'use strict';

/* --------------------------------------------------------------
 anchor.js 2015-10-28 gm
 Gambio GmbH
 http://www.gambio.de
 Copyright (c) 2015 Gambio GmbH
 Released under the GNU General Public License (Version 2)
 [http://www.gnu.org/licenses/gpl-2.0.html]
 --------------------------------------------------------------
 */

gambio.widgets.module('anchor', [], function (data) {

    'use strict';

    // ########## VARIABLE INITIALIZATION ##########

    var $this = $(this),
        defaults = {
        offset: 80, // Offset in px from top (to prevent the header is hiding an element)
        duration: 300 // Scroll duration in ms
    },
        options = $.extend(true, {}, defaults, data),
        module = {};

    // ########## EVENT HANDLER ##########

    /**
     * Handler for the click on an anchor
     * link. It calculates the position of
     * the target and scroll @ that position
     * @param       {object}        e           jQuery event object
     * @private
     */
    var _anchorHandler = function _anchorHandler(e) {
        var $self = $(this),
            $target = null,
            link = $self.attr('href'),
            position = null;

        // Only react if the link is an anchor
        if (link && link.indexOf('#') === 0 && link !== '#') {
            e.preventDefault();
            e.stopPropagation();

            $target = $(link);

            if ($target.length) {
                position = $target.offset().top;

                $('html, body').animate({ scrollTop: position - options.offset }, options.duration);
            }
        }
    };

    // ########## INITIALIZATION ##########

    /**
     * Init function of the widget
     * @constructor
     */
    module.init = function (done) {
        $this.on('click', 'a:not(.js-open-modal)', _anchorHandler);
        done();
    };

    // Return data to widget engine
    return module;
});
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