Initial Commit

assets/js/cookie-helpers.js

@@ -0,0 +1,101 @@
+/**
+ * Create a new cookie.
+ *
+ * @param {string} name The cookie name.
+ * @param {*} value The cookie value.
+ * @param {number} days The expiration, in days.
+ * @return {void}
+ */
+window.wu_create_cookie = function(name, value, days) {
+
+  let expires;
+
+  if (days) {
+
+    const date = new Date();
+
+    date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
+
+    expires = '; expires=' + date.toGMTString();
+
+  } else {
+
+    expires = '';
+
+  } // end if;
+
+  document.cookie = name + '=' + value + expires + '; path=/';
+
+};
+
+/**
+ * Reads from a cookie.
+ *
+ * @param {string} name The cookie name
+ * @return {*} The cookie value
+ */
+window.wu_read_cookie = function(name) {
+
+  const nameEQ = name + '=';
+
+  const ca = document.cookie.split(';');
+
+  for (let i = 0; i < ca.length; i++) {
+
+    let c = ca[i];
+
+    while (c.charAt(0) === ' ') {
+
+      c = c.substring(1, c.length);
+
+    } // end while;
+
+    if (c.indexOf(nameEQ) === 0) {
+
+      return c.substring(nameEQ.length, c.length);
+
+    } // end if;
+
+  } // end for;
+
+  return null;
+
+};
+
+/**
+ * Erase a cookie.
+ *
+ * @param {string} name The cookie name.
+ */
+window.wu_erase_cookie = function(name) {
+
+  window.wu_create_cookie(name, '', -1);
+
+};
+
+/**
+ * Listens to a particular cookie to catch a change in value.
+ *
+ * @param {string} name The cookie name.
+ * @param {Function} callback The callback to call when a change is detected.
+ */
+window.wu_listen_to_cookie_change = function(name, callback) {
+
+  let cookie_value = window.wu_read_cookie(name);
+
+  setInterval(function() {
+
+    const new_cookie_value = window.wu_read_cookie(name);
+
+    if (new_cookie_value !== cookie_value) {
+
+      // update registry so we dont get triggered again
+      cookie_value = new_cookie_value;
+
+      callback(cookie_value);
+
+    } // end if;
+
+  }, 100);
+
+};