Short Alert Using Vanilla Javascript



<script type="text/javascript">
	
function shortAlert(msg, duration, top, left) {
	var el = document.createElement("div");
	el.setAttribute("style","display: none; position: absolute; width: 200px; text-align: center; top: " + top + "%; left: " + left + "%; background-color: #444; color: white; padding: 25px; font-family: Arial; border-radius: 3px;");
	el.innerHTML = msg;
	fadeIn(el, 'block')	
	setTimeout(function(){ fadeOut(el) }, duration);
	document.body.appendChild(el);
}

function fadeOut(el) {
    el.style.opacity = 1;
    (function fade() {
        if ((el.style.opacity -= .05) < 0) {
            el.style.display = "none";
        } else {
            requestAnimationFrame(fade);
        }
    })();
};

function fadeIn(el, display) {
    el.style.opacity = 0;
    el.style.display = display || "block";
    (function fade() {
        var val = parseFloat(el.style.opacity);
        if (!((val += .05) > 1)) {
            el.style.opacity = val;
            requestAnimationFrame(fade);
        }
    })();
};

</script>

<body onload='shortAlert("Bookmark Saved", 3000, 20, 42.5);'></body>