when to use web components
A warm cup of tea in my hand, about to sip it, but the phone suddenly rings. Usually Web Components creation and manipulation will be done internally by your framework of choice. No additional dependencies. Web components are also an example of it…. recent versions of Google Chrome, Mozilla Firefox, Safari or Microsoft Edge, based on Chromium). Web Components and Web Design. So my advice is to choose wisely and maybe stick with one or two Webcomponent „vendors“, e.g. Of course, if you don’t have any problems using NodeJS, NPM etc. There is no such thing. Moreover, they weren't forced to use explicitly Web Components for their individual applications later on, but would be able to consume the components in their React or Angular applications. to integrate a standard CSS framework (I’ve used Bulma) into it: There are various Open-Source Web Components available, a lot of them by really „big players“ like Google, SAP or Vaadin which you can integrate into your own Web Components project. Web Components are a set of features that provide a standard component model for the Web allowing for encapsulation and interoperability of individual HTML elements. A Developer's Motivation, JavaScript Async Code - Callbacks, Promises, Async/Await, AWS for Beginners: Hosting Frontend Production on AWS, Web Components: When, Where, and Why to Use Them, Stencil.js vs lit-element vs Vanilla vs Shadow DOM vs Vue.js What is the best solution for Web component. And while they may not replace your framework of choice, they can be used alongside them to augment you and your organization’s workflows. Please note that a dash is obligatory in the identifier of your components to distinguish them from „official“ DOM elements! Or you can just manually look for updates if you are only using a handful of external dependencies. The Shadow DOM basically isolates your Web Components from the surrounding DOM to prevent any side effects from other Javascript or CSS on the page. However, SSR of Web Components can actually be accomplished by pre-rendering Web Components and re-hydrating on the client, and this can even work across shadow roots! Use the familiar ES Classes syntax to write custom elements and declare the data and attributes of the custom elements. if you need a grid view and a date picker, use both from the same vendor if possible. In this article, I provide a basic understanding of what web components are and how to use them. Web Components. We’ll be building 3 components. I’m really excited about this one, and they’re looking for contributors… :) elix/elix. It is very efficient and supports partial DOM caching, variables, expressions and control structures and works in all major browsers. It is more readable, and it is only a simple counter. with all those node_modules dependencies etc., you can skip the rest of this chapter and just go the „traditional“ way :) So, e.g. Then you can just copy that generated (and probably minified) file into your main project and use it directly. Of course, there are some features you need to implement yourself or find some library that does the job for you. You can also check out the next post about attributes. A web component can also expose custom attributes that can be later used to customize the element and for setting the element’s behavior. Web Components and WTF is Shadow DOM? Web Components. As mentioned above, you can also import your components from external JS files of course. Web components are a set of web platform APIs that allow you to create new custom, reusable, encapsulated HTML tags to use in web pages and web apps. We can create a component library or use mono repo to share them. Robin Rendle on Jun 25, 2019 . I could do the copy paste work here, but I’m lazier than that, and the article would be even longer…. Web Components themselves work fine, but by default React passes all data to Custom Elements in the form of attributes, meaning you can’t pass objects or arrays without workarounds. With a SharePoint-hosted add-in, you can only use XML markup to update an add-in, and there are some limits on how you But as enjoyable as it is to have a „KISS“ setup, with every component directly included as (mostly one) „plain“ JS and CSS file, without having maybe hundreds or even thousands of subfolders inside your famous „node_modules“ folder and without the need to handle advanced Webpack configurations or the like, of course there can be some gotchas or disadvantages for you. Also checkout the Web Components.org website for a registry of various components. While it is pretty straightforward to include 3rd party components via NPM or YARN (just check the README instructions for the components), I always had a bad feeling to have a 50 to 100MB node_modules folder sitting in my project directory with maybe thousands of external dependencies. Try to keep it as simple as possible - Treat them as components with styles or as a container. Web Components work across modern browsers and can be used with any JavaScript library or framework that utilizes HTML. The two goals are complementary. Stencil … Here is an example for the Vaadin grid component, installed with NPM in a separate folder and processed with RollupJS: After that, you get a single, minified JS file with all dependencies „compiled“ into which you can copy into your project and import it directly, without even using NodeJS /NPM / YARN in your main project at all: If you use the RollupJS plugin-multi-entry plugin, you can even bundle more than one input file into one output file, e.g. If you are familiar with building components in libraries like React or Angular , Web Components should feel similar. But if you use Shadow DOM (or Shadow CSS for that matter), no external, colliding styles will be applied to your components inner DOM and it should always look as expected. Whatever you do, you should think about it before you choose to go that path. Select your preferred language. Of course, anytime you want to update the external component, you can (and have to) do so and re-bundle it with RollupJS. For instance, you cannot use React components in an Angular application, and vice versa. – Ole 17 mins ago I mean.. if you check the actual generated file, the content from the webcomponent is probably there.. but if you request that index file, angular kicks in and replaces the DOM, probably removing it. the Vaadin Grid Component, the SAP UI5 Datepicker Component, the Prime Elements MegaMenu Component, etc. We had an internal app made in Angular ( ver. This article tries to summarize all the knowledge I have about Web Components: when, where, and why to use them? Use them as a helper which can boost the process of development, or at least skip a process of designing new UI components. The content is likely still applicable for all Angular 2 + versions. Further they way you construct html in Shadow DOM seems to be different to Light DOM. Angular has been designed from the ground up to work with Web Components. Web Components provide strong encapsulation for reusable components, while React provides a declarative library that keeps the DOM in sync with your data. Step-by-step instructions on how to wrap a React component inside a framework-agnostic HTML custom element; how to expose its properties and events, and support children transclusion. If you want to style the root element itself, e.g. Web Components are a set of web platform APIs that allow you to create new custom, reusable, encapsulated HTML tags to use in web pages and web apps. And there is a Bootstrap port for React. If you are developing a product that needs to work in IE, do not use web components. Features, built on the Web Component standards, can be used with (or without) any JavaScript library or framework (i.e. You can use ES2015 style modules and import statements (with ‚type=“module“‚) to do so, e.g. Now we need to install a Web Component. Web Components are generally available in all of the major browsers with the exception of Microsoft Edge and Internet Explorer 11, but polyfills exist to fill in those gaps. Of course, building more sophisticated components like this quickly becomes cumbersome. and your script would look exactly the same like in the above example: You can style your components „internally“, but you can also open them up for styling from outside, wether you are using Shadow DOM or not. For a simple router, check out this. To be on the same page with everyone I’m not saying that we should drop our frameworks/libraries and start writing everything with the help of Web Components (well that is possible to be done). The two goals are complementary. For more: https://custom-elements-everywhere.com/, Why Do People Make Open Source Software? As you can see, it is really easy to get started with Web Components, you can literally use one HTML file and play with it in your browser. As described in my rollup setup above, I had a problem with at first bundling the Vaadin Grid to use it in my project as an import, and then „re-bundle“ it for a minified release of the whole project. And there is a Bootstrap port for React. It should only know about self behavior, but there are exceptions which lead to the second rule: If they need to control, they need to control only other known Web Components: Instead of creating 12345th prop inside Component, create. If you choose not to use NodeJS / NPM / YARN in your main project and instead „rollup“ the external components to import them manually, you may have to implement something to update those libraries, e.g. Additionally, because React has its own synthetic event system, it cannot listen for DOM events coming from Custom Elements without the use of refs. Without Shadow DOM, one could still overwrite styles of the component by using ids or classes for the Webcomponent base DOM element or just by more globally defined modifiers on the page („style creep“). Learn Development at Frontend Masters. Custom components and widgets built on the Web Component standards, will work across modern browsers, and can be used with any JavaScript library or framework that works with HTML. That’s it. You could ask yourself a question: Why do I or my organization need a Web Components? For basic data binding e.g., check out this article. What’s really cool though is the RollupJS Visualizer plugin, which generates a HTML report of the package content and file sizes etc. an old AngularJS app you surely know what I mean): just like with HTML, you basically rely on web standards that will likely be around for at least a couple of years, so you should be safe from regular, painful framework updates, breaking changes, broken dependencies etc. For a thorough introduction, refer to Web Components’ official webpage. There are also some JS frameworks which can generate Web Components, but I am pretty sure that in the not too distant future, there will be less and less Javascript frameworks – and standard Web Components will be used all over the place. This makes working with Custom Elements cumbersome. 4 Polyfills) Also agree (see point 1). there is no two-way data binding as in Vue or Angular, there is no default router, etc. Three Technologies Used in Web Components. You could e.g. You don’t even need NPM or YARN if you don’t want to. To demonstrate Web Components in React, we will use the Create React App CLI tool to easily create a React application. - yeah you are right if you have one technology there is no point of using Web Components, I completely agree with that, but that can change. After it, we created the Web components library, used it in the new React app, and switched in Angular one for design consistency, and for Future CTO decision changes. This will save you quite some kilobytes, because they probably share some base functionality and CSS classes. Well yes, you could do that, but you should keep in mind, although those components are indeed standalone components which can be combined quite easily, most of the time they will probably include other „base“ components or quite some bootstrap code for the general functionality as well as maybe lots of CSS definitions for the layout etc. Web components have a standard way of creating components that use HTML and DOM API that every other front end framework uses and a common way of receiving and sending data using props and events. E.g. set up a separate „libs“ project with NPM, update that, auto-run your rollup process and copy/deploy the generated files to your „plain“ project. You can use e.g. Brouillon Cette page n'est pas terminée. So I ended up adding it as a separate file to my project bundle in the end. Web components are a set of web platform APIs that allow you to create new custom, reusable, encapsulated HTML tags to use in web pages and web apps. Server side rendering and progressive enhancement. Primary technologies used to create them include: Custom Elements: APIs to define new HTML elements; Shadow DOM: encapsulated DOM and styling, with composition LitHTML is a very small and lightweight Javascript template library you can use inside your components. What we’ll build. The ability to create fully customized and reusable elements is what attracted me to Polymer and the concept of web components. Web components are a set of web platform APIs that allow you to create new custom, reusable, encapsulated HTML tags to use in web pages and web apps. We have too many similar components in our web page that fall under the same semantic structure. I will show you some that I have encountered in my first Web Components projects. As developers, we all know that reusing code as much as possible is a good idea. Web Components is a bundle of new standards that allow developers to build their own DOM elements. Vue.js is an effective tool for creating web components, especially with Vue CLI 3 and the new @vue/web-component-wrapper. To answer the second question I copied the description from its page: The stencil is a compiler that generates Web Components (more specifically, Custom Elements) and builds high-performance web apps. As a developer, you are free to use React in your Web Components, or to use Web Components in React… Probably the two most-used funtions of LitHTML are „html“ and „render“: LitHTML has a lot more features, though! Angular, React and Vue) and will work across all modern browsers. Stencil combines the best concepts of the most popular frameworks into a simple build-time tool. https://www.webcomponents.org/introduction, https://benfarrell.com/2019/09/22/why-web-components-now/, https://www.npmjs.com/package/@ui5/webcomponents, https://lit-html.polymer-project.org/guide/template-reference, https://github.com/rollup/plugins/tree/master/packages/node-resolve, https://www.npmjs.com/package/rollup-plugin-visualizer, https://css-tricks.com/making-web-components-for-different-contexts/, https://codepen.io/equinusocio/pen/vMOqBO, https://medium.com/swlh/https-medium-com-drmoerkerke-data-binding-for-web-components-in-just-a-few-lines-of-code-33f0a46943b3, https://github.com/filipbech/element-router, https://vaadin.com/blog/responsive-design-made-easy-with-css-grid-and-web-components, https://developer.mozilla.org/en-US/docs/Web/Web_Components/Using_shadow_DOM, https://developer.mozilla.org/de/docs/Web/Web_Components, all major browser vendors are supporting them, there are already loads of components available, commercial and open source, stable and predictable lifetime – no upgrade traps, no breaking changes, you can combine components from different vendors, no preset styling – you can choose any CSS framework or roll your own styles, polyfills available if you really need to support older browsers. If you really need to support older browsers, e.g. Native Web Components provide a lot benefits: Declaration: You can easily declare components on your page that are ready to go; Composability: You can compose applications using smaller chunks of code, with the Shadow DOM; Reusability: You can import, use and reuse elements in applications; Maintainability: Compartmentalized, reusable code is the best way to maintain code … The idea is to have a really simplistic, plain HTML/JS/CSS project which you can run with e.g. How to use UI5 Web Components. With Shadow DOM you need to use
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