Sindbad~EG File Manager
// 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/>.
/**
* This module provides change detection to forms, allowing a browser to warn the user before navigating away if changes
* have been made.
*
* Two flags are stored for each form:
* * a 'dirty' flag; and
* * a 'submitted' flag.
*
* When the page is unloaded each watched form is checked. If the 'dirty' flag is set for any form, and the 'submitted'
* flag is not set for any form, then a warning is shown.
*
* The 'dirty' flag is set when any form element is modified within a watched form.
* The flag can also be set programatically. This may be required for custom form elements.
*
* It is not possible to customise the warning message in any modern browser.
*
* Please note that some browsers have controls on when these alerts may or may not be shown.
* See {@link https://developer.mozilla.org/en-US/docs/Web/API/WindowEventHandlers/onbeforeunload} for browser-specific
* notes and references.
*
* @module core_form/changechecker
* @copyright 2021 Andrew Lyons <andrew@nicols.co.uk>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
* @example <caption>Usage where the FormElement is already held</caption>
*
* import {watchForm} from 'core_form/changechecker';
*
* // Fetch the form element somehow.
* watchForm(formElement);
*
* @example <caption>Usage from the child of a form - i.e. an input, button, div, etc.</caption>
*
* import {watchForm} from 'core_form/changechecker';
*
* // Watch the form by using a child of it.
* watchForm(document.querySelector('input[data-foo="bar"]'););
*
* @example <caption>Usage from within a template</caption>
* <form id="mod_example-entry-{{uniqid}}" ...>
* <!--
*
* -->
* </form>
* {{#js}}
* require(['core_form/changechecker'], function(changeChecker) {
* watchFormById('mod_example-entry-{{uniqid}}');
* });
* {{/js}}
*/
import {eventTypes} from 'core_editor/events';
import {get_string as getString} from 'core/str';
/**
* @property {Bool} initialised Whether the change checker has been initialised
* @private
*/
let initialised = false;
/**
* @property {String} warningString The warning string to show on form change failure
* @private
*/
let warningString;
/**
* @property {Array} watchedForms The list of watched forms
* @private
*/
let watchedForms = [];
/**
* @property {Bool} formChangeCheckerDisabled Whether the form change checker has been actively disabled
* @private
*/
let formChangeCheckerDisabled = false;
/**
* Get the nearest form element from a child element.
*
* @param {HTMLElement} formChild
* @returns {HTMLFormElement|null}
* @private
*/
const getFormFromChild = formChild => formChild.closest('form');
/**
* Watch the specified form for changes.
*
* @method
* @param {HTMLElement} formNode
*/
export const watchForm = formNode => {
// Normalise the formNode.
formNode = getFormFromChild(formNode);
if (!formNode) {
// No form found.
return;
}
if (isWatchingForm(formNode)) {
// This form is already watched.
return;
}
watchedForms.push(formNode);
};
/**
* Stop watching the specified form for changes.
*
* If the form was not watched, then no change is made.
*
* A child of the form may be passed instead.
*
* @method
* @param {HTMLElement} formNode
* @example <caption>Stop watching a form for changes</caption>
* import {unWatchForm} from 'core_form/changechecker';
*
* // ...
* document.addEventListener('click', e => {
* if (e.target.closest('[data-action="changePage"]')) {
* unWatchForm(e.target);
* }
* });
*/
export const unWatchForm = formNode => {
watchedForms = watchedForms.filter(watchedForm => !!watchedForm.contains(formNode));
};
/**
* Reset the 'dirty' flag for all watched forms.
*
* If a form was previously marked as 'dirty', then this flag will be cleared and when the page is unloaded no warning
* will be shown.
*
* @method
*/
export const resetAllFormDirtyStates = () => {
watchedForms.forEach(watchedForm => {
watchedForm.dataset.formSubmitted = "false";
watchedForm.dataset.formDirty = "false";
});
};
/**
* Reset the 'dirty' flag of the specified form.
*
* @method
* @param {HTMLElement} formNode
*/
export const resetFormDirtyState = formNode => {
formNode = getFormFromChild(formNode);
if (!formNode) {
return;
}
formNode.dataset.formSubmitted = "false";
formNode.dataset.formDirty = "false";
};
/**
* Mark all forms as dirty.
*
* This function is only for backwards-compliance with the old YUI module and should not be used in any other situation.
* It will be removed in Moodle 4.4.
*
* @method
*/
export const markAllFormsAsDirty = () => {
watchedForms.forEach(watchedForm => {
watchedForm.dataset.formDirty = "true";
});
};
/**
* Mark a specific form as dirty.
*
* This behaviour may be required for custom form elements which are not caught by the standard change listeners.
*
* @method
* @param {HTMLElement} formNode
*/
export const markFormAsDirty = formNode => {
formNode = getFormFromChild(formNode);
if (!formNode) {
return;
}
// Mark it as dirty.
formNode.dataset.formDirty = "true";
};
/**
* Actively disable the form change checker.
*
* Please note that it cannot be re-enabled once disabled.
*
* @method
*/
export const disableAllChecks = () => {
formChangeCheckerDisabled = true;
};
/**
* Check whether any watched from is dirty.
*
* @method
* @returns {Bool}
*/
export const isAnyWatchedFormDirty = () => {
if (formChangeCheckerDisabled) {
// The form change checker is disabled.
return false;
}
const hasSubmittedForm = watchedForms.some(watchedForm => watchedForm.dataset.formSubmitted === "true");
if (hasSubmittedForm) {
// Do not warn about submitted forms, ever.
return false;
}
const hasDirtyForm = watchedForms.some(watchedForm => {
if (!watchedForm.isConnected) {
// The watched form is not connected to the DOM.
return false;
}
if (watchedForm.dataset.formDirty === "true") {
// The form has been marked as dirty.
return true;
}
// Elements currently holding focus will not have triggered change detection.
// Check whether the value matches the original value upon form load.
if (document.activeElement && document.activeElement.dataset.propertyIsEnumerable('initialValue')) {
const isActiveElementWatched = isWatchingForm(document.activeElement)
&& !shouldIgnoreChangesForNode(document.activeElement);
const hasValueChanged = document.activeElement.dataset.initialValue !== document.activeElement.value;
if (isActiveElementWatched && hasValueChanged) {
return true;
}
}
return false;
});
if (hasDirtyForm) {
// At least one form is dirty.
return true;
}
// Handle TinyMCE editor instances.
// TinyMCE forms may not have been initialised at the time that startWatching is called.
// Check whether any tinyMCE editor is dirty.
if (typeof window.tinyMCE !== 'undefined' && window.tinyMCE.editors) {
if (window.tinyMCE.editors.some(editor => editor.isDirty())) {
return true;
}
}
// No dirty forms detected.
return false;
};
/**
* Get the watched form for the specified target.
*
* @method
* @param {HTMLNode} target
* @returns {HTMLFormElement}
* @private
*/
const getFormForNode = target => watchedForms.find(watchedForm => watchedForm.contains(target));
/**
* Whether the specified target is a watched form.
*
* @method
* @param {HTMLNode} target
* @returns {Bool}
* @private
*/
const isWatchingForm = target => watchedForms.some(watchedForm => watchedForm.contains(target));
/**
* Whether the specified target should ignore changes or not.
*
* @method
* @param {HTMLNode} target
* @returns {Bool}
* @private
*/
const shouldIgnoreChangesForNode = target => !!target.closest('.ignoredirty');
/**
* Mark a form as changed.
*
* @method
* @param {HTMLElement} changedNode An element in the form which was changed
*/
export const markFormChangedFromNode = changedNode => {
if (changedNode.dataset.formChangeCheckerOverride) {
// Changes to this form node disable the form change checker entirely.
// This is intended for select fields which cause an immediate redirect.
disableAllChecks();
return;
}
if (!isWatchingForm(changedNode)) {
return;
}
if (shouldIgnoreChangesForNode(changedNode)) {
return;
}
// Mark the form as dirty.
const formNode = getFormForNode(changedNode);
formNode.dataset.formDirty = "true";
};
/**
* Mark a form as submitted.
*
* @method
* @param {HTMLElement} formNode An element in the form to mark as submitted
*/
export const markFormSubmitted = formNode => {
formNode = getFormFromChild(formNode);
if (!formNode) {
return;
}
formNode.dataset.formSubmitted = "true";
};
/**
* Mark all forms as submitted.
*
* This function is only for backwards-compliance with the old YUI module and should not be used in any other situation.
* It will be removed in Moodle 4.4.
*
* @method
*/
export const markAllFormsSubmitted = () => {
watchedForms.forEach(watchedForm => markFormSubmitted(watchedForm));
};
/**
* Handle the beforeunload event.
*
* @method
* @param {Event} e
* @returns {string|null}
* @private
*/
const beforeUnloadHandler = e => {
// Please note: The use of Promises in this function is forbidden.
// This is an event handler and _cannot_ be asynchronous.
let warnBeforeUnload = isAnyWatchedFormDirty() && !M.cfg.behatsiterunning;
if (warnBeforeUnload) {
// According to the specification, to show the confirmation dialog an event handler should call preventDefault()
// on the event.
e.preventDefault();
// However note that not all browsers support this method, and some instead require the event handler to
// implement one of two legacy methods:
// * assigning a string to the event's returnValue property; and
// * returning a string from the event handler.
// Assigning a string to the event's returnValue property.
e.returnValue = warningString;
// Returning a string from the event handler.
return e.returnValue;
}
// Attaching an event handler/listener to window or document's beforeunload event prevents browsers from using
// in-memory page navigation caches, like Firefox's Back-Forward cache or WebKit's Page Cache.
// Remove the handler.
window.removeEventListener('beforeunload', beforeUnloadHandler);
return null;
};
/**
* Start watching for form changes.
*
* This function is called on module load, and should not normally be called.
*
* @method
* @protected
*/
export const startWatching = () => {
if (initialised) {
return;
}
// Add legacy support to provide b/c for the old YUI version.
addLegacyFunctions();
document.addEventListener('change', e => {
if (!isWatchingForm(e.target)) {
return;
}
markFormChangedFromNode(e.target);
});
document.addEventListener('click', e => {
const ignoredButton = e.target.closest('[data-formchangechecker-ignore-submit]');
if (!ignoredButton) {
return;
}
const ownerForm = getFormFromChild(e.target);
if (ownerForm) {
ownerForm.dataset.ignoreSubmission = "true";
}
});
document.addEventListener('focusin', e => {
if (e.target.matches('input, textarea, select')) {
if (e.target.dataset.propertyIsEnumerable('initialValue')) {
// The initial value has already been set.
return;
}
e.target.dataset.initialValue = e.target.value;
}
});
document.addEventListener('submit', e => {
const formNode = getFormFromChild(e.target);
if (!formNode) {
// Weird, but watch for this anyway.
return;
}
if (formNode.dataset.ignoreSubmission) {
// This form was submitted by a button which requested that the form checked should not mark it as submitted.
formNode.dataset.ignoreSubmission = "false";
return;
}
markFormSubmitted(formNode);
});
document.addEventListener(eventTypes.editorContentRestored, e => {
if (e.target != document) {
resetFormDirtyState(e.target);
} else {
resetAllFormDirtyStates();
}
});
getString('changesmadereallygoaway', 'moodle')
.then(changesMadeString => {
warningString = changesMadeString;
return;
})
.catch();
window.addEventListener('beforeunload', beforeUnloadHandler);
};
/**
* Add legacy functions for backwards compatability.
*
* @method
* @private
*/
const addLegacyFunctions = () => {
// Create a curried function to log use of the old function and provide detail on its replacement.
const getLoggedLegacyFallback = (oldFunctionName, newFunctionName, newFunction) => (...args) => {
window.console.warn(
`The moodle-core-formchangechecker has been deprecated ` +
`and replaced with core_form/changechecker. ` +
`The ${oldFunctionName} function has been replaced with ${newFunctionName}.`
);
newFunction(...args);
};
/* eslint-disable */
window.M.core_formchangechecker = {
init: getLoggedLegacyFallback('init', 'watchFormById', watchFormById),
reset_form_dirty_state: getLoggedLegacyFallback('reset_form_dirty_state', 'resetFormDirtyState', resetAllFormDirtyStates),
set_form_changed: getLoggedLegacyFallback('set_form_changed', 'markFormAsDirty', markAllFormsAsDirty),
set_form_submitted: getLoggedLegacyFallback('set_form_submitted', 'markFormSubmitted', markAllFormsSubmitted),
};
/* eslint-enable */
};
/**
* Watch the form matching the specified ID for changes.
*
* @method
* @param {String} formId
*/
export const watchFormById = formId => {
watchForm(document.getElementById(formId));
};
/**
* Reset the dirty state of the form matching the specified ID..
*
* @method
* @param {String} formId
*/
export const resetFormDirtyStateById = formId => {
resetFormDirtyState(document.getElementById(formId));
};
/**
* Mark the form matching the specified ID as dirty.
*
* @method
* @param {String} formId
*/
export const markFormAsDirtyById = formId => {
markFormAsDirty(document.getElementById(formId));
};
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