October 30, 2023
Understanding the basics of a toggle button
A toggle button typically represents a binary option in the UI, displaying the current state and allowing the user to change it with a click or tap. Visually, it might show text, icons, or colors to denote the different states.
Creating the HTML structure
The foundation of a toggle button is a simple HTML element that can be clicked, such as a button or a custom div. Here's a basic example:
Styling with CSS
Use CSS to give the button a visual representation of its state. You may use pseudo-classes or class toggling to change styles.
You need to add an event listener to the button that will change its state each time it's clicked. The
DOMContentLoaded event ensures that the script runs after the initial HTML document has been completely loaded and parsed, without waiting for stylesheets, images, and subframes to finish loading.
classList.toggle function is a part of the ClassList API and is a convenient way to add or remove a class from an element's list of classes. If the class is present, it gets removed; if not, it gets added.
Accessibility is crucial, so ensure that the button has the appropriate ARIA attributes to represent its state. For instance, the
aria-pressed attribute indicates the current state of the toggle button to assistive technologies.
And update the
Keyboard navigation and screen reader support
To make your toggle button fully accessible, ensure that it can be operated with the keyboard. Typically, toggle actions should be bound to the
Enter key presses.
Also, provide instructions for screen reader users if necessary, using
Creating a controlled component
For frameworks like React, you would control the toggle button with state and props, updating the visual component based on changes to the state.
Handling toggle events
Sometimes you need to do more than just change the appearance of the button. For instance, you might need to make an API call when the toggle state changes.
When implementing the API call or operation, it's crucial to handle errors gracefully. Consider wrapping your API call in a try-catch block or using
.catch with promises.
To keep the toggle state persistent across page reloads, you can use the Web Storage API.
If you have a dynamic list of toggle buttons, use event delegation to minimize the number of event listeners and handle events more efficiently.
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