How do you use custom elements and slots with other web frameworks and libraries?

1 What are custom elements and slots?

Custom elements are a way of defining your own HTML tags with custom behavior and appearance. They are based on the Web Components standard, which also includes shadow DOM and templates. Custom elements can extend existing HTML elements or create new ones from scratch. They can also expose attributes, methods, and events for interaction. Slots are a feature of shadow DOM that allow you to insert content from the main document into specific places inside a custom element. Slots can be named or default, and can accept multiple or single nodes. Slots can also be dynamically updated with JavaScript.

3 How to create custom elements and slots?

To create a custom element, you need to define a class that extends the HTMLElement interface, and register it with the customElements.define() method. You can also use the constructor, connectedCallback, disconnectedCallback, attributeChangedCallback, and adoptedCallback lifecycle methods to initialize and manage your element. To use slots, you need to create a shadow root for your element with the attachShadow() method, and add a <slot> element inside your shadow DOM template. You can also use the slotchange event to react to changes in the slotted content.

4 How to use custom elements and slots with React?

React is a popular library for building user interfaces with components. It utilizes a virtual DOM to manage the state and rendering of the components, and JSX to write HTML-like syntax. To use custom elements and slots with React, you must use the customElements.define() method to register your custom element before rendering your React app. Additionally, you must use the React.createElement() method or the JSX syntax to create instances of your custom element in your React components. Furthermore, you must use the ref attribute or the useRef hook to access the custom element's properties and methods from your React component. Lastly, you must use the children prop or the React.Children API to pass content to the slots of your custom element from your React component.

5 How to use custom elements and slots with Angular?

Angular is a framework for building single-page applications with components. It uses TypeScript to write type-safe and declarative code, and decorators and templates to define and render the components. To use custom elements and slots with Angular, you need to use the @angular/elements package to create and register your custom element with the createCustomElement() and customElements.define() methods. Additionally, you must use the ng-content directive to create slots in your Angular component template and assign names to the slots with the select attribute. To render your Angular app, you can use the <app-root> element or the bootstrap option. Finally, you can use the standard HTML syntax to create instances of your custom element and pass content to the slots in your main document.

6 How to use custom elements and slots with Vue?

Vue is a framework for building reactive and composable user interfaces with components. It uses a template syntax to write HTML-like code and options and lifecycle hooks to define and manage components. To use custom elements and slots with Vue, you need to use the Vue.customElement() method from the vue-custom-element plugin to create and register your custom element from a Vue component. Additionally, you should use the <slot> element to create slots in your Vue component template, and assign names to the slots with the name attribute. To render your Vue app, use the <div id="app"> element or the el option in your main document. Finally, use the standard HTML syntax to create instances of your custom element and pass content to the slots in your main document.

7 Here’s what else to consider

This is a space to share examples, stories, or insights that don’t fit into any of the previous sections. What else would you like to add?