tab

@oom/tab

Tab panel component with the following features:

• No dependencies
• Light: Aprox 200 lines of code (including comments and spaces)
• Follows the progressive enhancement strategy:
  • Works with just html
  • Works better with html and css
  • Works much better with html, css and js
  • Works much much better when js polyfills are not needed
• No styles or themes are provided with this package. You decide how the tabs must look.
• Support for touch devices
• Support for keyboard
• Fully accessible
• Build with modern javascript, using ES6 modules and custom elements

Install

Requirements:

• NPM or Yarn to install the package
• For browsers not supporting custom elements, you can use this polyfill

npm install @oom/tab
npm install @webcomponents/custom-elements

Usage

HTML

Let’s start with the following html code:

<my-tabs role="region">
     <ul role="tablist">
        <li role="presentation">
            <a href="#section1" role="tab" id="tab1" aria-selected="true">
                Section 1
            </a>
        </li>
        <li role="presentation">
            <a href="#section2" role="tab" id="tab2">
                Section 2
            </a>
        </li>
        <li role="presentation">
            <a href="#section3" role="tab" id="tab3">
                Section 3
            </a>
        </li>
    </ul>

    <section id="section1" aria-labelledby="tab1" role="tabpanel">
        Content section 1
    </section>

    <section id="section2" aria-labelledby="tab2" role="tabpanel">
        Content section 2
    </section>

    <section id="section3" aria-labelledby="tab3" role="tabpanel">
        Content section 3
    </section>
</my-tabs>

CSS

Use css to define the tab panel appearance:

/* This makes the tabs works without javascript */
section:not(:target) {
    display: none;
}

[role="tablist"] {
    display: flex;
    list-style: none;
    padding: 0;
}

JS

And finally use javascript for a complete experience:

import Tab from "./tab/tab.js";

//Register the custom element
customElements.define("my-tabs", Tab);

API

This is a custom element that extends HtmlElement, so it innerit the same api of a standard html element with the following additions:

//Select the element
const element = document.querySelector("my-tabs");

//Change the tab state
element.setState("#section2");

//Get the currently selected tabpanel element
console.log(element.panel);

//Get the currently selected tab element
console.log(element.tab);

Demo and tests

• Demo: https://oom-components.github.io/tab/demo/
• Tests: https://oom-components.github.io/tab/tests/

To run the demo locally, just clone this repository, enter in the directory and execute:

npm install
npm start

You should see something in the following urls:

• Demo: http://localhost:8080/demo
• Test: http://localhost:8080/tests

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