jspopunder.js

/*
js-popunder
pure javascript function for creating pop-under windows
https://github.com/tuki/js-popunder
*/
function jsPopunder(sUrl, sConfig) {

    var _parent  = (top != self && typeof(top.document.location.toString()) === 'string') ? top : self;
    var popunder = null;

    sConfig      = (sConfig || {});

    var sName    = (sConfig.name   || Math.floor((Math.random() * 1000) + 1));
    var sWidth   = (sConfig.width  || window.outerWidth  || window.innerWidth);
    var sHeight  = (sConfig.height || (window.outerHeight-100) || window.innerHeight);

    var sPosX    = (typeof(sConfig.left) != 'undefined') ? sConfig.left.toString() : window.screenX;
    var sPosY    = (typeof(sConfig.top)  != 'undefined') ? sConfig.top.toString()  : window.screenY;

    /* capping */
    var sWait    = (sConfig.wait || 3600); sWait = (sWait * 1000);
    var sCap     = (sConfig.cap  || 2);

    /* cookie stuff */
    var popsToday = 0;
    var cookie    = (sConfig.cookie || '__.popunder');

    var browser = function() {
        var n = navigator.userAgent.toLowerCase();
        var b = {
            webkit: /webkit/.test(n),
            mozilla: (/mozilla/.test(n)) && (!/(compatible|webkit)/.test(n)),
            chrome: /chrome/.test(n),
            msie: (/msie/.test(n)) && (!/opera/.test(n)),
            firefox: /firefox/.test(n),
            safari: (/safari/.test(n) && !(/chrome/.test(n))),
            opera: /opera/.test(n)
        };
        b.version = (b.safari) ? (n.match(/.+(?:ri)[\/: ]([\d.]+)/) || [])[1] : (n.match(/.+(?:ox|me|ra|ie)[\/: ]([\d.]+)/) || [])[1];
        return b;
    }();


    function isCapped() {
        try {
            popsToday = Math.floor(document.cookie.split(cookie + 'Cap=')[1].split(';')[0]);
        } catch (err) {}
        return (sCap <= popsToday || document.cookie.indexOf(cookie + '=') !== -1);
    }


    function doPopunder(sUrl, sName, sWidth, sHeight, sPosX, sPosY) {
        if (isCapped()) return;

        var sOptions = 'toolbar=no,scrollbars=yes,location=yes,statusbar=yes,menubar=no,resizable=1,width=' + sWidth.toString() + ',height=' + sHeight.toString() + ',screenX=' + sPosX + ',screenY=' + sPosY;

        var listenerEvent = function() {
            if (isCapped()) return;

            popunder = _parent.window.open(sUrl, sName, sOptions);
            if (popunder) {
                // cookie
                var now  = new Date();
                var next = new Date(now.setTime(now.getTime() + sWait));
                document.cookie = cookie + '=1;expires=' + next.toGMTString() + ';path=/';
                var tomorrow = new Date(); tomorrow.setHours(24,0,0,0);
                document.cookie = cookie + 'Cap=' + (popsToday + 1) + ';expires=' + tomorrow.toGMTString() + ';path=/';
                pop2under();
            }
        };

        // trigger on document.click
        if (document.addEventListener) {
            document.addEventListener("click", listenerEvent, false);
        } else {
            document.attachEvent("onclick", listenerEvent);
        }
    }


    function pop2under() {
        try {
            popunder.blur();
            popunder.opener.window.focus();
            window.self.window.focus();
            window.focus();

            if (browser.firefox) openCloseWindow();
            if (browser.webkit) openCloseTab();
            if (browser.msie) {
                setTimeout(function() {
                    popunder.blur();
                    popunder.opener.window.focus();
                    window.self.window.focus();
                    window.focus();
                }, 1000);
            }
        } catch (e) {}
    }

    function openCloseWindow() {
        var ghost = window.open('about:blank');
        ghost.focus();
        ghost.close();
    }

    function openCloseTab() {
        var nothing = '';
        var ghost = document.createElement("a");
        ghost.href   = "data:text/html,<scr"+nothing+"ipt>window.close();</scr"+nothing+"ipt>";
        document.getElementsByTagName("body")[0].appendChild(ghost);

        var clk = document.createEvent("MouseEvents");
        clk.initMouseEvent("click", false, true, window, 0, 0, 0, 0, 0, true, false, false, true, 0, null);
        ghost.dispatchEvent(clk);

        ghost.parentNode.removeChild(ghost);
    }


    // abort?
    if (isCapped()) {
        return;
    } else {
        doPopunder(sUrl, sName, sWidth, sHeight, sPosX, sPosY);
    }
}