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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 .\n\n\/**\n * Autocomplete wrapper for select2 library.\n *\n * @module core\/form-autocomplete\n * @copyright 2015 Damyon Wiese \n * @license http:\/\/www.gnu.org\/copyleft\/gpl.html GNU GPL v3 or later\n * @since 3.0\n *\/\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 \/\/ Ensure we are creating a properly formed selector based on the active value.\n var activeValue = selectionRegion.attr('data-active-value')?.replace(\/\"\/g, '\\\\\"');\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 * @returns {Boolean}\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 = $('');\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 = $('');\n originalSelect.append(option);\n }\n if ($.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 = $('');\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 {\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 \/\/ Ensure we enhance the element only once.\n if (originalSelect.data('enhanced') === 'enhanced') {\n M.util.js_complete(pendingKey);\n return false;\n }\n originalSelect.data('enhanced', 'enhanced');\n\n \/\/ Hide the original select.\n Aria.hide(originalSelect.get());\n originalSelect.css('visibility', 'hidden');\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('');\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"}