Increment a cookie value by 1 - cookies

Question

I have a text field and a submit button. User submits an email id and on successful submission a lightbox will load. On successful submission I am setting a cookie and initially assigning a value of 1. Though I am able to set the increment I am not able to assign the incremented value to the cookie value.
var demoCookieCount = getCookie("democount");
$('#online-demo-lightbox-button').click(function (e) {
e.preventDefault();
demoCookiecount++;
});

Answer 1

You have to store the new value in the cookie by using setCookie() or something like
function setCookie(democount, ++demoCookiecount, 1)
{
var exdate=new Date();
exdate.setDate(exdate.getDate() + exdays);
var c_value=escape(value) + ((exdays==null) ? "" : "; expires="+exdate.toUTCString());
document.cookie=c_name + "=" + c_value;
}

Answer 2

You don't save the new value into the cookie. Try something like that in the end:
document.cookie = cookieName + cookieContent + cookieExpires;

Answer 3

Finally somehow got through. This piece of code worked
//setting the Cookie democount with initial value of 1
setCookie("democount", '1');
//getting the value of 'democount' cookie and assigning it to a variable
var demoCookieCount = getCookie("democount");
$('#sample-button').click(function (e) {
e.preventDefault();
//increment the variable on every click
demoCookieCount++;
//set the incremented value of demoCookieCount variable to democount cookie
setCookie("democount",demoCookieCount);
// assigning the value of demoCookiecount to variable 123
var123 = getCookie("democount");
});