64 lines
1.5 KiB
JavaScript
64 lines
1.5 KiB
JavaScript
var use_local_storage = storage_check();
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var html_element = null;
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function dgel(id) {
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return document.getElementById(id);
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}
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function storage_check() {
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// based on https://developer.mozilla.org/en-US/docs/Web/API/Web_Storage_API/Using_the_Web_Storage_API
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try {
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let x = 'test';
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localStorage.setItem(x, x);
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localStorage.removeItem(x);
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return true;
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}
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catch (e) {
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// fall back to cookies
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// i guess this might break if someone has cookies and localstorage disabled but people with first party cookies blocked are used to things breaking anyway ;)
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return false;
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}
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}
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function theme_get() {
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// true if night theme
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if (use_local_storage) {
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// weakly typed languages. not even once.
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return localStorage.getItem('theme') == 'true';
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} else {
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return document.cookie == 'theme=true';
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}
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}
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function theme_set(night) {
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if (use_local_storage) {
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localStorage.setItem('theme', night);
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} else {
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document.cookie = `theme=${night}`;
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}
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}
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function update_page_theme() {
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let night = theme_get();
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if (night) {
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html_element.classList.add('night');
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} else {
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html_element.classList.remove('night');
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}
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}
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window.addEventListener('DOMContentLoaded', (event) => {
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html_element = document.getElementsByTagName('html')[0];
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update_page_theme();
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dgel('theme-control').onclick = function () {
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// only add the 'ready' class upon clicking the button
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// this avoids the page transitioning every time you change the page with night theme on
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html_element.classList.add('ready');
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theme_set(!theme_get());
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update_page_theme();
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};
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});
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