jquery.jcarousel-scrollintoview.js

/*! jCarousel - v0.3.0 - 2014-01-09
* http://sorgalla.com/jcarousel
* Copyright (c) 2014 Jan Sorgalla; Licensed MIT */
(function($) {
    'use strict';

    $.jcarousel.fn.scrollIntoView = function(target, animate, callback) {
        var parsed = $.jCarousel.parseTarget(target),
            first  = this.index(this._fullyvisible.first()),
            last   = this.index(this._fullyvisible.last()),
            index;

        if (parsed.relative) {
            index = parsed.target < 0 ? Math.max(0, first + parsed.target) : last + parsed.target;
        } else {
            index = typeof parsed.target !== 'object' ? parsed.target : this.index(parsed.target);
        }

        if (index < first) {
            return this.scroll(index, animate, callback);
        }

        if (index >= first && index <= last) {
            if ($.isFunction(callback)) {
                callback.call(this, false);
            }

            return this;
        }

        var items = this.items(),
            clip = this.clipping(),
            lrb  = this.vertical ? 'bottom' : (this.rtl ? 'left'  : 'right'),
            wh   = 0,
            curr;

        while (true) {
            curr = items.eq(index);

            if (curr.length === 0) {
                break;
            }

            wh += this.dimension(curr);

            if (wh >= clip) {
                var margin = parseFloat(curr.css('margin-' + lrb)) || 0;
                if ((wh - margin) !== clip) {
                    index++;
                }
                break;
            }

            if (index <= 0) {
                break;
            }

            index--;
        }

        return this.scroll(index, animate, callback);
    };
}(jQuery));