75 lines
2.7 KiB
JavaScript
75 lines
2.7 KiB
JavaScript
// TODO move this file into assets and use hugo pipes and babel
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(function(){
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var STATES = ["colorscheme-dark", "colorscheme-light", "colorscheme-auto"];
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var LABELS = ["On", "Off", "Auto"]; // display text of dark mode setting - corresponds with STATES array
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var CS_BTN_CLASS = 'cs-mode-button';
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var CS_BTN_CONTAINER_CLASS = 'cs-mode-container';
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var CS_BTN_TEXT_CLASS = 'cs-mode-button-state';
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var CS_MODE_COOKIE_NAME = "cs_mode"; // name of cookie that stores dark mode setting
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var MODE_BTN_TEXT_ELEMENT = document.getElementById(CS_BTN_TEXT_CLASS);
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var activeState = -1; // the active index of the STATES array
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var cookieMode; // dark mode setting value retrieved from cookie
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// toggles the color scheme between the states specified in the array STATES
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function toggleColorscheme() {
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for(var i = 0; i < STATES.length; i++) {
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if (document.body.classList.contains(STATES[i])) {
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document.body.classList.remove(STATES[activeState]);
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activeState = activeState < STATES.length - 1 ? activeState + 1 : 0;
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document.body.classList.add(STATES[activeState]);
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MODE_BTN_TEXT_ELEMENT.innerText = LABELS[activeState];
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document.cookie = CS_MODE_COOKIE_NAME + "=" + STATES[activeState] + "; path=/;max-age=315360000";
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break;
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}
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}
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}
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// returns the value fo the cookie named name
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// or null if not present.
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function getCookie(name) {
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var cookieList = document.cookie.split(";")
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var value = null;
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for (var i = 0; i < cookieList.length; i++) {
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if (cookieList[i].indexOf(CS_MODE_COOKIE_NAME + "=") > -1) {
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value = cookieList[i].substring(cookieList[i].indexOf('=') + 1);
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}
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}
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return value;
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}
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cookieMode = getCookie(CS_MODE_COOKIE_NAME);
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if (cookieMode !== null) {
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for(var i = 0; i < STATES.length; i++) {
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document.body.classList.remove(STATES[i]);
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}
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document.body.classList.add(cookieMode);
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// cannot set activeState directly in here, in case cookie is not present
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// (in which case, document.body will already have the class which was
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// specified in /layouts/_default/baseof.html, which we will use later).
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}
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// now we can use document.body.classlist to set activeState.
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for(var i = 0; i < STATES.length; i++) {
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if (document.body.classList.contains(STATES[i])) {
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activeState = i;
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}
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}
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MODE_BTN_TEXT_ELEMENT.innerText = LABELS[activeState];
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// if activeState is valid, add button's event listener,
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// otherwise hide the toggle button.
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if (activeState > -1) {
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document.getElementById(CS_BTN_CLASS).addEventListener('click', function() {
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toggleColorscheme();
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})
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} else {
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document.getElementById(CS_BTN_CONTAINER_CLASS).style.display = "none";
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}
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})();
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