What are web elements
What are Web Components?
- HTML templates: Mark-up templates that are not shown on the displayed page and can be used as the basis for user-defined elements
Why should you use Web Components?
Since the universal web elements are separated by a simple, easy-to-learn syntax program beginners will also benefit from the W3C standard. In recent years, Google has been working on the "Polymer Project" Libraries and templates for programming web components to be developed and freely available.
An overview of the Web Components
The Web Components model is basically based on four specifications, which we will discuss in more detail below. We also give some concrete examples of the Web Components specifications.
Custom elements are HTML tags that encapsulate the content of HTML, including CSS instructions and scripts. You will be in the CustomElementRegistry declared. Their main characteristics are:
- They end with a closing day.
- Its name is a DOM string and always contains a hyphen.
- Your name may only appear once within the CustomElementRegistry.
In order to be able to use this element in a web application, the following code is sufficient:
The most important property of Web Components is their ability to encapsulate HTML elements. The Shadow DOM API helps you by allowing you to attach hidden DOM trees to a document tree. Only the HTML tag of the shadow DOM is visible. This allows you to add HTML elements to the hidden DOM without having to change the main DOM every time. You can find more detailed information about this technique as well as specific application examples in our article about shadow doms and how they work.
Via import you can now call the exported function as often as you like.
With the day <template> define an HTML template. In the following example you create a template called "My Element".
How do I use Web Components?
The presented examples for Web Components only work if you combine the individual parts of the Web Components model with one another. The following scheme shows the procedure in a simplified manner:
- Declare your new custom element with the method CustomElementRegistry.define ().
- If necessary or desired, attach a hidden shadow DOM to add child elements to your custom element.
- Define an HTML template with the tags <template> and
- Use the generated custom element within your website like a normal one HTML element.
The following tutorial offers you a simple introduction to programming Web Components:
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Compatibility of Web Components with the various browser versions
The compatibility of Web Components was not given in earlier browser versions. In the meantime, however, all common browsers support Custom Elements, Shadow DOM, ES Modules and HTML templates. The following table provides an overview of the compatibility of the various web components.
|Custom elements||Yes||Yes||Yes (from version 76)||Yes||Yes|
|Shadow DOM||Yes||Yes||Yes (from version 75)||Yes||Yes|
Web Component Libraries, Templates, and Samples
Programming Web Components can be complicated, especially as a beginner. However, you can find numerous on the web Libraries with templates and standard functions as well as practical examples of Web Components to make your work easier.
- Lit Element: simple basic class for creating web components
- Hybrids: Provides a simple UI library for creating web components
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