VAADIN.addons.masonry.js.thirdparty.jquery.visible.js Maven / Gradle / Ivy

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(function ($) {

    /**
     * Copyright 2012, Digital Fusion
     * Licensed under the MIT license.
     * http://teamdf.com/jquery-plugins/license/
     *
     * @author Sam Sehnert
     * @desc A small plugin that checks whether elements are within
     *     the user visible viewport of a web browser.
     *     only accounts for vertical position, not horizontal.
     */

    $.fn.visible = function (partial) {

        var $t = $(this),
            $w = $(window),
            viewTop = $w.scrollTop(),
            viewBottom = viewTop + $w.height(),
            _top = $t.offset().top,
            _bottom = _top + $t.height(),
            compareTop = partial === true ? _bottom : _top,
            compareBottom = partial === true ? _top : _bottom;

        return ((compareBottom <= viewBottom) && (compareTop >= viewTop));

    };

})(jQuery);