Examples
HTML Custom Component
Implementing a Custom Component
HTML custom component uses custom elements for reusable widgets.
Introduction to HTML Custom Components
HTML custom components allow you to create custom elements that can be reused throughout your web application. By defining your own HTML tags, you can encapsulate functionality and style, making your code more modular and maintainable. Custom components are a part of the Web Components standard, which includes Shadow DOM, Templates, and ES Modules.
Creating a Basic Custom Element
To create a custom element, you need to define a class that extends HTMLElement. Then, you register this element with a unique tag name using the customElements.define method. Let's look at a simple example:
Using Your Custom Element
Once you have defined and registered your custom element, you can use it in your HTML just like any standard element:
Adding Styles to Custom Elements
Custom elements can have styles encapsulated within their shadow DOM, ensuring that styles do not leak out or get affected by the page's external styles. Here's how you can add styles to your custom component:
Passing Attributes to Custom Elements
Custom elements can accept attributes, allowing you to pass data. You can observe attribute changes using the attributeChangedCallback method. Here's an example:
Conclusion
HTML custom components are a powerful feature that enables developers to create reusable, encapsulated elements. By utilizing the Web Components standard, you can enhance your web applications with modular components that are easy to manage and maintain.
Examples
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