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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/>.
/**
* Module to add/remove contact using ajax.
*
* @module core_message/toggle_contact_button
* @class toggle_contact_button
* @package message
* @copyright 2016 Ryan Wyllie <ryan@moodle.com>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
define(['jquery', 'core/ajax', 'core/templates', 'core/notification', 'core/custom_interaction_events'],
function($, Ajax, Templates, Notification, CustomEvents) {
/**
* Check the state of the element, if the current user is a contact or not.
*
* @method isContact
* @param {object} element jQuery object for the button
* @return {bool}
*/
var isContact = function(element) {
return element.attr('data-is-contact') == '1';
};
/**
* Record that the user is a contact.
*
* @method setContact
* @param {object} element jQuery object for the button
*/
var setContact = function(element) {
element.attr('data-is-contact', '1');
};
/**
* Record that the user is not a contact.
*
* @method setNotContact
* @param {object} element jQuery object for the button
*/
var setNotContact = function(element) {
element.attr('data-is-contact', '0');
};
/**
* Get the id for the user being viewed.
*
* @method getUserId
* @param {object} element jQuery object for the button
* @return {int}
*/
var getUserId = function(element) {
return element.attr('data-userid');
};
/**
* Check if this element is currently loading.
*
* @method isLoading
* @param {object} element jQuery object for the button
* @return {bool}
*/
var isLoading = function(element) {
return element.hasClass('loading') || element.attr('disabled');
};
/**
* Sends an ajax request to the server and handles the element state
* while the request is being performed.
*
* @method sendRequest
* @param {object} element jQuery object for the button
* @param {object} request Request hash to send
* @return {object} jQuery promise
*/
var sendRequest = function(element, request) {
if (isLoading(element)) {
return $.Deferred();
}
element.addClass('loading');
element.attr('disabled', 'disabled');
return Ajax.call([request])[0]
.fail(Notification.exception)
.always(function() {
element.removeClass('loading');
element.removeAttr('disabled');
});
};
/**
* Send a request to the server to add the current user as
* a contact. The contents of the button are changed to the
* remove contact button upon success.
*
* @method addContact
* @param {object} element jQuery object for the button
*/
var addContact = function(element) {
if (isLoading(element)) {
return;
}
var request = {
methodname: 'core_message_create_contacts',
args: {
userids: [getUserId(element)],
}
};
sendRequest(element, request).done(function() {
setContact(element);
Templates.render('message/remove_contact_button', {}).done(function(html, js) {
Templates.replaceNodeContents(element, html, js);
});
});
};
/**
* Send a request to the server to remove the current user as
* a contact. The contents of the button are changed to the
* add contact button upon success.
*
* @method removeContact
* @param {object} element jQuery object for the button
*/
var removeContact = function(element) {
if (isLoading(element)) {
return;
}
var request = {
methodname: 'core_message_delete_contacts',
args: {
userids: [getUserId(element)],
}
};
sendRequest(element, request).done(function() {
setNotContact(element);
Templates.render('message/add_contact_button', {}).done(function(html, js) {
Templates.replaceNodeContents(element, html, js);
});
});
};
/**
* Enhances the given element with a loading gif and event handles to make
* ajax requests to add or remove a contact where appropriate.
*
* @method enhance
* @param {object} element jQuery object for the button
*/
var enhance = function(element) {
element = $(element);
if (!element.children('.loading-icon').length) {
// Add the loading gif if it isn't already there.
Templates.render('core/loading', {}).done(function(html, js) {
element.append(html, js);
});
}
CustomEvents.define(element, [CustomEvents.events.activate]);
element.on(CustomEvents.events.activate, function(e, data) {
if (isContact(element)) {
removeContact(element);
} else {
addContact(element);
}
e.preventDefault();
data.originalEvent.preventDefault();
});
};
return /** @alias module:message/toggle_contact_button */ {
enhance: enhance
};
});