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