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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
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/**
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* Compare a given form's values and its previously set data attributes.
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*
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* @module core_grades/grades/grader/gradingpanel/comparison
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* @copyright 2019 Mathew May <mathew.solutions>
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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export const fillInitialValues = (form) => {
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Array.prototype.forEach.call(form.elements, (input) => {
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if (input.type === 'submit' || input.type === 'button') {
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return;
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} else if (input.type === 'radio' || input.type === 'checkbox') {
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input.dataset.initialValue = JSON.stringify(input.checked);
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} else if (typeof input.value !== 'undefined') {
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input.dataset.initialValue = JSON.stringify(input.value);
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} else if (input.type === 'select-one') {
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Array.prototype.forEach.call(input.options, (option) => {
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option.dataset.initialValue = JSON.stringify(option.selected);
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});
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}
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});
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};
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/**
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* Compare the form data with the initial form data from when the form was set up.
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*
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* If values have changed, return a truthy value.
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*
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* @param {HTMLElement} form
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* @return {Boolean}
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*/
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export const compareData = (form) => {
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const result = Array.prototype.some.call(form.elements, (input) => {
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if (input.type === 'submit' || input.type === 'button') {
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return false;
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} else if (input.type === 'radio' || input.type === 'checkbox') {
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if (typeof input.dataset.initialValue !== 'undefined') {
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return input.dataset.initialValue !== JSON.stringify(input.checked);
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}
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} else if (typeof input.value !== 'undefined') {
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if (typeof input.dataset.initialValue !== 'undefined') {
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return input.dataset.initialValue !== JSON.stringify(input.value);
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}
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} else if (input.type === 'select-one') {
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return Array.prototype.some.call(input.options, (option) => {
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if (typeof option.dataset.initialValue !== 'undefined') {
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return option.dataset.initialValue !== JSON.stringify(option.selected);
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}
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return false;
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});
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}
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// No value found to check. Assume that there were changes.
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return true;
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});
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// Fill the initial values again as the form may not be reloaded.
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fillInitialValues(form);
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return result;
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};
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