Util functions for set/get cookie.

frontend/utils.js

@@ -19,4 +19,31 @@ function daysAgo(date) {
   return Math.round(Math.abs((new Date() - new Date(date)) / day));
 }
 
+export function createCookie(name, value, days) {
+  if (days) {
+    var date = new Date();
+    date.setTime(date.getTime() + days * 24 * 60 * 60 * 1000);
+    var expires = "; expires=" + date.toGMTString();
+  } else var expires = "";
+
+  const domain = `${window.location.hostname}`;
+  console.log("cookie:", `${name}=${value + expires}; path=/; domain=${domain}`);
+  document.cookie = `${name}=${value + expires}; path=/; domain=${domain}`;
+}
+
+export function readCookie(name) {
+  var nameEQ = name + "=";
+  var ca = document.cookie.split(";");
+  for (var i = 0; i < ca.length; i++) {
+    var c = ca[i];
+    while (c.charAt(0) == " ") c = c.substring(1, c.length);
+    if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length, c.length);
+  }
+  return null;
+}
+
+export function eraseCookie(name) {
+  createCookie(name, "", -1);
+}
+
 export { dateString, humanReadableDate, daysAgo };