Proyectos de Subversion Moodle

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

//

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

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

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

// (at your option) any later version.

//

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

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

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

// GNU General Public License for more details.

//

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

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

/**

 * Question bank filter management.

 *

 * @module     core_question/filter

 * @copyright  2021 Tomo Tsuyuki <tomotsuyuki@catalyst-au.net>

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

 */

import CoreFilter from 'core/datafilter';

import Notification from 'core/notification';

import Selectors from 'core/datafilter/selectors';

import Templates from 'core/templates';

import Fragment from 'core/fragment';

/**

 * Initialise the question bank filter on the element with the given id.

 *

 * @param {String} filterRegionId ID of the HTML element containing the filters.

 * @param {String} defaultcourseid Course ID for the default course to pass back to the view.

 * @param {String} defaultcategoryid Question bank category ID for the default course to pass back to the view.

 * @param {Number} perpage The number of questions to display per page.

 * @param {Number} contextId Context ID of the question bank view.

 * @param {string} component Frankenstyle name of the component for the fragment API callback (e.g. core_question)

 * @param {string} callback Name of the callback for the fragment API (e.g question_data)

 * @param {string} view The class name of the question bank view class used for this page.

 * @param {Number} cmid If we are in an activitiy, the course module ID.

 * @param {string} pagevars JSON-encoded parameters from passed from the view, including filters and jointype.

 * @param {string} extraparams JSON-encoded additional parameters specific to this view class, used for re-rendering the view.

 */

export const init = (

    filterRegionId,

    defaultcourseid,

    defaultcategoryid,

    perpage,

    contextId,

    component,

    callback,

    view,

    cmid,

    pagevars,

    extraparams

) => {

    const SELECTORS = {

        QUESTION_CONTAINER_ID: '#questionscontainer',

        QUESTION_TABLE: '#questionscontainer table',

        SORT_LINK: '#questionscontainer div.sorters a',

        PAGINATION_LINK: '#questionscontainer a[href].page-link',

        LASTCHANGED_FIELD: '#questionsubmit input[name=lastchanged]',

        BULK_ACTIONS: '#bulkactionsui-container input',

        MENU_ACTIONS: '.menu-action',

        EDIT_SWITCH: '.editmode-switch-form input[name=setmode]',

        EDIT_SWITCH_URL: '.editmode-switch-form input[name=pageurl]',

    };

    const filterSet = document.querySelector(`#${filterRegionId}`);

    const viewData = {

        extraparams,

        cmid,

        view,

        cat: defaultcategoryid,

        courseid: defaultcourseid,

        filter: {},

        jointype: 0,

        qpage: 0,

        qperpage: perpage,

        sortdata: {},

        lastchanged: document.querySelector(SELECTORS.LASTCHANGED_FIELD)?.value ?? null,

    };

    let sortData = {};

    const defaultSort = document.querySelector(SELECTORS.QUESTION_TABLE)?.dataset?.defaultsort;

    if (defaultSort) {

        sortData = JSON.parse(defaultSort);

    }

    /**

     * Retrieve table data.

     *

     * @param {Object} filterdata data

     * @param {Promise} pendingPromise pending promise

     */

    const applyFilter = (filterdata, pendingPromise) => {

        // Reload the questions based on the specified filters. If no filters are provided,

        // use the default category filter condition.

        if (filterdata) {

            // Main join types.

            viewData.jointype = parseInt(filterSet.dataset.filterverb, 10);

            delete filterdata.jointype;

            // Retrieve filter info.

            viewData.filter = filterdata;

            if (Object.keys(filterdata).length !== 0) {

                if (!isNaN(viewData.jointype)) {

                    filterdata.jointype = viewData.jointype;

                }

                updateUrlParams(filterdata);

            }

        }

        // Load questions for first page.

        viewData.filter = JSON.stringify(filterdata);

        viewData.sortdata = JSON.stringify(sortData);

        Fragment.loadFragment(component, callback, contextId, viewData)

            // Render questions for first page and pagination.

            .then((questionhtml, jsfooter) => {

                const questionscontainer = document.querySelector(SELECTORS.QUESTION_CONTAINER_ID);

                if (questionhtml === undefined) {

                    questionhtml = '';

                }

                if (jsfooter === undefined) {

                    jsfooter = '';

                }

                Templates.replaceNode(questionscontainer, questionhtml, jsfooter);

                // Resolve filter promise.

                if (pendingPromise) {

                    pendingPromise.resolve();

                }

                return {questionhtml, jsfooter};

            })

            .catch(Notification.exception);

    };

    // Init core filter processor with apply callback.

    const coreFilter = new CoreFilter(filterSet, applyFilter);

    coreFilter.activeFilters = {}; // Unset useless courseid filter.

    coreFilter.init();

    /**

     * Update URL Param based upon the current filter.

     *

     * @param {Object} filters Active filters.

     */

    const updateUrlParams = (filters) => {

        const url = new URL(location.href);

        const filterQuery = JSON.stringify(filters);

        url.searchParams.set('filter', filterQuery);

        history.pushState(filters, '', url);

        const editSwitch = document.querySelector(SELECTORS.EDIT_SWITCH);

        if (editSwitch) {

            const editSwitchUrlInput = document.querySelector(SELECTORS.EDIT_SWITCH_URL);

            const editSwitchUrl = new URL(editSwitchUrlInput.value);

            editSwitchUrl.searchParams.set('filter', filterQuery);

            editSwitchUrlInput.value = editSwitchUrl;

            editSwitch.dataset.pageurl = editSwitchUrl;

        }

    };

    /**

     * Cleans URL parameters.

     */

    const cleanUrlParams = () => {

        const queryString = location.search;

        const urlParams = new URLSearchParams(queryString);

        if (urlParams.has('cmid')) {

            const cleanedUrl = new URL(location.href.replace(location.search, ''));

            cleanedUrl.searchParams.set('cmid', urlParams.get('cmid'));

            history.pushState({}, '', cleanedUrl);

        }

        if (urlParams.has('courseid')) {

            const cleanedUrl = new URL(location.href.replace(location.search, ''));

            cleanedUrl.searchParams.set('courseid', urlParams.get('courseid'));

            history.pushState({}, '', cleanedUrl);

        }

    };

    // Add listeners for the sorting, paging and clear actions.

    document.addEventListener('click', e => {

        const sortableLink = e.target.closest(SELECTORS.SORT_LINK);

        const paginationLink = e.target.closest(SELECTORS.PAGINATION_LINK);

        const clearLink = e.target.closest(Selectors.filterset.actions.resetFilters);

        if (sortableLink) {

            e.preventDefault();

            const oldSort = sortData;

            sortData = {};

            sortData[sortableLink.dataset.sortname] = sortableLink.dataset.sortorder;

            for (const sortname in oldSort) {

                if (sortname !== sortableLink.dataset.sortname) {

                    sortData[sortname] = oldSort[sortname];

                }

            }

            viewData.qpage = 0;

            coreFilter.updateTableFromFilter();

        }

        if (paginationLink) {

            e.preventDefault();

            const paginationURL = new URL(paginationLink.getAttribute("href"));

            const qpage = paginationURL.searchParams.get('qpage');

            if (paginationURL.search !== null) {

                viewData.qpage = qpage;

                coreFilter.updateTableFromFilter();

            }

        }

        if (clearLink) {

            cleanUrlParams();

        }

    });

    // Run apply filter at page load.

    pagevars = JSON.parse(pagevars);

    let initialFilters;

    let jointype = null;

    if (pagevars.filter) {

        // Load initial filter based on page vars.

        initialFilters = pagevars.filter;

        if (pagevars.jointype) {

            jointype = pagevars.jointype;

        }

    }

    if (Object.entries(initialFilters).length !== 0) {

        // Remove the default empty filter row.

        const emptyFilterRow = filterSet.querySelector(Selectors.filterset.regions.emptyFilterRow);

        if (emptyFilterRow) {

            emptyFilterRow.remove();

        }

        // Add filters.

        let rowcount = 0;

        for (const urlFilter in initialFilters) {

            if (urlFilter === 'jointype') {

                jointype = initialFilters[urlFilter];

                continue;

            }

            // Add each filter row.

            rowcount += 1;

            const filterdata = {

                filtertype: urlFilter,

                values:  initialFilters[urlFilter].values,

                jointype: initialFilters[urlFilter].jointype,

                filteroptions: initialFilters[urlFilter].filteroptions,

                rownum: rowcount

            };

            coreFilter.addFilterRow(filterdata);

        }

        coreFilter.filterSet.dataset.filterverb = jointype;

        // Since we must filter by category, it does not make sense to allow the top-level "match any" or "match none" conditions,

        // as this would exclude the category. Remove those options and disable the select.

        const join = coreFilter.filterSet.querySelector(Selectors.filterset.fields.join);

        join.querySelectorAll(`option:not([value="${jointype}"])`).forEach((option) => option.remove());

        join.disabled = true;

    }

};