Question

document.cookie = "happy=random stuff";
function readCookie(name) {
    var cookie,cname,i;
    cookie = document.cookie.split(";");
    cname = name;
    for (i=0; i<=cookie.length; i++) {
        var c = cookie[i];
        if (c.indexOf(cname) == 0) {
            alert(c.substring(cname.length,c.length));
            return c.substring(cname.length,c.length);
        }
    }
    return null;
}

readCookie("happy");

http://jsfiddle.net/a2R3j/
It appears that this line is wrong:

if (c.indexOf(cname) == 0) {

it works perfectly. However jsfiddle says there is an error. Is there actually anything wrong?

EDIT FOR CLARITY: I want it to return the cookie’s content by calling the function getCookie(name here)
another edit for clarity:
Yusaf Code:

Code with indexOf:

Answer 1

http://jsfiddle.net/6qLZe/

use .split("=")[1] rather than your substring method

document.cookie = "joker=batman";

function readCookie(cname) {
    var cookie_split = document.cookie.split(";");
    for (i = 0; i < cookie_split.length; i++) {
        var cookie_var = cookie_split[i].split("=")[0];
        if (cookie_var == cname) {
            return cookie_split[i].split("=")[1];
        }
    }
    return null
}

alert(readCookie("joker"));