Is a given element on the screen at this time?

isvisible.js

/**
 * Check whether an element is visible
 * @param  {jQuery} elm jQuery element
 * @return {Boolean}    True if any part of the element is on the screen.
 */
function isVisible( ele ) {
    var viewportTop = $(window).scrollTop();
    var viewportBottom = viewportTop + $(window).height();
    var eleTop = $(ele).offset().top;
    var eleBottom = eleTop + $(ele).height();

    return eleBottom > viewportTop && eleTop < viewportBottom;
}

if(window.module && module.exports){
    module.exports = isVisible;
}