Javascript Disposable Alert

Javascript disposable alert showing only once and tracked by cookies

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<div class="refork-widget" code="d30" style="width:100%;height:200px;" bcolor="#ccc"></div> <script type="text/javascript" src="//snippet.run/d/z.js"></script>

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Javascript

function createCookie(name, value, days) {
    var expires;

if (days) {
        var date = new Date();
        date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
        expires = "; expires=" + date.toGMTString();
    } else {
        expires = "";
    }
    document.cookie = encodeURIComponent(name) + "=" + encodeURIComponent(value) + expires + "; path=/";
}

function readCookie(name) {
    var nameEQ = encodeURIComponent(name) + "=";
    var ca = document.cookie.split(';');
    for (var i = 0; i &lt; ca.length; i++) {
        var c = ca[i];
        while (c.charAt(0) === ' ') c = c.substring(1, c.length);
        if (c.indexOf(nameEQ) === 0) return decodeURIComponent(c.substring(nameEQ.length, c.length));
    }
    return null;
}

function eraseCookie(name) {
    createCookie(name, "", -1);
}

Javascript Disposable Alert

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