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Change the favicon's fill color depending on the user's system appearance
React Hooks Handbook
1
Intro to React Hooks
3:39
2
Create your first React app
4:23
3
React Component
2:54
4
Styling in React
5:06
5
Styles and Props
2:22
6
Understanding Hooks
3:21
7
useState Hook
2:54
8
useEffect Hook
3:41
9
useRef Hook
3:00
10
Props
3:11
11
Conditional Rendering
4:21
12
Load Local Data
4:04
13
Fetch Data from an API
5:40
14
Toggle a state
4:05
15
useInput Hook
6:04
16
Gatsby and React
6:44
17
NextJS and React
5:24
18
React TypeScript Part 1
8:19
19
React TypeScript Part 2
7:35
20
useScrollPosition Hook
4:26
21
useOnScreen hook
8:08
22
useContext Hook
8:32
23
Fragments
2:43
24
Lazy Loading
4:05
25
React Suspense
3:13
26
Environment Variables
4:43
27
Reach Router
5:31
28
URL Params
4:04
29
SEO and Metadata
6:47
30
Favicon
3:03
31
Dynamic Favicon
2:14
32
PropTypes
3:54
33
Custom PropTypes
3:58
34
useMemo Hook
4:05
35
forwardRef Hook
3:28
36
Handling Events
5:44
37
Spread attributes
3:35
38
useMousePosition Hook
4:55
39
useReducer with useContext Part 1
7:33
40
useReducer with useContext Part 2
6:48
41
useReducer with useContext Part 3
5:43
42
Netlify
5:08
43
Gatsby Cloud
6:19
44
Gatsby Plugin Image
8:11
45
useOnClickOutside Hook
6:32
46
useWindowSize Hook
4:14
47
usePageBottom hook
4:48
48
useLocalStorage Hook
5:27
49
Three.js in React Part 1
17:33
50
Three.js in React Part 2
11:18
Create an SVG icon
First, create an SVG vector icon. This will allow us to toggle the fill color between dark and light mode. It's super easy to create an icon in Figma, and we can export it to SVG.
In my case, I have a pen in light grey and I'll export it as SVG. You can also find this pen in the the source files of this section. We'll be using code to toggle its fill color depending on the system's appearance.
Change the fill color
Once you exported the SVG file, add it into your React project, as a favicon. Learn how to add a favicon to your React application in the Favicon tutorial of this handbook.
Then, open the SVG file. Since SVG is just code, we can directly edit it in order to change the fill color, depending on the color scheme of the system. Right after the svg tag, add the following code. This will fill the icon with black in light mode, and white in dark mode.
<style>
path {
fill: #000000;
}
@media (prefers-color-scheme: dark) {
path {
fill: #ffffff;
}
}
</style>Final SVG code
Find below the final code for the SVG file, including the fill color toggle depending on the color scheme.
<svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
<style>
path {
fill: #000000;
}
@media (prefers-color-scheme: dark) {
path {
fill: #ffffff;
}
}
</style>
<path fill-rule="evenodd" clip-rule="evenodd" d="M8.01047 19.5201L21.2705 6.27012C22.2505 5.29012 22.2505 3.71012 21.2705 2.73012C20.2905 1.75012 18.7105 1.75012 17.7305 2.73012L4.48047 15.9901L8.01047 19.5201Z" fill="white" fill-opacity="0.6"/>
<path fill-rule="evenodd" clip-rule="evenodd" d="M4.48 15.9902L2 22.0002L8.01 19.5202L4.48 15.9902Z" fill="white" fill-opacity="0.3"/>
</svg>Test out your code
Finally, test your code! Set your computer's appearance to dark mode, and see if the favicon's fill color is white.
Then set your computer's appearance to light mode, and see if the icon has been updated with a darker pen.
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Video files, ePub and subtitles
react-hooks-handbook-dynamic-favicon
1
Intro to React Hooks
An overview of React Hooks and the frameworks you can use to build your React application blazingly fast
3:39
2
Create your first React app
Create your first React project from the Terminal and save it on your local computer
4:23
3
React Component
Create your first JSX component using React
2:54
4
Styling in React
How to style your React components using inline styling, separate stylesheets or styled-components
5:06
5
Styles and Props
Render different styles depending on different properties passed to your component
2:22
6
Understanding Hooks
Learn about the basics of React Hooks, which introduced at React Conf 2018
3:21
7
useState Hook
Use the useState hook to manage local state in your React component
2:54
8
useEffect Hook
Manage with your component's lifecycle with the useEffect hook
3:41
9
useRef Hook
Learn about the useRef hook, which replaces the JavaScript getElementById way
3:00
10
Props
Learn about props in React to pass data from parent to child components
3:11
11
Conditional Rendering
Render different UIs depending on different conditions and states
4:21
12
Load Local Data
Load local JSON data into your React application
4:04
13
Fetch Data from an API
Learn the basics of asynchronous functions and promises by fetching data from an API using fetch, useEffect and useState
5:40
14
Toggle a state
Learn how to toggle a state from true to false and back again
4:05
15
useInput Hook
Create a hook to get the value and the onChange event of input fields
6:04
16
Gatsby and React
Create a static content-oriented website using React on Gatsby
6:44
17
NextJS and React
Create your first NextJS React application
5:24
18
React TypeScript Part 1
Learn how to create a React TypeScript application using the Create React App, Gatsby and NextJS methods
8:19
19
React TypeScript Part 2
Learn the basics of TypeScript and how to use TypeScript in a React component
7:35
20
useScrollPosition Hook
Create a custom hook to listen to the current window position of the user
4:26
21
useOnScreen hook
Create a custom hook to listen to when an element is visible on screen
8:08
22
useContext Hook
Manage global states throughout the entire application
8:32
23
Fragments
Group multiple children together with React Fragments
2:43
24
Lazy Loading
Lazy Load heavy components to improve performance
4:05
25
React Suspense
Wait for data with React Suspense and React.lazy
3:13
26
Environment Variables
Make environment variables secret with a .env file
4:43
27
Reach Router
Create a multiple-pages React application with Reach Router
5:31
28
URL Params
Create unique URL with URL Params
4:04
29
SEO and Metadata
Optimize a React application for search engines with React Helmet
6:47
30
Favicon
Add an icon to a React website
3:03
31
Dynamic Favicon
Change the favicon's fill color depending on the user's system appearance
2:14
32
PropTypes
Implement props type-checking with PropTypes
3:54
33
Custom PropTypes
Create a custom PropType using a validator function
3:58
34
useMemo Hook
Prevent unnecessary re-renders when the component stays the same
4:05
35
forwardRef Hook
Forward a ref to a child component
3:28
36
Handling Events
How to handle events in React
5:44
37
Spread attributes
Learn how to make use of the spread operator
3:35
38
useMousePosition Hook
Detect the user's mouse position on a bound element
4:55
39
useReducer with useContext Part 1
Create a reducer to be used in a context
7:33
40
useReducer with useContext Part 2
Incorporate useReducer with useContext
6:48
41
useReducer with useContext Part 3
Connect the context and reducer with the frontend
5:43
42
Netlify
Deploy to production using Netlify
5:08
43
Gatsby Cloud
Deploy to production using Gatsby Cloud
6:19
44
Gatsby Plugin Image
Use gatsby-plugin-image for automatic image resizing, formatting, and higher performance
8:11
45
useOnClickOutside Hook
Toggle a modal visibility with a useOnClickOutside hook
6:32
46
useWindowSize Hook
Create a hook to determine the width and height of the window
4:14
47
usePageBottom hook
Detect if the user scrolled to the bottom of the page
4:48
48
useLocalStorage Hook
Store an item in a browser's local storage
5:27
49
Three.js in React Part 1
Bring your website to life with beautiful 3D objects
17:33
50
Three.js in React Part 2
Bring your website to life with beautiful 3D objects
11:18
Meet the instructor
We all try to be consistent with our way of teaching step-by-step, providing source files and prioritizing design in our courses.
Stephanie Diep
iOS and Web developer
Developing web and mobile applications while learning new techniques everyday
7 courses - 36 hours
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Advanced React Hooks Handbook
An extensive series of tutorials covering advanced topics related to React hooks, with a main focus on backend and logic to take your React skills to the next level
3 hrs
SwiftUI Concurrency
Concurrency, swipe actions, search feature, AttributedStrings and accessibility were concepts discussed at WWDC21. This course explores all these topics, in addition to data hosting in Contentful and data fetching using Apollo GraphQL
3 hrs
SwiftUI Combine and Data
Learn about Combine, the MVVM architecture, data, notifications and performance hands-on by creating a beautiful SwiftUI application
3 hrs
SwiftUI Advanced Handbook
An extensive series of tutorials covering advanced topics related to SwiftUI, with a main focus on backend and logic to take your SwiftUI skills to the next level
4 hrs
React Hooks Handbook
An exhaustive catalog of React tutorials covering hooks, styling and some more advanced topics
5 hrs
SwiftUI Handbook
A comprehensive series of tutorials covering Xcode, SwiftUI and all the layout and development techniques
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