102 lines
1.8 KiB
JavaScript
102 lines
1.8 KiB
JavaScript
/**
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* Create a new cookie.
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*
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* @param {string} name The cookie name.
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* @param {*} value The cookie value.
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* @param {number} days The expiration, in days.
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* @return {void}
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*/
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window.wu_create_cookie = function(name, value, days) {
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let expires;
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if (days) {
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const date = new Date();
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date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
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expires = '; expires=' + date.toGMTString();
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} else {
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expires = '';
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} // end if;
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document.cookie = name + '=' + value + expires + '; path=/';
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};
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/**
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* Reads from a cookie.
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*
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* @param {string} name The cookie name
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* @return {*} The cookie value
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*/
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window.wu_read_cookie = function(name) {
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const nameEQ = name + '=';
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const ca = document.cookie.split(';');
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for (let i = 0; i < ca.length; i++) {
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let c = ca[i];
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while (c.charAt(0) === ' ') {
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c = c.substring(1, c.length);
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} // end while;
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if (c.indexOf(nameEQ) === 0) {
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return c.substring(nameEQ.length, c.length);
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} // end if;
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} // end for;
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return null;
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};
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/**
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* Erase a cookie.
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*
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* @param {string} name The cookie name.
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*/
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window.wu_erase_cookie = function(name) {
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window.wu_create_cookie(name, '', -1);
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};
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/**
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* Listens to a particular cookie to catch a change in value.
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*
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* @param {string} name The cookie name.
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* @param {Function} callback The callback to call when a change is detected.
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*/
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window.wu_listen_to_cookie_change = function(name, callback) {
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let cookie_value = window.wu_read_cookie(name);
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setInterval(function() {
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const new_cookie_value = window.wu_read_cookie(name);
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if (new_cookie_value !== cookie_value) {
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// update registry so we dont get triggered again
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cookie_value = new_cookie_value;
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callback(cookie_value);
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} // end if;
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}, 100);
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};
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