer and has little tolerance. We also need to worry about Client Side Hydration, Build Configuration, Caching and many more, which are all in some part covered in the official Vue SSR Guide. I have finally found out that cache-loader was causing my issue. In the worst case, this can cause the entire application to re-render in the client in order for React to guarantee the client-side application is in the correct state. If there is a mismatch, it will bail hydration, discard existing DOM and render from scratch. Finally, we’ll retrieve some highly dynamic repo info (such as number of stars and forks) from the GitHub API, and with the help of Vue’s awesome client-side hydration features, display it in each repo’s page. Vue + webpack | npmjs.com. Note that it didn't add id="app", just the data-server-rendered attribute: you need to add the ID or some other selector to the app's root element yourself or the app won't hydrate properly. First, start with the shared word: Hydration. Client Side Hydration Hydration refers to the client-side process during which Vue takes over the static HTML sent by the server and turns it into dynamic DOM that can react to client-side data changes. Once the hydration happens (which means Vue is taking control over server-side rendered HTML) the components are picking up the server-side state from this object. Vue 3 Hydration refers to the client-side process during which Vue takes over the static HTML sent by the server and turns it into dynamic DOM that can react to client-side data changes. With the migration to virtual-DOM, Vue 2.0 naturally supports server-side rendering with client-side hydration. To make client side hydration work, we have to. These hydration warnings are, in my view, a big deal but are so easily overlooked. Hydration refers to the client-side process during which Vue takes over the static HTML sent by the server and turns it into dynamic DOM that can react to … If you inspect the server-rendered output, you will notice that the app's root element has had a special attribute added: The data-server-rendered special attribute lets the client-side Vue know that the markup is rendered by the server and it should mount in hydration mode. Click at the source location hyperlink of the warning in vue.runtime.esm.js. That is Vue's recommended approach for server-side rendering, but it is not strictly necessary for static sites because the major difference between createApp () … →, // this assumes App.vue template root element has `id="app"`. For example, when you write this in a Vue template: The browser will automatically inject inside , however, the virtual DOM generated by Vue does not contain , so it will cause a mismatch. These keys are available only on client-side. First, our App component will only render the Register component: The script section will look like this: For the Register component we want to show a form with inputs fields: The .preventmethod is used to stop the default behavior of the form when a submission is made. I've fixed it by disabling cache-loader at chainWebpack function in vue.config.js. Client-side keys. Server Side Rendering - SSR support with component level caching and client-side hydration provides another boost to performance and allows for extremely fast rendering. Nuxt is using this object to convey the data obtained on the server side to the client side. By default, Vue components produce and manipulate DOM in the browser as output. Make the same warning appear again. If you do receive hydration errors (as seen in console: “Vuejs Error - The client-side rendered virtual DOM tree is not matching server-rendered content”), you can try following these steps: Copyright © 2015 - 2020 PULSARDEV SRL, Razvan Stoenescu. I am not going to talk about what is hydration, to know more about client-side rendering, server-side rendering and hydration, please read this amazing article by Jason Miller and Addy Osmani. Fortunately, thanks to the amazing vue-lazy-hydration library made by Markus Oberlehner we can do a lot! It's great for when you can't/don't want to use "real" server-side rendering. Since the server has already rendered the markup, we obviously do not want to throw that away and re-create all the DOM elements. To ensure correct matching, make sure to write valid HTML in your templates. Vue 3 tree-shaking + Rollup code splitting; Does not ship metadata for every page on every request. If there are many warnings, you can check the message by moving a mouse over, When you have found your message and stopped on a breakpoint, look at the, In the hydrate function, move about 15 lines from the start and set a breakpoint where false is returned after, Make the same warning happen again. As we can read in the libraries README: "vue-lazy-hydration is a renderless Vue.js component to improve Estimated Input Latency and Time to Interactive of server-side rendered Vue.js applications.” Exactly what we’re looking for! I tested disabling AutoMin for the test site, which resulted in a functioning application, verifying this was the issue. Introducing Bundle Renderer From my experience, one of the most error-prone topics is the process of Client Side Hydration. In development mode, Vue will assert the client-side generated virtual DOM tree matches the DOM structure rendered from the server. ← If the application relies on an external resource, for example data retreived from an external endpoint, the data needs to be fetched and resolved before we call renderer.renderToString.. Server-side sends a fully rendered page to the client; the client's JavaScript bundle takes over which then allows the Vue.js app to hydrate. Hydration refers to the client-side process during which Vue takes over the static HTML sent by the server and turns it into dynamic DOM that can react to client-side data changes. In entry-client.js, we are simply mounting the app with this line: nuxtState. nuxtState (Object) Nuxt state, useful for plugins which uses beforeNuxtRender to get the nuxt state on client-side before hydration. This does not work well with Vector's PHP implementation and the confounding factors identified above. Bailing hydration and performing full client-side render. I have a Vue.js App working with Server Side Rendering (SSR) and then client side hydration and it works great. Streaming Server-side Rendering. Hydration refers to the client-side process during which Vue takes over the static HTML sent by the server and turns it into dynamic DOM that can react to client-side data changes. Client Side Hydration | Vue SSR Guide (vuejs.org) [SOLUTION] My solution was to get up and running with ESlint, and found that using the --fix argument made resolving this issue a breeze. If Vue is expecting a different markup compared to the rendered HTML, the hydration will fail (also called “Vue will bail hydration”). This decouples page weight from total number of pages. Standard client side rendered sites would make a http request to the backend api to get the data on initial mount. It's great for when you can't/don't want to use "real" server-side rendering. # Client Side Hydration Hydration refers to the client-side process during which Vue takes over the static HTML sent by the server and turns it into dynamic DOM that can react to client-side data changes. The client-side rendered virtual DOM tree is not matching server-rendered content. In web development, hydration or rehydration is a technique in which client-side JavaScript converts a static HTML web page, delivered either through static hosting or server-side rendering, into a dynamic web page by attaching event handlers to the HTML elements. This is likely caused by incorrect HTML markup, for example nesting block-level elements inside

, or missing

. After rendering HTML, hydration is processing inline JSON state stores client-side (e.g Redux state) for data already in the page and attaching DOM event listeners for the experience. You can read more in the official Vue SSR docs about it. Hydration is the process where Vue is transforming server-side rendered markup and makes it reactive so it can reflect dynamic changes from Vue. Quench Vue allows server-rendered/static markup to be used as the data and template for a Vue.js app. The difference in the data could break hydration. React Partial Hydration; References; Disclaimer.