visibilitychange example

gistfile1.txt

(function() {
    var hidden = "hidden";

    // Standards:
    if (hidden in document)
        document.addEventListener("visibilitychange", onchange);
    else if ((hidden = "mozHidden") in document)
        document.addEventListener("mozvisibilitychange", onchange);
    else if ((hidden = "webkitHidden") in document)
        document.addEventListener("webkitvisibilitychange", onchange);
    else if ((hidden = "msHidden") in document)
        document.addEventListener("msvisibilitychange", onchange);
    // IE 9 and lower:
    else if ('onfocusin' in document)
        document.onfocusin = document.onfocusout = onchange;
    // All others:
    else
        window.onpageshow = window.onpagehide 
            = window.onfocus = window.onblur = onchange;

    function onchange (evt) {
        GameAudio.settings.globalMute = !GameAudio.settings.globalMute;
        if ( true === GameAudio.settings.globalMute ) {
            Howler.mute();
        } else {
            Howler.unmute();
        }
        //Howler.mute();
        /*
        var v = 'visible', h = 'hidden',
            evtMap = { 
                focus:v, focusin:v, pageshow:v, blur:h, focusout:h, pagehide:h 
            };

        evt = evt || window.event;
        if (evt.type in evtMap)
            document.body.className = evtMap[evt.type];
        else        
            document.body.className = this[hidden] ? "hidden" : "visible";
        */
    }
})();