How to Prevent White Background Flickering During Dark Mode Reload?
Nov 04, 2024 am 02:58 AM
How to Eliminate White Background Flickering During Dark Mode Reload
When implementing dark mode in an app, it's crucial to address the issue of white background flickering upon page reload. This unsightly flickering occurs when the page initially loads in light mode before switching to dark mode.
Solution: Prevent Page Rendering
The key to resolving this flickering issue lies in blocking page rendering. By placing a small script tag within the
section of the document, you can halt the DOM parser process. This allows the JavaScript interpreter to assign the data-theme attribute to the element before continuing the page rendering process.Implementation:
- Add Script to :
<code class="html"><script>
// Set the theme in <HEAD> before any other tag.
const setTheme = (theme) => {
theme ??= localStorage.theme || "light";
document.documentElement.dataset.theme = theme;
localStorage.theme = theme;
};
setTheme();
</script></code>
- Move Scripts to End of :
Position all other scripts in a non-render-blocking manner, right before the closing tag:
<code class="html"><script src="js/index.js"></script> <!-- Other <script> tags here --> </body> </html></code>
- Update JavaScript for Toggle Functionality:
Inside your JavaScript file, adjust the code as follows:
<code class="javascript">const elToggleTheme = document.querySelector('#dark-mode-button input[type="checkbox"]');
elToggleTheme.checked = localStorage.theme === "dark";
elToggleTheme.addEventListener("change", () => {
const theme = elToggleTheme.checked ? "dark" : "light";
setTheme(theme);
});</code>
Additional Notes:
- You can combine the above JavaScript code into a single .js file if desired.
- Consider using a spinner or loading animation during the initial theme transition to improve the user experience.
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