Finally, we define a function that checks if a cookie is set.
If the cookie exists, it will display a greeting message.
If the cookie is not set, it will show a prompt asking for the user’s name and then store the username in a cookie for 365 days by calling the setCookie function.
| function checkCookie() { let username = getCookie(“username”); if (username != “”) { alert(“Welcome again “ + username); } else { username = prompt(“Please enter your name:”, “”); if (username != “” && username != null) { setCookie(“username”, username, 365); } } } |
| function setCookie(cname, cvalue, exdays) { const d = new Date(); d.setTime(d.getTime() + (exdays * 24 * 60 * 60 * 1000)); let expires = “expires=”+d.toUTCString(); document.cookie = cname + “=” + cvalue + “;” + expires + “;path=/”; } function getCookie(cname) { let name = cname + “=”; let ca = document.cookie.split(‘;’); for(let i = 0; i < ca.length; i++) { let c = ca[i]; while (c.charAt(0) == ‘ ‘) { c = c.substring(1); } if (c.indexOf(name) == 0) { return c.substring(name.length, c.length); } } return “”; } function checkCookie() { let user = getCookie(“username”); if (user != “”) { alert(“Welcome again “ + user); } else { user = prompt(“Please enter your name:”, “”); if (user != “” && user != null) { setCookie(“username”, user, 365); } } } |
The example above calls the checkCookie() function when the page is loaded.