Proyectos de Subversion Moodle

// This file is part of Moodle - http://moodle.org/

//

// Moodle is free software: you can redistribute it and/or modify

// it under the terms of the GNU General Public License as published by

// the Free Software Foundation, either version 3 of the License, or

// (at your option) any later version.

//

// Moodle is distributed in the hope that it will be useful,

// but WITHOUT ANY WARRANTY; without even the implied warranty of

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

// GNU General Public License for more details.

//

// You should have received a copy of the GNU General Public License

// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**

 * Provide global helper code to enhance page elements.

 *

 * @module     core/page_global

 * @copyright  2018 Ryan Wyllie <ryan@moodle.com>

 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later

 */

define(

[

    'jquery',

    'core/custom_interaction_events',

    'core/str',

    'core/network'

],

function(

    $,

    CustomEvents,

    Str,

    Network

) {

    /**

     * Add an event handler for dropdown menus that wish to show their active item

     * in the dropdown toggle element.

     *

     * By default the handler will add the "active" class to the selected dropdown

     * item and set it's text as the HTML for the dropdown toggle.

     *

     * The behaviour of this handler is controlled by adding data attributes to

     * the HTML and requires the typically Bootstrap dropdown markup.

     *

     * data-show-active-item - Add to the .dropdown-menu element to enable default

     *                         functionality.

     * data-skip-active-class - Add to the .dropdown-menu to prevent this code from

     *                          adding the active class to the dropdown items

     * data-active-item-text - Add to an element within the data-toggle="dropdown" element

     *                         to use it as the active option text placeholder otherwise the

     *                         data-toggle="dropdown" element itself will be used.

     * data-active-item-button-aria-label-components - String components to set the aria

     *                         lable on the dropdown button. The string will be given the

     *                         active item text.

     */

    var initActionOptionDropdownHandler = function() {

        var body = $('body');

        CustomEvents.define(body, [CustomEvents.events.activate]);

        body.on(CustomEvents.events.activate, '[data-show-active-item]', function(e) {

            // The dropdown item that the user clicked on.

            var option = $(e.target).closest('.dropdown-item');

            // The dropdown menu element.

            var menuContainer = option.closest('[data-show-active-item]');

            if (!option.hasClass('dropdown-item')) {

                // Ignore non Bootstrap dropdowns.

                return;

            }

            if (option.hasClass('active')) {

                // If it's already active then we don't need to do anything.

                return;

            }

            // Clear the active class from all other options.

            var dropdownItems = menuContainer.find('.dropdown-item');

            dropdownItems.removeClass('active');

            dropdownItems.removeAttr('aria-current');

            if (!menuContainer.attr('data-skip-active-class')) {

                // Make this option active unless configured to ignore it.

                // Some code, for example the Bootstrap tabs, may want to handle

                // adding the active class itself.

                option.addClass('active');

            }

            // Update aria attribute for active item.

            option.attr('aria-current', true);

            var activeOptionText = option.text();

            var dropdownToggle = menuContainer.parent().find('[data-toggle="dropdown"]');

            var dropdownToggleText = dropdownToggle.find('[data-active-item-text]');

            if (dropdownToggleText.length) {

                // We have a specific placeholder for the active item text so

                // use that.

                dropdownToggleText.html(activeOptionText);

            } else {

                // Otherwise just replace all of the toggle text with the active item.

                dropdownToggle.html(activeOptionText);

            }

            var activeItemAriaLabelComponent = menuContainer.attr('data-active-item-button-aria-label-components');

            if (activeItemAriaLabelComponent) {

                // If we have string components for the aria label then load the string

                // and set the label on the dropdown toggle.

                var strParams = activeItemAriaLabelComponent.split(',');

                strParams.push(activeOptionText);

                Str.get_string(strParams[0].trim(), strParams[1].trim(), strParams[2].trim())

                    .then(function(string) {

                        dropdownToggle.attr('aria-label', string);

                        return string;

                    })

                    .catch(function() {

                        // Silently ignore that we couldn't load the string.

                        return false;

                    });

            }

        });

    };

    /**

     * Initialise the global helper functions.

     */

    var init = function() {

        initActionOptionDropdownHandler();

        Network.init();

    };

    return {

        init: init

    };

});