Web Club Repository. JavaScript - Counter

# <h>КЛАДОВАЯ</h>

## Счетчик посещений

    <html>
    <head>
    <script language="JavaScript">
    // Boolean variable specified if alert should be displayed if cookie exceeds 4KB
    var caution = false

    // name - name of the cookie
    // value - value of the cookie
    // [expires] - expiration date of the cookie (defaults to end of current session)
    // [path] - path for which the cookie is valid (defaults to path of calling document)
    // [domain] - domain for which the cookie is valid (defaults to domain of calling document)
    // [secure] - Boolean value indicating if the cookie transmission requires a secure transmission
    // * an argument defaults when it is assigned null as a placeholder
    // * a null placeholder is not required for trailing omitted arguments
    function setCookie(name, value, expires, path, domain, secure) {
            var curCookie = name + "=" + escape(value) +
                    ((expires) ? "; expires=" + expires.toGMTString() : "") +
                    ((path) ? "; path=" + path : "") +
                    ((domain) ? "; domain=" + domain : "") +
                    ((secure) ? "; secure" : "")
            if (!caution || (name + "=" + escape(value)).length <= 4000)
                    document.cookie = curCookie
            else
                    if (confirm("Cookie exceeds 4KB and will be cut!"))
                            document.cookie = curCookie
    }

    // name - name of the desired cookie
    // * return string containing value of specified cookie or null if cookie does not exist
    function getCookie(name) {
            var prefix = name + "="
            var cookieStartIndex = document.cookie.indexOf(prefix)
            if (cookieStartIndex == -1)
                    return null
            var cookieEndIndex = document.cookie.indexOf(";", cookieStartIndex + prefix.length)
            if (cookieEndIndex == -1)
                    cookieEndIndex = document.cookie.length
            return unescape(document.cookie.substring(cookieStartIndex + prefix.length, cookieEndIndex))
    }

    // name - name of the cookie
    // [path] - path of the cookie (must be same as path used to create cookie)
    // [domain] - domain of the cookie (must be same as domain used to create cookie)
    // * path and domain default if assigned null or omitted if no explicit argument proceeds
    function deleteCookie(name, path, domain) {
            if (getCookie(name)) {
                    document.cookie = name + "=" +
                    ((path) ? "; path=" + path : "") +
                    ((domain) ? "; domain=" + domain : "") +
                    "; expires=Thu, 01-Jan-70 00:00:01 GMT"
            }
    }

    // date - any instance of the Date object
    // * you should hand all instances of the Date object to this function for "repairs"
    // * this function is taken from Chapter 14, "Time and Date in JavaScript", in "Learn Advanced JavaScript Programming"
    function fixDate(date) {
            var base = new Date(0)
            var skew = base.getTime()
            if (skew > 0)
                    date.setTime(date.getTime() - skew)
    }
    </script>
    </head>
    <body>
    <script language="JavaScript">
    <!--
    var now = new Date()
    fixDate(now)
    now.setTime(now.getTime() + 365 * 24 * 60 * 60 * 1000)
    var visits = getCookie("counter")
    if (!visits)
            visits = 1
    else
            visits = parseInt(visits) + 1
    setCookie("counter", visits, now)
    document.write("Вы были здесь " + visits + " раз(а).")
    // -->
    </script>
    </body>
    </html>