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// 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/>.
/**
* Notification manager for in-page notifications in Moodle.
*
* @module core/notification
* @copyright 2015 Damyon Wiese <damyon@moodle.com>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
* @since 2.9
*/
import Pending from 'core/pending';
import Log from 'core/log';
let currentContextId = M.cfg.contextid;
const notificationTypes = {
success: 'core/notification_success',
info: 'core/notification_info',
warning: 'core/notification_warning',
error: 'core/notification_error',
};
const notificationRegionId = 'user-notifications';
const Selectors = {
notificationRegion: `#${notificationRegionId}`,
fallbackRegionParents: [
'#region-main',
'[role="main"]',
'body',
],
};
const setupTargetRegion = () => {
let targetRegion = getNotificationRegion();
if (targetRegion) {
return false;
}
const newRegion = document.createElement('span');
newRegion.id = notificationRegionId;
return Selectors.fallbackRegionParents.some(selector => {
const targetRegion = document.querySelector(selector);
if (targetRegion) {
targetRegion.prepend(newRegion);
return true;
}
return false;
});
};
/**
* A notification object displayed to a user.
*
* @typedef {Object} Notification
* @property {string} message The body of the notification
* @property {string} type The type of notification to add (error, warning, info, success).
* @property {Boolean} closebutton Whether to show the close button.
* @property {Boolean} announce Whether to announce to screen readers.
*/
/**
* Poll the server for any new notifications.
*
* @method
* @returns {Promise}
*/
export const fetchNotifications = async() => {
const Ajax = await import('core/ajax');
return Ajax.call([{
methodname: 'core_fetch_notifications',
args: {
contextid: currentContextId
}
}])[0]
.then(addNotifications);
};
/**
* Add all of the supplied notifications.
*
* @method
* @param {Notification[]} notifications The list of notificaitons
* @returns {Promise}
*/
const addNotifications = notifications => {
if (!notifications.length) {
return Promise.resolve();
}
const pendingPromise = new Pending('core/notification:addNotifications');
notifications.forEach(notification => renderNotification(notification.template, notification.variables));
return pendingPromise.resolve();
};
/**
* Add a notification to the page.
*
* Note: This does not cause the notification to be added to the session.
*
* @method
* @param {Notification} notification The notification to add.
* @returns {Promise}
*/
export const addNotification = notification => {
const pendingPromise = new Pending('core/notification:addNotifications');
let template = notificationTypes.error;
notification = {
closebutton: true,
announce: true,
type: 'error',
...notification,
};
if (notification.template) {
template = notification.template;
delete notification.template;
} else if (notification.type) {
if (typeof notificationTypes[notification.type] !== 'undefined') {
template = notificationTypes[notification.type];
}
delete notification.type;
}
return renderNotification(template, notification)
.then(pendingPromise.resolve);
};
const renderNotification = async(template, variables) => {
if (typeof variables.message === 'undefined' || !variables.message) {
Log.debug('Notification received without content. Skipping.');
return;
}
const pendingPromise = new Pending('core/notification:renderNotification');
const Templates = await import('core/templates');
Templates.renderForPromise(template, variables)
.then(({html, js = ''}) => {
Templates.prependNodeContents(getNotificationRegion(), html, js);
return;
})
.then(pendingPromise.resolve)
.catch(exception);
};
const getNotificationRegion = () => document.querySelector(Selectors.notificationRegion);
/**
* Alert dialogue.
*
* @method
* @param {String|Promise} title
* @param {String|Promise} message
* @param {String|Promise} cancelText
* @returns {Promise}
*/
export const alert = async(title, message, cancelText) => {
var pendingPromise = new Pending('core/notification:alert');
const ModalFactory = await import('core/modal_factory');
return ModalFactory.create({
type: ModalFactory.types.ALERT,
body: message,
title: title,
buttons: {
cancel: cancelText,
},
removeOnClose: true,
})
.then(function(modal) {
modal.show();
pendingPromise.resolve();
return modal;
});
};
/**
* The confirm has now been replaced with a save and cancel dialogue.
*
* @method
* @param {String|Promise} title
* @param {String|Promise} question
* @param {String|Promise} saveLabel
* @param {String|Promise} noLabel
* @param {String|Promise} saveCallback
* @param {String|Promise} cancelCallback
* @returns {Promise}
*/
export const confirm = (title, question, saveLabel, noLabel, saveCallback, cancelCallback) =>
saveCancel(title, question, saveLabel, saveCallback, cancelCallback);
/**
* The Save and Cancel dialogue helper.
*
* @method
* @param {String|Promise} title
* @param {String|Promise} question
* @param {String|Promise} saveLabel
* @param {String|Promise} saveCallback
* @param {String|Promise} cancelCallback
* @param {Object} options
* @param {HTMLElement} [options.triggerElement=null] The element that triggered the modal (will receive the focus after hidden)
* @returns {Promise}
*/
export const saveCancel = async(title, question, saveLabel, saveCallback, cancelCallback, {
triggerElement = null,
} = {}) => {
const pendingPromise = new Pending('core/notification:confirm');
const [
ModalFactory,
ModalEvents,
] = await Promise.all([
import('core/modal_factory'),
import('core/modal_events'),
]);
return ModalFactory.create({
type: ModalFactory.types.SAVE_CANCEL,
title: title,
body: question,
buttons: {
// Note: The noLabel is no longer supported.
save: saveLabel,
},
removeOnClose: true,
})
.then(function(modal) {
modal.show();
modal.getRoot().on(ModalEvents.save, saveCallback);
modal.getRoot().on(ModalEvents.cancel, cancelCallback);
modal.getRoot().on(ModalEvents.hidden, () => triggerElement?.focus());
pendingPromise.resolve();
return modal;
});
};
/**
* Add all of the supplied notifications.
*
* @param {Promise|String} title The header of the modal
* @param {Promise|String} question What do we want the user to confirm
* @param {Promise|String} saveLabel The modal action link text
* @param {Object} options
* @param {HTMLElement} [options.triggerElement=null] The element that triggered the modal (will receive the focus after hidden)
* @return {Promise}
*/
export const saveCancelPromise = (title, question, saveLabel, {
triggerElement = null,
} = {}) => new Promise((resolve, reject) => {
saveCancel(title, question, saveLabel, resolve, reject, {triggerElement});
});
/**
* Wrap M.core.exception.
*
* @method
* @param {Error} ex
*/
export const exception = async ex => {
const pendingPromise = new Pending('core/notification:displayException');
// Fudge some parameters.
if (!ex.stack) {
ex.stack = '';
}
if (ex.debuginfo) {
ex.stack += ex.debuginfo + '\n';
}
if (!ex.backtrace && ex.stacktrace) {
ex.backtrace = ex.stacktrace;
}
if (ex.backtrace) {
ex.stack += ex.backtrace;
const ln = ex.backtrace.match(/line ([^ ]*) of/);
const fn = ex.backtrace.match(/ of ([^:]*): /);
if (ln && ln[1]) {
ex.lineNumber = ln[1];
}
if (fn && fn[1]) {
ex.fileName = fn[1];
if (ex.fileName.length > 30) {
ex.fileName = '...' + ex.fileName.substr(ex.fileName.length - 27);
}
}
}
if (typeof ex.name === 'undefined' && ex.errorcode) {
ex.name = ex.errorcode;
}
const Y = await import('core/yui');
Y.use('moodle-core-notification-exception', function() {
var modal = new M.core.exception(ex);
modal.show();
pendingPromise.resolve();
});
};
/**
* Initialise the page for the suppled context, and displaying the supplied notifications.
*
* @method
* @param {Number} contextId
* @param {Notification[]} notificationList
*/
export const init = (contextId, notificationList) => {
currentContextId = contextId;
// Setup the message target region if it isn't setup already
setupTargetRegion();
// Add provided notifications.
addNotifications(notificationList);
};
// To maintain backwards compatability we export default here.
export default {
init,
fetchNotifications,
addNotification,
alert,
confirm,
saveCancel,
saveCancelPromise,
exception,
};
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