darkmode toggle switch with local storage to remember the last selection
Here is a darkmode toggle switch, that swaps out the body class so you can target dark-mode or light-mode on all your elements!
It saves to local storage the last selection so if you come back to the site later it will remember your previous selection.
I modified this from another version of the code i found, but not sure where i originally found it, so if its yours let me know and ill link you as the source!
the demo button below does not work exactly as it has the same id as the one at the top of the site, but it still runs the dark mode and light mode function.
HTML
<a href="javascript:void()" class="btn btn-outline-info btn-lg ml-auto font-weight-bold" id="theme-toggler" onclick="toggleTheme()">🌙 Dark</a>Javascript
// you can use app's unique identifier here
const LOCAL_STORAGE_KEY = "custom-grid-theme";
const LOCAL_META_DATA = JSON.parse(localStorage.getItem(LOCAL_STORAGE_KEY));
// you can change this url as needed
const DARK_THEME_PATH = "https://bootswatch.com/4/cyborg/bootstrap.min.css";
/* const DARK_THEME_PATH = "https://kruxor.com/css/bootstrap.slate.min.css"; */
const DARK_STYLE_LINK = document.getElementById("dark-theme-style");
const THEME_TOGGLER = document.getElementById("theme-toggler");
let isDark = LOCAL_META_DATA && LOCAL_META_DATA.isDark;
// check if user has already selected dark theme earlier
if (isDark) {
enableDarkTheme();
} else {
disableDarkTheme();
}
/**
* Apart from toggling themes, this will also store user's theme preference in local storage.
* So when user visits next time, we can load the same theme.
*
*/
function toggleTheme() {
isDark = !isDark;
if (isDark) {
enableDarkTheme();
} else {
disableDarkTheme();
}
const META = { isDark };
localStorage.setItem(LOCAL_STORAGE_KEY, JSON.stringify(META));
}
function enableDarkTheme() {
var body = document.querySelector('body');
body.classList.add('dark-mode');
body.classList.remove('light-mode');
THEME_TOGGLER.innerHTML = "🌙 Dark";
}
function disableDarkTheme() {
var body = document.querySelector('body');
body.classList.add('light-mode');
body.classList.remove('dark-mode');
THEME_TOGGLER.innerHTML = "🌞 Light";
}View Statistics
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"Olivia, my eldest daughter, caught measles when she was seven years old. As the illness took its usual course I can remember reading to her often in bed and not feeling particularly alarmed about it. Then one morning, when she was well on the road to recovery, I was sitting on her bed showing her how to fashion little animals out of coloured pipe-cleaners, and when it came to her turn to make one herself, I noticed that her fingers and her mind were not working together and she couldn’t do anything. 'Are you feeling all right?' I asked her. 'I feel all sleepy,' she said. In an hour, she was unconscious. In twelve hours she was dead. The measles had turned into a terrible thing called measles encephalitis and there was nothing the doctors could do to save her. That was...in 1962, but even now, if a child with measles happens to develop the same deadly reaction from measles as Olivia did, there would still be nothing the doctors could do to help her. On the other hand, there is today something that parents can do to make sure that this sort of tragedy does not happen to a child of theirs. They can insist that their child is immunised against measles. ...I dedicated two of my books to Olivia, the first was ‘James and the Giant Peach’. That was when she was still alive. The second was ‘The BFG’, dedicated to her memory after she had died from measles. You will see her name at the beginning of each of these books. And I know how happy she would be if only she could know that her death had helped to save a good deal of illness and death among other children."
I just checked google books for BFG, and the dedication is there.
https://www.google.com.au/books/edition/_/quybcXrFhCIC?hl=en&gbpv=1
Roald Dahl, 1986
