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This file is part of Moodle - http://moodle.org/\n//\n// Moodle is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n//\n// Moodle is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n//\n// You should have received a copy of the GNU General Public License\n// along with Moodle. If not, see <http://www.gnu.org/licenses/>.\n\n/**\n * A class to help show and hide advanced form content.\n *\n * @module core_form/showadvanced\n * @class showadvanced\n * @package core_form\n * @copyright 2016 Damyon Wiese <damyon@moodle.com>\n * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later\n */\ndefine(['jquery', 'core/log', 'core/str', 'core/notification'], function($, Log, Strings, Notification) {\n\n var SELECTORS = {\n FIELDSETCONTAINSADVANCED: 'fieldset.containsadvancedelements',\n DIVFITEMADVANCED: 'div.fitem.advanced',\n DIVFCONTAINER: 'div.fcontainer',\n MORELESSLINK: 'fieldset.containsadvancedelements .moreless-toggler'\n },\n CSS = {\n SHOW: 'show',\n MORELESSACTIONS: 'moreless-actions',\n MORELESSTOGGLER: 'moreless-toggler',\n SHOWLESS: 'moreless-less'\n },\n WRAPPERS = {\n FITEM: '<div class=\"fitem\"></div>',\n FELEMENT: '<div class=\"felement\"></div>'\n },\n IDPREFIX = 'showadvancedid-';\n\n /** @type {Integer} uniqIdSeed Auto incrementing number used to generate ids. */\n var uniqIdSeed = 0;\n\n /**\n * ShowAdvanced behaviour class.\n * @param {String} id The id of the form.\n */\n var ShowAdvanced = function(id) {\n this.id = id;\n\n var form = $(document.getElementById(id));\n this.enhanceForm(form);\n };\n\n /** @type {String} id The form id to enhance. */\n ShowAdvanced.prototype.id = '';\n\n /**\n * @method enhanceForm\n * @param {JQuery} form JQuery selector representing the form\n * @return {ShowAdvanced}\n */\n ShowAdvanced.prototype.enhanceForm = function(form) {\n var fieldsets = form.find(SELECTORS.FIELDSETCONTAINSADVANCED);\n\n // Enhance each fieldset in the form matching the selector.\n fieldsets.each(function(index, item) {\n this.enhanceFieldset($(item));\n }.bind(this));\n\n // Attach some event listeners.\n // Subscribe more/less links to click event.\n form.on('click', SELECTORS.MORELESSLINK, this.switchState);\n\n // Subscribe to key events but filter for space or enter.\n form.on('keydown', SELECTORS.MORELESSLINK, function(e) {\n // Enter or space.\n if (e.which == 13 || e.which == 32) {\n return this.switchState(e);\n }\n return true;\n }.bind(this));\n return this;\n };\n\n\n /**\n * Generates a uniq id for the dom element it's called on unless the element already has an id.\n * The id is set on the dom node before being returned.\n *\n * @method generateId\n * @param {JQuery} node JQuery selector representing a single DOM Node.\n * @return {String}\n */\n ShowAdvanced.prototype.generateId = function(node) {\n var id = node.prop('id');\n if (typeof id === 'undefined') {\n id = IDPREFIX + (uniqIdSeed++);\n node.prop('id', id);\n }\n return id;\n };\n\n /**\n * @method enhanceFieldset\n * @param {JQuery} fieldset JQuery selector representing a fieldset\n * @return {ShowAdvanced}\n */\n ShowAdvanced.prototype.enhanceFieldset = function(fieldset) {\n var statuselement = $('input[name=mform_showmore_' + fieldset.prop('id') + ']');\n if (!statuselement.length) {\n Log.debug(\"M.form.showadvanced::processFieldset was called on an fieldset without a status field: '\" +\n fieldset.prop('id') + \"'\");\n return this;\n }\n\n // Fetch some strings.\n Strings.get_strings([{\n key: 'showmore',\n component: 'core_form'\n }, {\n key: 'showless',\n component: 'core_form'\n }]).then(function(results) {\n var showmore = results[0],\n showless = results[1];\n\n // Generate more/less links.\n var morelesslink = $('<a href=\"#\"></a>');\n morelesslink.addClass(CSS.MORELESSTOGGLER);\n if (statuselement.val() === '0') {\n morelesslink.html(showmore);\n } else {\n morelesslink.html(showless);\n morelesslink.addClass(CSS.SHOWLESS);\n fieldset.find(SELECTORS.DIVFITEMADVANCED).addClass(CSS.SHOW);\n }\n // Build a list of advanced fieldsets.\n var idlist = [];\n fieldset.find(SELECTORS.DIVFITEMADVANCED).each(function(index, node) {\n idlist[idlist.length] = this.generateId($(node));\n }.bind(this));\n\n // Set aria attributes.\n morelesslink.attr('role', 'button');\n morelesslink.attr('aria-controls', idlist.join(' '));\n\n // Add elements to the DOM.\n var fitem = $(WRAPPERS.FITEM);\n fitem.addClass(CSS.MORELESSACTIONS);\n var felement = $(WRAPPERS.FELEMENT);\n felement.append(morelesslink);\n fitem.append(felement);\n\n fieldset.find(SELECTORS.DIVFCONTAINER).append(fitem);\n return true;\n }.bind(this)).fail(Notification.exception);\n\n return this;\n };\n\n /**\n * @method switchState\n * @param {Event} e Event that triggered this action.\n * @return {Boolean}\n */\n ShowAdvanced.prototype.switchState = function(e) {\n e.preventDefault();\n\n // Fetch some strings.\n Strings.get_strings([{\n key: 'showmore',\n component: 'core_form'\n }, {\n key: 'showless',\n component: 'core_form'\n }]).then(function(results) {\n var showmore = results[0],\n showless = results[1],\n fieldset = $(e.target).closest(SELECTORS.FIELDSETCONTAINSADVANCED);\n\n // Toggle collapsed class.\n fieldset.find(SELECTORS.DIVFITEMADVANCED).toggleClass(CSS.SHOW);\n\n // Get corresponding hidden variable.\n var statuselement = $('input[name=mform_showmore_' + fieldset.prop('id') + ']');\n\n // Invert it and change the link text.\n if (statuselement.val() === '0') {\n statuselement.val(1);\n $(e.target).addClass(CSS.SHOWLESS);\n $(e.target).html(showless);\n } else {\n statuselement.val(0);\n $(e.target).removeClass(CSS.SHOWLESS);\n $(e.target).html(showmore);\n }\n return true;\n }).fail(Notification.exception);\n\n return this;\n };\n\n return {\n /**\n * Initialise this module.\n * @method init\n * @param {String} formid\n * @return {ShowAdvanced}\n */\n init: function(formid) {\n return new ShowAdvanced(formid);\n }\n };\n});\n"],"file":"showadvanced.min.js"}