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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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* Simple method to check for changes to a form between two points in time.
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*
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* @module mod_assign/grading_form_change_checker
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* @copyright 2016 Damyon Wiese <damyon@moodle.com>
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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* @since 3.1
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*/
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define(['jquery'], function($) {
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return {
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/**
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* Save the values in the form to a data attribute so they can be compared later for changes.
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*
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* @method saveFormState
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* @param {String} selector The selector for the form element.
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*/
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saveFormState: function(selector) {
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$(selector).trigger('save-form-state');
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var data = $(selector).serialize();
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$(selector).data('saved-form-state', data);
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},
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/**
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* Compare the current values in the form to the previously saved state.
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*
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* @method checkFormForChanges
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* @param {String} selector The selector for the form element.
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* @return {Boolean} True if there are changes to the form data.
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*/
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checkFormForChanges: function(selector) {
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$(selector).trigger('save-form-state');
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var data = $(selector).serialize(),
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previousdata = $(selector).data('saved-form-state');
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if (typeof previousdata === 'undefined') {
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return false;
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}
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return (previousdata != data);
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}
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};
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});
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