source: tmcsimulator/trunk/webapps/einotebook/scripts/cookies.js @ 359

/**
 * Creates a new cookie if the given cookie name does not exist.
 * Sets a the cookie with the given name if it already exists.
 * The cookie that is created or set expires at the end of the session.
 * @param name {String} The name of the cookie.
 * @param value {Any} The value of the cookie.
 */
function setCookie(name, value)
{
        createCookie(name, value);
}

/**
 * Creates a new cookie if the given cookie name does not exist.
 * Sets a the cookie with the given name if it already exists.
 * If days is not given, the cookie expires when the session ends.
 * @param name {String} The name of the cookie.
 * @param value {Any} The value of the cookie.
 * @param days {Integer} (Optional) The number of days before the cookie expires.
 */
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 = "";
        }
        
        document.cookie = name+"="+value+expires+"; path=/";
        

}

/**
 * Reads the value of the cookie with the given name.
 * @param name The name of the cookie to be read.
 * @return The value of the cookie with the given name.
 */
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;
}

/**
 * Deletes the cookie with the given name.
 * @param name The name of the cookie to delete.
 */
function eraseCookie(name) 
{
        createCookie(name, "", -1);
}