news/plugins/admin/themes/grav/app/utils/bootstrap-dropdown.js

import jQuery from 'jquery';

/* ========================================================================
 * Bootstrap: dropdown.js v3.4.1
 * https://getbootstrap.com/docs/3.4/javascript/#dropdowns
 * ========================================================================
 * Copyright 2011-2019 Twitter, Inc.
 * Licensed under MIT (https://github.com/twbs/bootstrap/blob/v3-dev/LICENSE)
 * ======================================================================== */

+(function($) {
    'use strict';

    // DROPDOWN CLASS DEFINITION
    // =========================

    const backdrop = '.dropdown-backdrop';
    const toggle = '[data-toggle="dropdown"]';
    const Dropdown = function(element) {
        $(element).on('click.bs.dropdown', this.toggle);
    };

    Dropdown.VERSION = '3.4.1';

    function getParent($this) {
        let selector = $this.attr('data-target');

        if (!selector) {
            selector = $this.attr('href');
            selector = selector && /#[A-Za-z]/.test(selector) && selector.replace(/.*(?=#[^\s]*$)/, ''); // strip for ie7
        }

        const $parent = selector !== '#' ? $(document).find(selector) : null;

        return $parent && $parent.length ? $parent : $this.parent();
    }

    function clearMenus(e) {
        if (e && e.which === 3) { return; }
        $(backdrop).remove();
        $(toggle).each(function() {
            const $this = $(this);
            const $parent = getParent($this);
            const relatedTarget = { relatedTarget: this };

            if (!$parent.hasClass('open')) { return; }

            if (e && e.type === 'click' && /input|textarea/i.test(e.target.tagName) && $.contains($parent[0], e.target)) { return; }

            $parent.trigger(e = $.Event('hide.bs.dropdown', relatedTarget));

            if (e.isDefaultPrevented()) { return; }

            $this.attr('aria-expanded', 'false');
            $parent.removeClass('open').trigger($.Event('hidden.bs.dropdown', relatedTarget));
        });
    }

    Dropdown.prototype.toggle = function(e) {
        const $this = $(this);

        if ($this.is('.disabled, :disabled')) { return; }

        const $parent = getParent($this);
        const isActive = $parent.hasClass('open');

        clearMenus();

        if (!isActive) {
            if ('ontouchstart' in document.documentElement && !$parent.closest('.navbar-nav').length) {
                // if mobile we use a backdrop because click events don't delegate
                $(document.createElement('div'))
                    .addClass('dropdown-backdrop')
                    .insertAfter($(this))
                    .on('click', clearMenus);
            }

            const relatedTarget = { relatedTarget: this };
            $parent.trigger(e = $.Event('show.bs.dropdown', relatedTarget));

            if (e.isDefaultPrevented()) { return; }

            $this
                .trigger('focus')
                .attr('aria-expanded', 'true');

            $parent
                .toggleClass('open')
                .trigger($.Event('shown.bs.dropdown', relatedTarget));
        }

        return false;
    };

    Dropdown.prototype.keydown = function(e) {
        if (!/(38|40|27|32)/.test(e.which) || /input|textarea/i.test(e.target.tagName)) return;

        const $this = $(this);

        e.preventDefault();
        e.stopPropagation();

        if ($this.is('.disabled, :disabled')) {
            return;
        }

        const $parent = getParent($this);
        const isActive = $parent.hasClass('open');

        if (!isActive && e.which !== 27 || isActive && e.which === 27) {
            if (e.which === 27) {
                $parent.find(toggle).trigger('focus');
            }

            return $this.trigger('click');
        }

        const desc = ' li:not(.disabled):visible a';
        const $items = $parent.find('.dropdown-menu' + desc);

        if (!$items.length) {
            return;
        }

        let index = $items.index(e.target);

        if (e.which === 38 && index > 0) { index--; } // up
        if (e.which === 40 && index < $items.length - 1) { index++; } // down
        if (!~index) { index = 0; }

        $items.eq(index).trigger('focus');
    };

    // DROPDOWN PLUGIN DEFINITION
    // ==========================

    function Plugin(option) {
        return this.each(function() {
            const $this = $(this);
            let data = $this.data('bs.dropdown');

            if (!data) $this.data('bs.dropdown', (data = new Dropdown(this)));
            if (typeof option === 'string') data[option].call($this);
        });
    }

    const old = $.fn.dropdown;

    $.fn.dropdown = Plugin;
    $.fn.dropdown.Constructor = Dropdown;

    // DROPDOWN NO CONFLICT
    // ====================

    $.fn.dropdown.noConflict = function() {
        $.fn.dropdown = old;
        return this;
    };

    // APPLY TO STANDARD DROPDOWN ELEMENTS
    // ===================================

    $(document)
        .on('click.bs.dropdown.data-api', clearMenus)
        .on('click.bs.dropdown.data-api', '.dropdown form', function(e) { e.stopPropagation(); })
        .on('click.bs.dropdown.data-api', toggle, Dropdown.prototype.toggle)
        .on('keydown.bs.dropdown.data-api', toggle, Dropdown.prototype.keydown)
        .on('keydown.bs.dropdown.data-api', '.dropdown-menu', Dropdown.prototype.keydown);
}(jQuery));