jake/dark-mode-example
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Update dark-mode.js

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jake
2020-04-29 18:42:53 -04:00
committed by GitHub
parent 9169da7024
commit 18a85fd62c
1 changed files with 16 additions and 20 deletions
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dark-mode.js
+16 -20
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@@ -16,26 +16,25 @@
var pref_off = 'false'; var pref_off = 'false';
var pref = sto.getItem(pref_key); var pref = sto.getItem(pref_key);
// use an element with class `dark-mode-toggle` to trigger swap
var toggle = doc.querySelector('.dark-mode-toggle');
// keep track of current state (light by default) no matter how we got there // keep track of current state (light by default) no matter how we got there
var dark = false; var dark = false;
// change CSS via these body classes: // change CSS via these body classes:
var cls_light = 'light'; var cls_light = 'light';
var cls_dark = 'dark'; var cls_dark = 'dark';
var activateDarkMode = function() {
cls.remove(cls_light); var activateTheme = function(theme) {
cls.add(cls_dark); cls.remove(cls_light, cls_dark);
dark = true; cls.add(theme);
}; dark = (theme == cls_dark ? true : false);
var activateLightMode = function() {
cls.remove(cls_dark);
cls.add(cls_light);
dark = false;
}; };
// if user already explicitly toggled in the past, restore their preference. // if user already explicitly toggled in the past, restore their preference.
if (pref === pref_on) activateDarkMode(); if (pref === pref_on) activateTheme(cls_dark);
if (pref === pref_off) activateLightMode(); if (pref === pref_off) activateTheme(cls_light);
// user has never clicked the button, so go by their OS preference until/if they do so // user has never clicked the button, so go by their OS preference until/if they do so
if (!pref) { if (!pref) {
@@ -44,18 +43,15 @@
var prefers_light = '(prefers-color-scheme: light)'; var prefers_light = '(prefers-color-scheme: light)';
if (win.matchMedia(prefers_dark).matches) if (win.matchMedia(prefers_dark).matches)
activateDarkMode(); activateTheme(cls_dark);
else else
activateLightMode(); activateTheme(cls_light);
// real-time switching if supported by OS/browser // real-time switching if supported by OS/browser
win.matchMedia(prefers_dark).addListener(function(e) { if (e.matches) activateDarkMode(); }); win.matchMedia(prefers_dark).addListener(function(e) { if (e.matches) activateTheme(cls_dark); });
win.matchMedia(prefers_light).addListener(function(e) { if (e.matches) activateLightMode(); }); win.matchMedia(prefers_light).addListener(function(e) { if (e.matches) activateTheme(cls_light); });
} }
// use an element with class `dark-mode-toggle` to trigger swap
var toggle = doc.querySelector('.dark-mode-toggle');
// don't freak out if page happens not to have a toggle // don't freak out if page happens not to have a toggle
if (toggle) { if (toggle) {
// toggle re-appears now that we know user has JS enabled // toggle re-appears now that we know user has JS enabled
@@ -65,10 +61,10 @@
toggle.addEventListener('click', function() { toggle.addEventListener('click', function() {
// switch to the opposite theme & save preference in local storage // switch to the opposite theme & save preference in local storage
if (!dark) { if (!dark) {
activateDarkMode(); activateTheme(cls_dark);
sto.setItem(pref_key, pref_on); sto.setItem(pref_key, pref_on);
} else { } else {
activateLightMode(); activateTheme(cls_light);
sto.setItem(pref_key, pref_off); sto.setItem(pref_key, pref_off);
} }
}, true); }, true);