Your IP : 192.168.165.1
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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 * Javascript to enhance the paged content paging bar.\n *\n * @module core/paging_bar\n * @copyright 2018 Ryan Wyllie <ryan@moodle.com>\n * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later\n */\ndefine([\n 'jquery',\n 'core/custom_interaction_events',\n 'core/paged_content_events',\n 'core/str',\n 'core/pubsub'\n],\nfunction(\n $,\n CustomEvents,\n PagedContentEvents,\n Str,\n PubSub\n) {\n\n var SELECTORS = {\n ROOT: '[data-region=\"paging-bar\"]',\n PAGE: '[data-page]',\n PAGE_ITEM: '[data-region=\"page-item\"]',\n PAGE_LINK: '[data-region=\"page-link\"]',\n FIRST_BUTTON: '[data-control=\"first\"]',\n LAST_BUTTON: '[data-control=\"last\"]',\n NEXT_BUTTON: '[data-control=\"next\"]',\n PREVIOUS_BUTTON: '[data-control=\"previous\"]',\n DOTS_BUTTONS: '[data-dots]',\n BEGINNING_DOTS_BUTTON: '[data-dots=\"beginning\"]',\n ENDING_DOTS_BUTTON: '[data-dots=\"ending\"]',\n };\n\n /**\n * Get the page element by number.\n *\n * @param {object} root The root element.\n * @param {Number} pageNumber The page number.\n * @return {jQuery}\n */\n var getPageByNumber = function(root, pageNumber) {\n return root.find(SELECTORS.PAGE_ITEM + '[data-page-number=\"' + pageNumber + '\"]');\n };\n\n /**\n * Get the next button element.\n *\n * @param {object} root The root element.\n * @return {jQuery}\n */\n var getNextButton = function(root) {\n return root.find(SELECTORS.NEXT_BUTTON);\n };\n\n /**\n * Set the last page number after which no more pages\n * should be loaded.\n *\n * @param {object} root The root element.\n * @param {Number} number Page number.\n */\n var setLastPageNumber = function(root, number) {\n root.attr('data-last-page-number', number);\n };\n\n /**\n * Get the last page number.\n *\n * @param {object} root The root element.\n * @return {Number}\n */\n var getLastPageNumber = function(root) {\n return parseInt(root.attr('data-last-page-number'), 10);\n };\n\n /**\n * Get the active page number.\n *\n * @param {object} root The root element.\n * @returns {Number} The page number\n */\n var getActivePageNumber = function(root) {\n return parseInt(root.attr('data-active-page-number'), 10);\n };\n\n /**\n * Set the active page number.\n *\n * @param {object} root The root element.\n * @param {Number} number Page number.\n */\n var setActivePageNumber = function(root, number) {\n root.attr('data-active-page-number', number);\n };\n\n /**\n * Check if there is an active page number.\n *\n * @param {object} root The root element.\n * @returns {bool}\n */\n var hasActivePageNumber = function(root) {\n var number = getActivePageNumber(root);\n return !isNaN(number) && number != 0;\n };\n\n /**\n * Get the page number for a given page.\n *\n * @param {object} root The root element.\n * @param {object} page The page element.\n * @returns {Number} The page number\n */\n var getPageNumber = function(root, page) {\n if (page.attr('data-page') != undefined) {\n // If it's an actual page then we can just use the page number\n // attribute.\n return parseInt(page.attr('data-page-number'), 10);\n }\n\n var pageNumber = 1;\n var activePageNumber = null;\n\n switch (page.attr('data-control')) {\n case 'first':\n pageNumber = 1;\n break;\n\n case 'last':\n pageNumber = getLastPageNumber(root);\n break;\n\n case 'next':\n activePageNumber = getActivePageNumber(root);\n var lastPage = getLastPageNumber(root);\n if (!lastPage) {\n pageNumber = activePageNumber + 1;\n } else if (activePageNumber && activePageNumber < lastPage) {\n pageNumber = activePageNumber + 1;\n } else {\n pageNumber = lastPage;\n }\n break;\n\n case 'previous':\n activePageNumber = getActivePageNumber(root);\n if (activePageNumber && activePageNumber > 1) {\n pageNumber = activePageNumber - 1;\n } else {\n pageNumber = 1;\n }\n break;\n\n default:\n pageNumber = 1;\n break;\n }\n\n // Make sure we return an int not a string.\n return parseInt(pageNumber, 10);\n };\n\n /**\n * Get the limit of items for each page.\n *\n * @param {object} root The root element.\n * @returns {Number}\n */\n var getLimit = function(root) {\n return parseInt(root.attr('data-items-per-page'), 10);\n };\n\n /**\n * Set the limit of items for each page.\n *\n * @param {object} root The root element.\n * @param {Number} limit Items per page limit.\n */\n var setLimit = function(root, limit) {\n root.attr('data-items-per-page', limit);\n };\n\n /**\n * Show the paging bar.\n *\n * @param {object} root The root element.\n */\n var show = function(root) {\n root.removeClass('hidden');\n };\n\n /**\n * Hide the paging bar.\n *\n * @param {object} root The root element.\n */\n var hide = function(root) {\n root.addClass('hidden');\n };\n\n /**\n * Disable the next and last buttons in the paging bar.\n *\n * @param {object} root The root element.\n */\n var disableNextControlButtons = function(root) {\n var nextButton = root.find(SELECTORS.NEXT_BUTTON);\n var lastButton = root.find(SELECTORS.LAST_BUTTON);\n\n nextButton.addClass('disabled');\n nextButton.attr('aria-disabled', true);\n lastButton.addClass('disabled');\n lastButton.attr('aria-disabled', true);\n };\n\n /**\n * Enable the next and last buttons in the paging bar.\n *\n * @param {object} root The root element.\n */\n var enableNextControlButtons = function(root) {\n var nextButton = root.find(SELECTORS.NEXT_BUTTON);\n var lastButton = root.find(SELECTORS.LAST_BUTTON);\n\n nextButton.removeClass('disabled');\n nextButton.removeAttr('aria-disabled');\n lastButton.removeClass('disabled');\n lastButton.removeAttr('aria-disabled');\n };\n\n /**\n * Disable the previous and first buttons in the paging bar.\n *\n * @param {object} root The root element.\n */\n var disablePreviousControlButtons = function(root) {\n var previousButton = root.find(SELECTORS.PREVIOUS_BUTTON);\n var firstButton = root.find(SELECTORS.FIRST_BUTTON);\n\n previousButton.addClass('disabled');\n previousButton.attr('aria-disabled', true);\n firstButton.addClass('disabled');\n firstButton.attr('aria-disabled', true);\n };\n\n /**\n * Adjusts the size of the paging bar and hides unnecessary pages.\n *\n * @param {object} root The root element.\n */\n var adjustPagingBarSize = function(root) {\n var activePageNumber = getActivePageNumber(root);\n var lastPageNumber = getLastPageNumber(root);\n\n var dotsButtons = root.find(SELECTORS.DOTS_BUTTONS);\n var beginningDotsButton = root.find(SELECTORS.BEGINNING_DOTS_BUTTON);\n var endingDotsButton = root.find(SELECTORS.ENDING_DOTS_BUTTON);\n\n var pages = root.find(SELECTORS.PAGE);\n var barSize = parseInt(root.attr('data-bar-size'), 10);\n\n if (barSize && lastPageNumber > barSize) {\n\n var minpage = Math.max(activePageNumber - Math.round(barSize / 2), 1);\n var maxpage = minpage + barSize - 1;\n\n if (maxpage >= lastPageNumber) {\n maxpage = lastPageNumber;\n minpage = maxpage - barSize + 1;\n }\n\n if (minpage > 1) {\n show(beginningDotsButton);\n minpage++;\n } else {\n hide(beginningDotsButton);\n }\n if (maxpage < lastPageNumber) {\n show(endingDotsButton);\n maxpage--;\n } else {\n hide(endingDotsButton);\n }\n dotsButtons.addClass('disabled');\n dotsButtons.attr('aria-disabled', true);\n\n hide(pages);\n\n pages.each(function(index, page) {\n page = $(page);\n if ((index + 1) >= minpage && (index + 1) <= maxpage) {\n show(page);\n }\n });\n\n } else {\n hide(dotsButtons);\n }\n };\n\n /**\n * Enable the previous and first buttons in the paging bar.\n *\n * @param {object} root The root element.\n */\n var enablePreviousControlButtons = function(root) {\n var previousButton = root.find(SELECTORS.PREVIOUS_BUTTON);\n var firstButton = root.find(SELECTORS.FIRST_BUTTON);\n\n previousButton.removeClass('disabled');\n previousButton.removeAttr('aria-disabled');\n firstButton.removeClass('disabled');\n firstButton.removeAttr('aria-disabled');\n };\n\n /**\n * Get the components for a get_string request for the aria-label\n * on a page. The value is a comma separated string of key and\n * component.\n *\n * @param {object} root The root element.\n * @return {array} First element is the key, second is the component.\n */\n var getPageAriaLabelComponents = function(root) {\n var componentString = root.attr('data-aria-label-components-pagination-item');\n var components = componentString.split(',').map(function(component) {\n return component.trim();\n });\n return components;\n };\n\n /**\n * Get the components for a get_string request for the aria-label\n * on an active page. The value is a comma separated string of key and\n * component.\n *\n * @param {object} root The root element.\n * @return {array} First element is the key, second is the component.\n */\n var getActivePageAriaLabelComponents = function(root) {\n var componentString = root.attr('data-aria-label-components-pagination-active-item');\n var components = componentString.split(',').map(function(component) {\n return component.trim();\n });\n return components;\n };\n\n /**\n * Set page numbers on each of the given items. Page numbers are set\n * from 1..n (where n is the number of items).\n *\n * Sets the active page number to be the last page found with\n * an \"active\" class (if any).\n *\n * Sets the last page number.\n *\n * @param {object} root The root element.\n * @param {jQuery} items A jQuery list of items.\n */\n var generatePageNumbers = function(root, items) {\n var lastPageNumber = 0;\n setActivePageNumber(root, 0);\n\n items.each(function(index, item) {\n var pageNumber = index + 1;\n item = $(item);\n item.attr('data-page-number', pageNumber);\n lastPageNumber++;\n\n if (item.hasClass('active')) {\n setActivePageNumber(root, pageNumber);\n }\n });\n\n setLastPageNumber(root, lastPageNumber);\n };\n\n /**\n * Set the aria-labels on each of the page items in the paging bar.\n * This includes the next, previous, first, and last items.\n *\n * @param {object} root The root element.\n */\n var generateAriaLabels = function(root) {\n var pageAriaLabelComponents = getPageAriaLabelComponents(root);\n var activePageAriaLabelComponents = getActivePageAriaLabelComponents(root);\n var activePageNumber = getActivePageNumber(root);\n var pageItems = root.find(SELECTORS.PAGE_ITEM);\n // We want to request all of the strings at once rather than\n // one at a time.\n var stringRequests = pageItems.map(function(index, page) {\n page = $(page);\n var pageNumber = getPageNumber(root, page);\n\n if (pageNumber === activePageNumber) {\n return {\n key: activePageAriaLabelComponents[0],\n component: activePageAriaLabelComponents[1],\n param: pageNumber\n };\n } else {\n return {\n key: pageAriaLabelComponents[0],\n component: pageAriaLabelComponents[1],\n param: pageNumber\n };\n }\n });\n\n Str.get_strings(stringRequests).then(function(strings) {\n pageItems.each(function(index, page) {\n page = $(page);\n var string = strings[index];\n page.attr('aria-label', string);\n page.find(SELECTORS.PAGE_LINK).attr('aria-label', string);\n });\n\n return strings;\n })\n .catch(function() {\n // No need to interrupt the page if we can't load the aria lang strings.\n return;\n });\n };\n\n /**\n * Make the paging bar item for the given page number visible and fire\n * the SHOW_PAGES paged content event to tell any listening content to\n * update.\n *\n * @param {object} root The root element.\n * @param {Number} pageNumber The number for the page to show.\n * @param {string} id A uniqie id for this instance.\n */\n var showPage = function(root, pageNumber, id) {\n var lastPageNumber = getLastPageNumber(root);\n var isSamePage = pageNumber == getActivePageNumber(root);\n var limit = getLimit(root);\n var offset = (pageNumber - 1) * limit;\n\n if (!isSamePage) {\n // We only need to toggle the active class if the user didn't click\n // on the already active page.\n root.find(SELECTORS.PAGE_ITEM).removeClass('active').removeAttr('aria-current');\n var page = getPageByNumber(root, pageNumber);\n page.addClass('active');\n page.attr('aria-current', true);\n setActivePageNumber(root, pageNumber);\n\n adjustPagingBarSize(root);\n }\n\n // Make sure the control buttons are disabled as the user navigates\n // to either end of the limits.\n if (lastPageNumber && pageNumber >= lastPageNumber) {\n disableNextControlButtons(root);\n } else {\n enableNextControlButtons(root);\n }\n\n if (pageNumber > 1) {\n enablePreviousControlButtons(root);\n } else {\n disablePreviousControlButtons(root);\n }\n\n generateAriaLabels(root);\n\n // This event requires a payload that contains a list of all pages that\n // were activated. In the case of the paging bar we only show one page at\n // a time.\n PubSub.publish(id + PagedContentEvents.SHOW_PAGES, [{\n pageNumber: pageNumber,\n limit: limit,\n offset: offset\n }]);\n };\n\n /**\n * Add event listeners for interactions with the paging bar as well as listening\n * for custom paged content events.\n *\n * Each event will trigger different logic to update parts of the paging bar's\n * display.\n *\n * @param {object} root The root element.\n * @param {string} id A uniqie id for this instance.\n */\n var registerEventListeners = function(root, id) {\n var ignoreControlWhileLoading = root.attr('data-ignore-control-while-loading');\n var loading = false;\n\n if (ignoreControlWhileLoading == \"\") {\n // Default to ignoring control while loading if not specified.\n ignoreControlWhileLoading = true;\n }\n\n CustomEvents.define(root, [\n CustomEvents.events.activate\n ]);\n\n root.on(CustomEvents.events.activate, SELECTORS.PAGE_ITEM, function(e, data) {\n data.originalEvent.preventDefault();\n data.originalEvent.stopPropagation();\n\n if (ignoreControlWhileLoading && loading) {\n // Do nothing if configured to ignore control while loading.\n return;\n }\n\n var page = $(e.target).closest(SELECTORS.PAGE_ITEM);\n\n if (!page.hasClass('disabled')) {\n var pageNumber = getPageNumber(root, page);\n showPage(root, pageNumber, id);\n loading = true;\n }\n });\n\n // This event is fired when all of the items have been loaded. Typically used\n // in an \"infinite\" pages context when we don't know the exact number of pages\n // ahead of time.\n PubSub.subscribe(id + PagedContentEvents.ALL_ITEMS_LOADED, function(pageNumber) {\n loading = false;\n var currentLastPage = getLastPageNumber(root);\n\n if (!currentLastPage || pageNumber < currentLastPage) {\n // Somehow the value we've got saved is higher than the new\n // value we just received. Perhaps events came out of order.\n // In any case, save the lowest value.\n setLastPageNumber(root, pageNumber);\n }\n\n if (pageNumber === 1 && root.attr('data-hide-control-on-single-page')) {\n // If all items were loaded on the first page then we can hide\n // the paging bar because there are no other pages to load.\n hide(root);\n disableNextControlButtons(root);\n disablePreviousControlButtons(root);\n } else {\n show(root);\n disableNextControlButtons(root);\n }\n });\n\n // This event is fired after all of the requested pages have been rendered.\n PubSub.subscribe(id + PagedContentEvents.PAGES_SHOWN, function() {\n // All pages have been shown so turn off the loading flag.\n loading = false;\n });\n\n // This is triggered when the paging limit is modified.\n PubSub.subscribe(id + PagedContentEvents.SET_ITEMS_PER_PAGE_LIMIT, function(limit) {\n // Update the limit.\n setLimit(root, limit);\n setLastPageNumber(root, 0);\n setActivePageNumber(root, 0);\n show(root);\n // Reload the data from page 1 again.\n showPage(root, 1, id);\n });\n };\n\n /**\n * Initialise the paging bar.\n * @param {object} root The root element.\n * @param {string} id A uniqie id for this instance.\n */\n var init = function(root, id) {\n root = $(root);\n var pages = root.find(SELECTORS.PAGE);\n generatePageNumbers(root, pages);\n registerEventListeners(root, id);\n\n if (hasActivePageNumber(root)) {\n var activePageNumber = getActivePageNumber(root);\n // If the the paging bar was rendered with an active page selected\n // then make sure we fired off the event to tell the content page to\n // show.\n getPageByNumber(root, activePageNumber).click();\n if (activePageNumber == 1) {\n // If the first page is active then disable the previous buttons.\n disablePreviousControlButtons(root);\n }\n } else {\n // There was no active page number so load the first page using\n // the next button. This allows the infinite pagination to work.\n getNextButton(root).click();\n }\n\n adjustPagingBarSize(root);\n };\n\n return {\n init: init,\n disableNextControlButtons: disableNextControlButtons,\n enableNextControlButtons: enableNextControlButtons,\n disablePreviousControlButtons: disablePreviousControlButtons,\n enablePreviousControlButtons: enablePreviousControlButtons,\n showPage: showPage,\n rootSelector: SELECTORS.ROOT,\n };\n});\n"],"file":"paged_content_paging_bar.min.js"}