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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 * Autocomplete wrapper for select2 library.\n *\n * @module     core\/form-autocomplete\n * @class      autocomplete\n * @package    core\n * @copyright  2015 Damyon Wiese <damyon@moodle.com>\n * @license    http:\/\/www.gnu.org\/copyleft\/gpl.html GNU GPL v3 or later\n * @since      3.0\n *\/\n\/* globals require: false *\/\ndefine(\n    ['jquery', 'core\/log', 'core\/str', 'core\/templates', 'core\/notification', 'core\/loadingicon', 'core\/aria'],\nfunction($, log, str, templates, notification, LoadingIcon, Aria) {\n\n    \/\/ Private functions and variables.\n    \/** @var {Object} KEYS - List of keycode constants. *\/\n    var KEYS = {\n        DOWN: 40,\n        ENTER: 13,\n        SPACE: 32,\n        ESCAPE: 27,\n        COMMA: 44,\n        UP: 38,\n        LEFT: 37,\n        RIGHT: 39\n    };\n\n    var uniqueId = Date.now();\n\n    \/**\n     * Make an item in the selection list \"active\".\n     *\n     * @method activateSelection\n     * @private\n     * @param {Number} index The index in the current (visible) list of selection.\n     * @param {Object} state State variables for this autocomplete element.\n     * @return {Promise}\n     *\/\n    var activateSelection = function(index, state) {\n        \/\/ Find the elements in the DOM.\n        var selectionElement = $(document.getElementById(state.selectionId));\n\n        \/\/ Count the visible items.\n        var length = selectionElement.children('[aria-selected=true]').length;\n        \/\/ Limit the index to the upper\/lower bounds of the list (wrap in both directions).\n        index = index % length;\n        while (index < 0) {\n            index += length;\n        }\n        \/\/ Find the specified element.\n        var element = $(selectionElement.children('[aria-selected=true]').get(index));\n        \/\/ Create an id we can assign to this element.\n        var itemId = state.selectionId + '-' + index;\n\n        \/\/ Deselect all the selections.\n        selectionElement.children().attr('data-active-selection', null).attr('id', '');\n\n        \/\/ Select only this suggestion and assign it the id.\n        element.attr('data-active-selection', true).attr('id', itemId);\n\n        \/\/ Tell the input field it has a new active descendant so the item is announced.\n        selectionElement.attr('aria-activedescendant', itemId);\n        selectionElement.attr('data-active-value', element.attr('data-value'));\n\n        return $.Deferred().resolve();\n    };\n\n    \/**\n     * Get the actively selected element from the state object.\n     *\n     * @param   {Object} state\n     * @returns {jQuery}\n     *\/\n    var getActiveElementFromState = function(state) {\n        var selectionRegion = $(document.getElementById(state.selectionId));\n        var activeId = selectionRegion.attr('aria-activedescendant');\n\n        if (activeId) {\n            var activeElement = $(document.getElementById(activeId));\n            if (activeElement.length) {\n                \/\/ The active descendent still exists.\n                return activeElement;\n            }\n        }\n\n        var activeValue = selectionRegion.attr('data-active-value');\n        return selectionRegion.find('[data-value=\"' + activeValue + '\"]');\n    };\n\n    \/**\n     * Update the active selection from the given state object.\n     *\n     * @param   {Object} state\n     *\/\n    var updateActiveSelectionFromState = function(state) {\n        var activeElement = getActiveElementFromState(state);\n        var activeValue = activeElement.attr('data-value');\n\n        var selectionRegion = $(document.getElementById(state.selectionId));\n        if (activeValue) {\n            \/\/ Find the index of the currently selected index.\n            var activeIndex = selectionRegion.find('[aria-selected=true]').index(activeElement);\n\n            if (activeIndex !== -1) {\n                activateSelection(activeIndex, state);\n                return;\n            }\n        }\n\n        \/\/ Either the active index was not set, or it could not be found.\n        \/\/ Select the first value instead.\n        activateSelection(0, state);\n    };\n\n    \/**\n     * Update the element that shows the currently selected items.\n     *\n     * @method updateSelectionList\n     * @private\n     * @param {Object} options Original options for this autocomplete element.\n     * @param {Object} state State variables for this autocomplete element.\n     * @param {JQuery} originalSelect The JQuery object matching the hidden select list.\n     * @return {Promise}\n     *\/\n    var updateSelectionList = function(options, state, originalSelect) {\n        var pendingKey = 'form-autocomplete-updateSelectionList-' + state.inputId;\n        M.util.js_pending(pendingKey);\n\n        \/\/ Build up a valid context to re-render the template.\n        var items = [];\n        var newSelection = $(document.getElementById(state.selectionId));\n        originalSelect.children('option').each(function(index, ele) {\n            if ($(ele).prop('selected')) {\n                var label;\n                if ($(ele).data('html')) {\n                    label = $(ele).data('html');\n                } else {\n                    label = $(ele).html();\n                }\n                if (label !== '') {\n                    items.push({label: label, value: $(ele).attr('value')});\n                }\n            }\n        });\n\n        if (!hasItemListChanged(state, items)) {\n            M.util.js_complete(pendingKey);\n            return Promise.resolve();\n        }\n\n        state.items = items;\n\n        var context = $.extend(options, state);\n        \/\/ Render the template.\n        return templates.render(options.templates.items, context)\n        .then(function(html, js) {\n            \/\/ Add it to the page.\n            templates.replaceNodeContents(newSelection, html, js);\n\n            updateActiveSelectionFromState(state);\n\n            return;\n        })\n        .then(function() {\n            return M.util.js_complete(pendingKey);\n        })\n        .catch(notification.exception);\n    };\n\n    \/**\n     * Check whether the list of items stored in the state has changed.\n     *\n     * @param   {Object} state\n     * @param   {Array} items\n     *\/\n    var hasItemListChanged = function(state, items) {\n        if (state.items.length !== items.length) {\n            return true;\n        }\n\n        \/\/ Check for any items in the state items which are not present in the new items list.\n        return state.items.filter(item => items.indexOf(item) === -1).length > 0;\n    };\n\n    \/**\n     * Notify of a change in the selection.\n     *\n     * @param {jQuery} originalSelect The jQuery object matching the hidden select list.\n     *\/\n    var notifyChange = function(originalSelect) {\n        if (typeof M.core_formchangechecker !== 'undefined') {\n            M.core_formchangechecker.set_form_changed();\n        }\n\n        \/\/ Note, jQuery .change() was not working here. Better to\n        \/\/ use plain JavaScript anyway.\n        originalSelect[0].dispatchEvent(new Event('change'));\n    };\n\n    \/**\n     * Remove the given item from the list of selected things.\n     *\n     * @method deselectItem\n     * @private\n     * @param {Object} options Original options for this autocomplete element.\n     * @param {Object} state State variables for this autocomplete element.\n     * @param {Element} item The item to be deselected.\n     * @param {Element} originalSelect The original select list.\n     * @return {Promise}\n     *\/\n    var deselectItem = function(options, state, item, originalSelect) {\n        var selectedItemValue = $(item).attr('data-value');\n\n        \/\/ Look for a match, and toggle the selected property if there is a match.\n        originalSelect.children('option').each(function(index, ele) {\n            if ($(ele).attr('value') == selectedItemValue) {\n                $(ele).prop('selected', false);\n                \/\/ We remove newly created custom tags from the suggestions list when they are deselected.\n                if ($(ele).attr('data-iscustom')) {\n                    $(ele).remove();\n                }\n            }\n        });\n        \/\/ Rerender the selection list.\n        return updateSelectionList(options, state, originalSelect)\n        .then(function() {\n            \/\/ Notify that the selection changed.\n            notifyChange(originalSelect);\n\n            return;\n        });\n    };\n\n    \/**\n     * Make an item in the suggestions \"active\" (about to be selected).\n     *\n     * @method activateItem\n     * @private\n     * @param {Number} index The index in the current (visible) list of suggestions.\n     * @param {Object} state State variables for this instance of autocomplete.\n     * @return {Promise}\n     *\/\n    var activateItem = function(index, state) {\n        \/\/ Find the elements in the DOM.\n        var inputElement = $(document.getElementById(state.inputId));\n        var suggestionsElement = $(document.getElementById(state.suggestionsId));\n\n        \/\/ Count the visible items.\n        var length = suggestionsElement.children(':not([aria-hidden])').length;\n        \/\/ Limit the index to the upper\/lower bounds of the list (wrap in both directions).\n        index = index % length;\n        while (index < 0) {\n            index += length;\n        }\n        \/\/ Find the specified element.\n        var element = $(suggestionsElement.children(':not([aria-hidden])').get(index));\n        \/\/ Find the index of this item in the full list of suggestions (including hidden).\n        var globalIndex = $(suggestionsElement.children('[role=option]')).index(element);\n        \/\/ Create an id we can assign to this element.\n        var itemId = state.suggestionsId + '-' + globalIndex;\n\n        \/\/ Deselect all the suggestions.\n        suggestionsElement.children().attr('aria-selected', false).attr('id', '');\n        \/\/ Select only this suggestion and assign it the id.\n        element.attr('aria-selected', true).attr('id', itemId);\n        \/\/ Tell the input field it has a new active descendant so the item is announced.\n        inputElement.attr('aria-activedescendant', itemId);\n\n        \/\/ Scroll it into view.\n        var scrollPos = element.offset().top\n                       - suggestionsElement.offset().top\n                       + suggestionsElement.scrollTop()\n                       - (suggestionsElement.height() \/ 2);\n        return suggestionsElement.animate({\n            scrollTop: scrollPos\n        }, 100).promise();\n    };\n\n    \/**\n     * Find the index of the current active suggestion, and activate the next one.\n     *\n     * @method activateNextItem\n     * @private\n     * @param {Object} state State variable for this auto complete element.\n     * @return {Promise}\n     *\/\n    var activateNextItem = function(state) {\n        \/\/ Find the list of suggestions.\n        var suggestionsElement = $(document.getElementById(state.suggestionsId));\n        \/\/ Find the active one.\n        var element = suggestionsElement.children('[aria-selected=true]');\n        \/\/ Find it's index.\n        var current = suggestionsElement.children(':not([aria-hidden])').index(element);\n        \/\/ Activate the next one.\n        return activateItem(current + 1, state);\n    };\n\n    \/**\n     * Find the index of the current active selection, and activate the previous one.\n     *\n     * @method activatePreviousSelection\n     * @private\n     * @param {Object} state State variables for this instance of autocomplete.\n     * @return {Promise}\n     *\/\n    var activatePreviousSelection = function(state) {\n        \/\/ Find the list of selections.\n        var selectionsElement = $(document.getElementById(state.selectionId));\n        \/\/ Find the active one.\n        var element = selectionsElement.children('[data-active-selection]');\n        if (!element) {\n            return activateSelection(0, state);\n        }\n        \/\/ Find it's index.\n        var current = selectionsElement.children('[aria-selected=true]').index(element);\n        \/\/ Activate the next one.\n        return activateSelection(current - 1, state);\n    };\n\n    \/**\n     * Find the index of the current active selection, and activate the next one.\n     *\n     * @method activateNextSelection\n     * @private\n     * @param {Object} state State variables for this instance of autocomplete.\n     * @return {Promise}\n     *\/\n    var activateNextSelection = function(state) {\n        \/\/ Find the list of selections.\n        var selectionsElement = $(document.getElementById(state.selectionId));\n\n        \/\/ Find the active one.\n        var element = selectionsElement.children('[data-active-selection]');\n        var current = 0;\n\n        if (element) {\n            \/\/ The element was found. Determine the index and move to the next one.\n            current = selectionsElement.children('[aria-selected=true]').index(element);\n            current = current + 1;\n        } else {\n            \/\/ No selected item found. Move to the first.\n            current = 0;\n        }\n\n        return activateSelection(current, state);\n    };\n\n    \/**\n     * Find the index of the current active suggestion, and activate the previous one.\n     *\n     * @method activatePreviousItem\n     * @private\n     * @param {Object} state State variables for this autocomplete element.\n     * @return {Promise}\n     *\/\n    var activatePreviousItem = function(state) {\n        \/\/ Find the list of suggestions.\n        var suggestionsElement = $(document.getElementById(state.suggestionsId));\n\n        \/\/ Find the active one.\n        var element = suggestionsElement.children('[aria-selected=true]');\n\n        \/\/ Find it's index.\n        var current = suggestionsElement.children(':not([aria-hidden])').index(element);\n\n        \/\/ Activate the previous one.\n        return activateItem(current - 1, state);\n    };\n\n    \/**\n     * Close the list of suggestions.\n     *\n     * @method closeSuggestions\n     * @private\n     * @param {Object} state State variables for this autocomplete element.\n     * @return {Promise}\n     *\/\n    var closeSuggestions = function(state) {\n        \/\/ Find the elements in the DOM.\n        var inputElement = $(document.getElementById(state.inputId));\n        var suggestionsElement = $(document.getElementById(state.suggestionsId));\n\n        if (inputElement.attr('aria-expanded') === \"true\") {\n            \/\/ Announce the list of suggestions was closed.\n            inputElement.attr('aria-expanded', false);\n        }\n        \/\/ Read the current list of selections.\n        inputElement.attr('aria-activedescendant', state.selectionId);\n\n        \/\/ Hide the suggestions list (from screen readers too).\n        Aria.hide(suggestionsElement.get());\n        suggestionsElement.hide();\n\n        return $.Deferred().resolve();\n    };\n\n    \/**\n     * Rebuild the list of suggestions based on the current values in the select list, and the query.\n     *\n     * @method updateSuggestions\n     * @private\n     * @param {Object} options The original options for this autocomplete.\n     * @param {Object} state The state variables for this autocomplete.\n     * @param {String} query The current text for the search string.\n     * @param {JQuery} originalSelect The JQuery object matching the hidden select list.\n     * @return {Promise}\n     *\/\n    var updateSuggestions = function(options, state, query, originalSelect) {\n        var pendingKey = 'form-autocomplete-updateSuggestions-' + state.inputId;\n        M.util.js_pending(pendingKey);\n\n        \/\/ Find the elements in the DOM.\n        var inputElement = $(document.getElementById(state.inputId));\n        var suggestionsElement = $(document.getElementById(state.suggestionsId));\n\n        \/\/ Used to track if we found any visible suggestions.\n        var matchingElements = false;\n        \/\/ Options is used by the context when rendering the suggestions from a template.\n        var suggestions = [];\n        originalSelect.children('option').each(function(index, option) {\n            if ($(option).prop('selected') !== true) {\n                suggestions[suggestions.length] = {label: option.innerHTML, value: $(option).attr('value')};\n            }\n        });\n\n        \/\/ Re-render the list of suggestions.\n        var searchquery = state.caseSensitive ? query : query.toLocaleLowerCase();\n        var context = $.extend({options: suggestions}, options, state);\n        var returnVal = templates.render(\n            'core\/form_autocomplete_suggestions',\n            context\n        )\n        .then(function(html, js) {\n            \/\/ We have the new template, insert it in the page.\n            templates.replaceNode(suggestionsElement, html, js);\n\n            \/\/ Get the element again.\n            suggestionsElement = $(document.getElementById(state.suggestionsId));\n\n            \/\/ Show it if it is hidden.\n            Aria.unhide(suggestionsElement.get());\n            suggestionsElement.show();\n\n            \/\/ For each option in the list, hide it if it doesn't match the query.\n            suggestionsElement.children().each(function(index, node) {\n                node = $(node);\n                if ((options.caseSensitive && node.text().indexOf(searchquery) > -1) ||\n                        (!options.caseSensitive && node.text().toLocaleLowerCase().indexOf(searchquery) > -1)) {\n                    Aria.unhide(node.get());\n                    node.show();\n                    matchingElements = true;\n                } else {\n                    node.hide();\n                    Aria.hide(node.get());\n                }\n            });\n            \/\/ If we found any matches, show the list.\n            inputElement.attr('aria-expanded', true);\n            if (originalSelect.attr('data-notice')) {\n                \/\/ Display a notice rather than actual suggestions.\n                suggestionsElement.html(originalSelect.attr('data-notice'));\n            } else if (matchingElements) {\n                \/\/ We only activate the first item in the list if tags is false,\n                \/\/ because otherwise \"Enter\" would select the first item, instead of\n                \/\/ creating a new tag.\n                if (!options.tags) {\n                    activateItem(0, state);\n                }\n            } else {\n                \/\/ Nothing matches. Tell them that.\n                str.get_string('nosuggestions', 'form').done(function(nosuggestionsstr) {\n                    suggestionsElement.html(nosuggestionsstr);\n                });\n            }\n\n            return suggestionsElement;\n        })\n        .then(function() {\n            return M.util.js_complete(pendingKey);\n        })\n        .catch(notification.exception);\n\n        return returnVal;\n    };\n\n    \/**\n     * Create a new item for the list (a tag).\n     *\n     * @method createItem\n     * @private\n     * @param {Object} options The original options for the autocomplete.\n     * @param {Object} state State variables for the autocomplete.\n     * @param {JQuery} originalSelect The JQuery object matching the hidden select list.\n     * @return {Promise}\n     *\/\n    var createItem = function(options, state, originalSelect) {\n        \/\/ Find the element in the DOM.\n        var inputElement = $(document.getElementById(state.inputId));\n        \/\/ Get the current text in the input field.\n        var query = inputElement.val();\n        var tags = query.split(',');\n        var found = false;\n\n        $.each(tags, function(tagindex, tag) {\n            \/\/ If we can only select one at a time, deselect any current value.\n            tag = tag.trim();\n            if (tag !== '') {\n                if (!options.multiple) {\n                    originalSelect.children('option').prop('selected', false);\n                }\n                \/\/ Look for an existing option in the select list that matches this new tag.\n                originalSelect.children('option').each(function(index, ele) {\n                    if ($(ele).attr('value') == tag) {\n                        found = true;\n                        $(ele).prop('selected', true);\n                    }\n                });\n                \/\/ Only create the item if it's new.\n                if (!found) {\n                    var option = $('<option>');\n                    option.append(document.createTextNode(tag));\n                    option.attr('value', tag);\n                    originalSelect.append(option);\n                    option.prop('selected', true);\n                    \/\/ We mark newly created custom options as we handle them differently if they are \"deselected\".\n                    option.attr('data-iscustom', true);\n                }\n            }\n        });\n\n        return updateSelectionList(options, state, originalSelect)\n        .then(function() {\n            \/\/ Notify that the selection changed.\n            notifyChange(originalSelect);\n\n            return;\n        })\n        .then(function() {\n            \/\/ Clear the input field.\n            inputElement.val('');\n\n            return;\n        })\n        .then(function() {\n            \/\/ Close the suggestions list.\n            return closeSuggestions(state);\n        });\n    };\n\n    \/**\n     * Select the currently active item from the suggestions list.\n     *\n     * @method selectCurrentItem\n     * @private\n     * @param {Object} options The original options for the autocomplete.\n     * @param {Object} state State variables for the autocomplete.\n     * @param {JQuery} originalSelect The JQuery object matching the hidden select list.\n     * @return {Promise}\n     *\/\n    var selectCurrentItem = function(options, state, originalSelect) {\n        \/\/ Find the elements in the page.\n        var inputElement = $(document.getElementById(state.inputId));\n        var suggestionsElement = $(document.getElementById(state.suggestionsId));\n        \/\/ Here loop through suggestions and set val to join of all selected items.\n\n        var selectedItemValue = suggestionsElement.children('[aria-selected=true]').attr('data-value');\n        \/\/ The select will either be a single or multi select, so the following will either\n        \/\/ select one or more items correctly.\n        \/\/ Take care to use 'prop' and not 'attr' for selected properties.\n        \/\/ If only one can be selected at a time, start by deselecting everything.\n        if (!options.multiple) {\n            originalSelect.children('option').prop('selected', false);\n        }\n        \/\/ Look for a match, and toggle the selected property if there is a match.\n        originalSelect.children('option').each(function(index, ele) {\n            if ($(ele).attr('value') == selectedItemValue) {\n                $(ele).prop('selected', true);\n            }\n        });\n\n        return updateSelectionList(options, state, originalSelect)\n        .then(function() {\n            \/\/ Notify that the selection changed.\n            notifyChange(originalSelect);\n\n            return;\n        })\n        .then(function() {\n            if (options.closeSuggestionsOnSelect) {\n                \/\/ Clear the input element.\n                inputElement.val('');\n                \/\/ Close the list of suggestions.\n                return closeSuggestions(state);\n            } else {\n                \/\/ Focus on the input element so the suggestions does not auto-close.\n                inputElement.focus();\n                \/\/ Remove the last selected item from the suggestions list.\n                return updateSuggestions(options, state, inputElement.val(), originalSelect);\n            }\n        });\n    };\n\n    \/**\n     * Fetch a new list of options via ajax.\n     *\n     * @method updateAjax\n     * @private\n     * @param {Event} e The event that triggered this update.\n     * @param {Object} options The original options for the autocomplete.\n     * @param {Object} state The state variables for the autocomplete.\n     * @param {JQuery} originalSelect The JQuery object matching the hidden select list.\n     * @param {Object} ajaxHandler This is a module that does the ajax fetch and translates the results.\n     * @return {Promise}\n     *\/\n    var updateAjax = function(e, options, state, originalSelect, ajaxHandler) {\n        var pendingPromise = addPendingJSPromise('updateAjax');\n        \/\/ We need to show the indicator outside of the hidden select list.\n        \/\/ So we get the parent id of the hidden select list.\n        var parentElement = $(document.getElementById(state.selectId)).parent();\n        LoadingIcon.addIconToContainerRemoveOnCompletion(parentElement, pendingPromise);\n\n        \/\/ Get the query to pass to the ajax function.\n        var query = $(e.currentTarget).val();\n        \/\/ Call the transport function to do the ajax (name taken from Select2).\n        ajaxHandler.transport(options.selector, query, function(results) {\n            \/\/ We got a result - pass it through the translator before using it.\n            var processedResults = ajaxHandler.processResults(options.selector, results);\n            var existingValues = [];\n\n            \/\/ Now destroy all options that are not currently selected.\n            if (!options.multiple) {\n                originalSelect.children('option').remove();\n            }\n            originalSelect.children('option').each(function(optionIndex, option) {\n                option = $(option);\n                if (!option.prop('selected')) {\n                    option.remove();\n                } else {\n                    existingValues.push(String(option.attr('value')));\n                }\n            });\n\n            if (!options.multiple && originalSelect.children('option').length === 0) {\n                \/\/ If this is a single select - and there are no current options\n                \/\/ the first option added will be selected by the browser. This causes a bug!\n                \/\/ We need to insert an empty option so that none of the real options are selected.\n                var option = $('<option>');\n                originalSelect.append(option);\n            }\n            if ($.isArray(processedResults)) {\n                \/\/ Add all the new ones returned from ajax.\n                $.each(processedResults, function(resultIndex, result) {\n                    if (existingValues.indexOf(String(result.value)) === -1) {\n                        var option = $('<option>');\n                        option.append(result.label);\n                        option.attr('value', result.value);\n                        originalSelect.append(option);\n                    }\n                });\n                originalSelect.attr('data-notice', '');\n            } else {\n                \/\/ The AJAX handler returned a string instead of the array.\n                originalSelect.attr('data-notice', processedResults);\n            }\n            \/\/ Update the list of suggestions now from the new values in the select list.\n            pendingPromise.resolve(updateSuggestions(options, state, '', originalSelect));\n        }, function(error) {\n            pendingPromise.reject(error);\n        });\n\n        return pendingPromise;\n    };\n\n    \/**\n     * Add all the event listeners required for keyboard nav, blur clicks etc.\n     *\n     * @method addNavigation\n     * @private\n     * @param {Object} options The options used to create this autocomplete element.\n     * @param {Object} state State variables for this autocomplete element.\n     * @param {JQuery} originalSelect The JQuery object matching the hidden select list.\n     *\/\n    var addNavigation = function(options, state, originalSelect) {\n        \/\/ Start with the input element.\n        var inputElement = $(document.getElementById(state.inputId));\n        \/\/ Add keyboard nav with keydown.\n        inputElement.on('keydown', function(e) {\n            var pendingJsPromise = addPendingJSPromise('addNavigation-' + state.inputId + '-' + e.keyCode);\n\n            switch (e.keyCode) {\n                case KEYS.DOWN:\n                    \/\/ If the suggestion list is open, move to the next item.\n                    if (!options.showSuggestions) {\n                        \/\/ Do not consume this event.\n                        pendingJsPromise.resolve();\n                        return true;\n                    } else if (inputElement.attr('aria-expanded') === \"true\") {\n                        pendingJsPromise.resolve(activateNextItem(state));\n                    } else {\n                        \/\/ Handle ajax population of suggestions.\n                        if (!inputElement.val() && options.ajax) {\n                            require([options.ajax], function(ajaxHandler) {\n                                pendingJsPromise.resolve(updateAjax(e, options, state, originalSelect, ajaxHandler));\n                            });\n                        } else {\n                            \/\/ Open the suggestions list.\n                            pendingJsPromise.resolve(updateSuggestions(options, state, inputElement.val(), originalSelect));\n                        }\n                    }\n                    \/\/ We handled this event, so prevent it.\n                    e.preventDefault();\n                    return false;\n                case KEYS.UP:\n                    \/\/ Choose the previous active item.\n                    pendingJsPromise.resolve(activatePreviousItem(state));\n\n                    \/\/ We handled this event, so prevent it.\n                    e.preventDefault();\n                    return false;\n                case KEYS.ENTER:\n                    var suggestionsElement = $(document.getElementById(state.suggestionsId));\n                    if ((inputElement.attr('aria-expanded') === \"true\") &&\n                            (suggestionsElement.children('[aria-selected=true]').length > 0)) {\n                        \/\/ If the suggestion list has an active item, select it.\n                        pendingJsPromise.resolve(selectCurrentItem(options, state, originalSelect));\n                    } else if (options.tags) {\n                        \/\/ If tags are enabled, create a tag.\n                        pendingJsPromise.resolve(createItem(options, state, originalSelect));\n                    } else {\n                        pendingJsPromise.resolve();\n                    }\n\n                    \/\/ We handled this event, so prevent it.\n                    e.preventDefault();\n                    return false;\n                case KEYS.ESCAPE:\n                    if (inputElement.attr('aria-expanded') === \"true\") {\n                        \/\/ If the suggestion list is open, close it.\n                        pendingJsPromise.resolve(closeSuggestions(state));\n                    } else {\n                        pendingJsPromise.resolve();\n                    }\n                    \/\/ We handled this event, so prevent it.\n                    e.preventDefault();\n                    return false;\n            }\n            pendingJsPromise.resolve();\n            return true;\n        });\n        \/\/ Support multi lingual COMMA keycode (44).\n        inputElement.on('keypress', function(e) {\n\n            if (e.keyCode === KEYS.COMMA) {\n                if (options.tags) {\n                    \/\/ If we are allowing tags, comma should create a tag (or enter).\n                    addPendingJSPromise('keypress-' + e.keyCode)\n                    .resolve(createItem(options, state, originalSelect));\n                }\n                \/\/ We handled this event, so prevent it.\n                e.preventDefault();\n                return false;\n            }\n            return true;\n        });\n        \/\/ Support submitting the form without leaving the autocomplete element,\n        \/\/ or submitting too quick before the blur handler action is completed.\n        inputElement.closest('form').on('submit', function() {\n            if (options.tags) {\n                \/\/ If tags are enabled, create a tag.\n                addPendingJSPromise('form-autocomplete-submit')\n                .resolve(createItem(options, state, originalSelect));\n            }\n\n            return true;\n        });\n        inputElement.on('blur', function() {\n            var pendingPromise = addPendingJSPromise('form-autocomplete-blur');\n            window.setTimeout(function() {\n                \/\/ Get the current element with focus.\n                var focusElement = $(document.activeElement);\n                var timeoutPromise = $.Deferred();\n\n                \/\/ Only close the menu if the input hasn't regained focus and if the element still exists,\n                \/\/ and regain focus if the scrollbar is clicked.\n                \/\/ Due to the half a second delay, it is possible that the input element no longer exist\n                \/\/ by the time this code is being executed.\n                if (focusElement.is(document.getElementById(state.suggestionsId))) {\n                    inputElement.focus(); \/\/ Probably the scrollbar is clicked. Regain focus.\n                } else if (!focusElement.is(inputElement) && $(document.getElementById(state.inputId)).length) {\n                    if (options.tags) {\n                        timeoutPromise.then(function() {\n                            return createItem(options, state, originalSelect);\n                        })\n                        .catch();\n                    }\n                    timeoutPromise.then(function() {\n                        return closeSuggestions(state);\n                    })\n                    .catch();\n                }\n\n                timeoutPromise.then(function() {\n                    return pendingPromise.resolve();\n                })\n                .catch();\n                timeoutPromise.resolve();\n            }, 500);\n        });\n        if (options.showSuggestions) {\n            var arrowElement = $(document.getElementById(state.downArrowId));\n            arrowElement.on('click', function(e) {\n                var pendingPromise = addPendingJSPromise('form-autocomplete-show-suggestions');\n\n                \/\/ Prevent the close timer, or we will open, then close the suggestions.\n                inputElement.focus();\n\n                \/\/ Handle ajax population of suggestions.\n                if (!inputElement.val() && options.ajax) {\n                    require([options.ajax], function(ajaxHandler) {\n                        pendingPromise.resolve(updateAjax(e, options, state, originalSelect, ajaxHandler));\n                    });\n                } else {\n                    \/\/ Else - open the suggestions list.\n                    pendingPromise.resolve(updateSuggestions(options, state, inputElement.val(), originalSelect));\n                }\n            });\n        }\n\n        var suggestionsElement = $(document.getElementById(state.suggestionsId));\n        \/\/ Remove any click handler first.\n        suggestionsElement.parent().prop(\"onclick\", null).off(\"click\");\n        suggestionsElement.parent().on('click', `#${state.suggestionsId} [role=option]`, function(e) {\n            var pendingPromise = addPendingJSPromise('form-autocomplete-parent');\n            \/\/ Handle clicks on suggestions.\n            var element = $(e.currentTarget).closest('[role=option]');\n            var suggestionsElement = $(document.getElementById(state.suggestionsId));\n            \/\/ Find the index of the clicked on suggestion.\n            var current = suggestionsElement.children(':not([aria-hidden])').index(element);\n\n            \/\/ Activate it.\n            activateItem(current, state)\n            .then(function() {\n                \/\/ And select it.\n                return selectCurrentItem(options, state, originalSelect);\n            })\n            .then(function() {\n                return pendingPromise.resolve();\n            })\n            .catch();\n        });\n        var selectionElement = $(document.getElementById(state.selectionId));\n\n        \/\/ Handle clicks on the selected items (will unselect an item).\n        selectionElement.on('click', '[role=option]', function(e) {\n            var pendingPromise = addPendingJSPromise('form-autocomplete-clicks');\n\n            \/\/ Remove it from the selection.\n            pendingPromise.resolve(deselectItem(options, state, $(e.currentTarget), originalSelect));\n        });\n\n        \/\/ When listbox is focused, focus on the first option if there is no focused option.\n        selectionElement.on('focus', function() {\n            updateActiveSelectionFromState(state);\n        });\n\n        \/\/ Keyboard navigation for the selection list.\n        selectionElement.on('keydown', function(e) {\n            var pendingPromise = addPendingJSPromise('form-autocomplete-keydown-' + e.keyCode);\n            switch (e.keyCode) {\n                case KEYS.RIGHT:\n                case KEYS.DOWN:\n                    \/\/ We handled this event, so prevent it.\n                    e.preventDefault();\n\n                    \/\/ Choose the next selection item.\n                    pendingPromise.resolve(activateNextSelection(state));\n                    return;\n                case KEYS.LEFT:\n                case KEYS.UP:\n                    \/\/ We handled this event, so prevent it.\n                    e.preventDefault();\n\n                    \/\/ Choose the previous selection item.\n                    pendingPromise.resolve(activatePreviousSelection(state));\n                    return;\n                case KEYS.SPACE:\n                case KEYS.ENTER:\n                    \/\/ Get the item that is currently selected.\n                    var selectedItem = $(document.getElementById(state.selectionId)).children('[data-active-selection]');\n                    if (selectedItem) {\n                        e.preventDefault();\n\n                        \/\/ Unselect this item.\n                        pendingPromise.resolve(deselectItem(options, state, selectedItem, originalSelect));\n                    }\n                    return;\n            }\n\n            \/\/ Not handled. Resolve the promise.\n            pendingPromise.resolve();\n        });\n        \/\/ Whenever the input field changes, update the suggestion list.\n        if (options.showSuggestions) {\n            \/\/ Store the value of the field as its last value, when the field gains focus.\n            inputElement.on('focus', function(e) {\n                var query = $(e.currentTarget).val();\n                $(e.currentTarget).data('last-value', query);\n            });\n\n            \/\/ If this field uses ajax, set it up.\n            if (options.ajax) {\n                require([options.ajax], function(ajaxHandler) {\n                    \/\/ Creating throttled handlers free of race conditions, and accurate.\n                    \/\/ This code keeps track of a throttleTimeout, which is periodically polled.\n                    \/\/ Once the throttled function is executed, the fact that it is running is noted.\n                    \/\/ If a subsequent request comes in whilst it is running, this request is re-applied.\n                    var throttleTimeout = null;\n                    var inProgress = false;\n                    var pendingKey = 'autocomplete-throttledhandler';\n                    var handler = function(e) {\n                        \/\/ Empty the current timeout.\n                        throttleTimeout = null;\n\n                        \/\/ Mark this request as in-progress.\n                        inProgress = true;\n\n                        \/\/ Process the request.\n                        updateAjax(e, options, state, originalSelect, ajaxHandler)\n                        .then(function() {\n                            \/\/ Check if the throttleTimeout is still empty.\n                            \/\/ There's a potential condition whereby the JS request takes long enough to complete that\n                            \/\/ another task has been queued.\n                            \/\/ In this case another task will be kicked off and we must wait for that before marking htis as\n                            \/\/ complete.\n                            if (null === throttleTimeout) {\n                                \/\/ Mark this task as complete.\n                                M.util.js_complete(pendingKey);\n                            }\n                            inProgress = false;\n\n                            return arguments[0];\n                        })\n                        .catch(notification.exception);\n                    };\n\n                    \/\/ For input events, we do not want to trigger many, many updates.\n                    var throttledHandler = function(e) {\n                        window.clearTimeout(throttleTimeout);\n                        if (inProgress) {\n                            \/\/ A request is currently ongoing.\n                            \/\/ Delay this request another 100ms.\n                            throttleTimeout = window.setTimeout(throttledHandler.bind(this, e), 100);\n                            return;\n                        }\n\n                        if (throttleTimeout === null) {\n                            \/\/ There is currently no existing timeout handler, and it has not been recently cleared, so\n                            \/\/ this is the start of a throttling check.\n                            M.util.js_pending(pendingKey);\n                        }\n\n                        \/\/ There is currently no existing timeout handler, and it has not been recently cleared, so this\n                        \/\/ is the start of a throttling check.\n                        \/\/ Queue a call to the handler.\n                        throttleTimeout = window.setTimeout(handler.bind(this, e), 300);\n                    };\n\n                    \/\/ Trigger an ajax update after the text field value changes.\n                    inputElement.on('input', function(e) {\n                        var query = $(e.currentTarget).val();\n                        var last = $(e.currentTarget).data('last-value');\n                        \/\/ IE11 fires many more input events than required - even when the value has not changed.\n                        if (last !== query) {\n                            throttledHandler(e);\n                        }\n                        $(e.currentTarget).data('last-value', query);\n                    });\n                });\n            } else {\n                inputElement.on('input', function(e) {\n                    var query = $(e.currentTarget).val();\n                    var last = $(e.currentTarget).data('last-value');\n                    \/\/ IE11 fires many more input events than required - even when the value has not changed.\n                    \/\/ We need to only do this for real value changed events or the suggestions will be\n                    \/\/ unclickable on IE11 (because they will be rebuilt before the click event fires).\n                    \/\/ Note - because of this we cannot close the list when the query is empty or it will break\n                    \/\/ on IE11.\n                    if (last !== query) {\n                        updateSuggestions(options, state, query, originalSelect);\n                    }\n                    $(e.currentTarget).data('last-value', query);\n                });\n            }\n        }\n    };\n\n    \/**\n     * Create and return an unresolved Promise for some pending JS.\n     *\n     * @param   {String} key The unique identifier for this promise\n     * @return  {Promise}\n     *\/\n    var addPendingJSPromise = function(key) {\n            var pendingKey = 'form-autocomplete:' + key;\n\n            M.util.js_pending(pendingKey);\n\n            var pendingPromise = $.Deferred();\n\n            pendingPromise\n            .then(function() {\n                M.util.js_complete(pendingKey);\n\n                return arguments[0];\n            })\n            .catch(notification.exception);\n\n            return pendingPromise;\n    };\n\n    return \/** @alias module:core\/form-autocomplete *\/ {\n        \/\/ Public variables and functions.\n        \/**\n         * Turn a boring select box into an auto-complete beast.\n         *\n         * @method enhance\n         * @param {string} selector The selector that identifies the select box.\n         * @param {boolean} tags Whether to allow support for tags (can define new entries).\n         * @param {string} ajax Name of an AMD module to handle ajax requests. If specified, the AMD\n         *                      module must expose 2 functions \"transport\" and \"processResults\".\n         *                      These are modeled on Select2 see: https:\/\/select2.github.io\/options.html#ajax\n         * @param {String} placeholder - The text to display before a selection is made.\n         * @param {Boolean} caseSensitive - If search has to be made case sensitive.\n         * @param {Boolean} showSuggestions - If suggestions should be shown\n         * @param {String} noSelectionString - Text to display when there is no selection\n         * @param {Boolean} closeSuggestionsOnSelect - Whether to close the suggestions immediately after making a selection.\n         * @param {Object} templateOverrides A set of templates to use instead of the standard templates\n         * @return {Promise}\n         *\/\n        enhance: function(selector, tags, ajax, placeholder, caseSensitive, showSuggestions, noSelectionString,\n                          closeSuggestionsOnSelect, templateOverrides) {\n            \/\/ Set some default values.\n            var options = {\n                selector: selector,\n                tags: false,\n                ajax: false,\n                placeholder: placeholder,\n                caseSensitive: false,\n                showSuggestions: true,\n                noSelectionString: noSelectionString,\n                templates: $.extend({\n                        input: 'core\/form_autocomplete_input',\n                        items: 'core\/form_autocomplete_selection_items',\n                        layout: 'core\/form_autocomplete_layout',\n                        selection: 'core\/form_autocomplete_selection',\n                        suggestions: 'core\/form_autocomplete_suggestions',\n                    }, templateOverrides),\n            };\n            var pendingKey = 'autocomplete-setup-' + selector;\n            M.util.js_pending(pendingKey);\n            if (typeof tags !== \"undefined\") {\n                options.tags = tags;\n            }\n            if (typeof ajax !== \"undefined\") {\n                options.ajax = ajax;\n            }\n            if (typeof caseSensitive !== \"undefined\") {\n                options.caseSensitive = caseSensitive;\n            }\n            if (typeof showSuggestions !== \"undefined\") {\n                options.showSuggestions = showSuggestions;\n            }\n            if (typeof noSelectionString === \"undefined\") {\n                str.get_string('noselection', 'form').done(function(result) {\n                    options.noSelectionString = result;\n                }).fail(notification.exception);\n            }\n\n            \/\/ Look for the select element.\n            var originalSelect = $(selector);\n            if (!originalSelect) {\n                log.debug('Selector not found: ' + selector);\n                M.util.js_complete(pendingKey);\n                return false;\n            }\n\n            Aria.hide(originalSelect.get());\n            originalSelect.css('visibility', 'hidden');\n\n            \/\/ Hide the original select.\n\n            \/\/ Find or generate some ids.\n            var state = {\n                selectId: originalSelect.attr('id'),\n                inputId: 'form_autocomplete_input-' + uniqueId,\n                suggestionsId: 'form_autocomplete_suggestions-' + uniqueId,\n                selectionId: 'form_autocomplete_selection-' + uniqueId,\n                downArrowId: 'form_autocomplete_downarrow-' + uniqueId,\n                items: [],\n            };\n\n            \/\/ Increment the unique counter so we don't get duplicates ever.\n            uniqueId++;\n\n            options.multiple = originalSelect.attr('multiple');\n            if (!options.multiple) {\n                \/\/ If this is a single select then there is no way to de-select the current value -\n                \/\/ unless we add a bogus blank option to be selected when nothing else is.\n                \/\/ This matches similar code in updateAjax above.\n                originalSelect.prepend('<option>');\n            }\n\n            if (typeof closeSuggestionsOnSelect !== \"undefined\") {\n                options.closeSuggestionsOnSelect = closeSuggestionsOnSelect;\n            } else {\n                \/\/ If not specified, this will close suggestions by default for single-select elements only.\n                options.closeSuggestionsOnSelect = !options.multiple;\n            }\n\n            var originalLabel = $('[for=' + state.selectId + ']');\n            \/\/ Create the new markup and insert it after the select.\n            var suggestions = [];\n            originalSelect.children('option').each(function(index, option) {\n                suggestions[index] = {label: option.innerHTML, value: $(option).attr('value')};\n            });\n\n            \/\/ Render all the parts of our UI.\n            var context = $.extend({}, options, state);\n            context.options = suggestions;\n            context.items = [];\n\n            \/\/ Collect rendered inline JS to be executed once the HTML is shown.\n            var collectedjs = '';\n\n            var renderLayout = templates.render(options.templates.layout, {})\n            .then(function(html) {\n                return $(html);\n            });\n\n            var renderInput = templates.render(options.templates.input, context).then(function(html, js) {\n                collectedjs += js;\n                return $(html);\n            });\n\n            var renderDatalist = templates.render(options.templates.suggestions, context).then(function(html, js) {\n                collectedjs += js;\n                return $(html);\n            });\n\n            var renderSelection = templates.render(options.templates.selection, context).then(function(html, js) {\n                collectedjs += js;\n                return $(html);\n            });\n\n            return $.when(renderLayout, renderInput, renderDatalist, renderSelection)\n            .then(function(layout, input, suggestions, selection) {\n                originalSelect.hide();\n                var container = originalSelect.parent();\n\n                \/\/ Ensure that the data-fieldtype is set for behat.\n                $(input).find('input').attr('data-fieldtype', 'autocomplete');\n\n                container.append(layout);\n                container.find('[data-region=\"form_autocomplete-input\"]').replaceWith(input);\n                container.find('[data-region=\"form_autocomplete-suggestions\"]').replaceWith(suggestions);\n                container.find('[data-region=\"form_autocomplete-selection\"]').replaceWith(selection);\n\n                templates.runTemplateJS(collectedjs);\n\n                \/\/ Update the form label to point to the text input.\n                originalLabel.attr('for', state.inputId);\n                \/\/ Add the event handlers.\n                addNavigation(options, state, originalSelect);\n\n                var suggestionsElement = $(document.getElementById(state.suggestionsId));\n                \/\/ Hide the suggestions by default.\n                suggestionsElement.hide();\n                Aria.hide(suggestionsElement.get());\n\n                return;\n            })\n            .then(function() {\n                \/\/ Show the current values in the selection list.\n                return updateSelectionList(options, state, originalSelect);\n            })\n            .then(function() {\n                return M.util.js_complete(pendingKey);\n            })\n            .catch(function(error) {\n                M.util.js_complete(pendingKey);\n                notification.exception(error);\n            });\n        }\n    };\n});\n"],"file":"form-autocomplete.min.js"}