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$(function () {
$(document).ready(function () {
$('.chat-container').removeClass('no-js');
var socket = io.connect(
'http://' + document.domain + ':' + location.port + '/chat',
{
transports: ['websocket']
}
);
// Store current username received from app context
var current_username = $('#username').val();
// On browser connect, emit a socket event to be added to
// room and assigned random username
socket.on('connect', function () {
socket.emit('joined', {});
});
// Triggered on any status change by any user, such as some
// user joined, or changed username, or left, etc.
socket.on('status', function (data) {
addMessageToRoom(data, current_username, 'status');
console.log(data, current_username);
});
// Triggered when message is received from a user. Even when sent
// by self, it get triggered after the server sends back the emit.
socket.on('message', function (data) {
addMessageToRoom(data, current_username, 'chat');
console.log(data, current_username);
});
// Triggered when disconnected either by server stop or timeout
socket.on('disconnect', function (data) {
addMessageToRoom({ 'msg': 'The chat server is disconnected.' }, current_username, 'status');
})
socket.on('connect_error', function (error) {
console.log("error");
})
// Trigger new message on enter or click of send message button.
$('#new-message').on('keypress', function (e) {
var code = e.keyCode || e.which;
if (code == 13) {
emitMessage(socket);
}
});
// Keep buttons disabled unless changed or not empty
$('#username').on('keyup', function (event) {
if ($('#username').val() !== '' && $('#username').val() !== current_username) {
if (event.keyCode == 13 || event.which == 13) {
this.blur();
current_username = updateUsername(socket) || current_username;
}
}
});
// Show warning of losing data
$(window).on('beforeunload', function (e) {
e.preventDefault();
e.returnValue = '';
return '';
});
});
});
var addMessageToRoom = function (data, current_username, messageType) {
var scrollDiff = getScrollDiffBefore();
if (messageType === 'status') {
addStatusMessage(data.msg);
if (data.connected_users) {
addUserList(data.connected_users, current_username);
}
} else if (messageType === 'chat') {
addChatMessage(data.username, data.msg)
}
scrollBottomMaybe(scrollDiff);
}
var emitMessage = function (socket) {
var text = $('#new-message').val();
$('#new-message').val('');
$('#chat').scrollTop($('#chat')[0].scrollHeight);
socket.emit('text', { msg: text });
}
var updateUsername = function (socket) {
var username = $('#username').val();
if (!checkUsernameExists(username) && !checkUsernameTooLong(username)) {
$.ajax({
method: 'POST',
url: `http://${document.domain}:${location.port}/update-session-username`,
contentType: 'application/json',
dataType: 'json',
data: JSON.stringify({ 'username': username })
}).done(function (response) {
console.log(response);
if (response.success && response.username == username) {
socket.emit('update_username', { username: username });
}
});
return username;
}
return false;
}
/************************************/
/********* Util Functions ***********/
/************************************/
var createUserListHTML = function (connected_users, current_user) {
var userListHTML = '';
connected_users.sort();
connected_users.forEach(function (username) {
if (username !== current_user) {
userListHTML += `<li>${sanitizeHTML(username)}</li>`;
}
});
return userListHTML;
}
var checkUsernameExists = function (username) {
$('#username-error').text('');
var userMatches = $('#user-list li').filter(function () {
return $(this).text() === username;
});
if (userMatches.length) {
$('#username-error').text('User with that username exists!');
return true;
}
return false;
}
var checkUsernameTooLong = function (username) {
$('#username-error').text('');
if (username.length > 128) {
$('#username-error').text('Please choose a shorter username.');
return true;
}
return false;
}
var getScrollDiffBefore = function () {
return $('#chat').scrollTop() - ($('#chat')[0].scrollHeight - $('#chat')[0].offsetHeight);
}
var scrollBottomMaybe = function (scrollDiff) {
// Scrolls to bottom if the user is scrolled at bottom
// if the user has scrolled up, it won't scroll at bottom.
// Note: when a user themselves send a message, it will still
// scroll to the bottom even if they had scrolled up before.
if (scrollDiff > 0) {
$('#chat').scrollTop($('#chat')[0].scrollHeight);
}
}
var addStatusMessage = function (message) {
$('#chat').append(
`<p class="status">${sanitizeHTML(message)}</p>`
);
}
var addChatMessage = function (username, message) {
$('#chat').append(`<p><span class="username">${sanitizeHTML(username)}</span><span class="message">${sanitizeHTML(message)}</span></p>`);
}
var addUserList = function (connected_users, current_username) {
$('#user-list').html(
createUserListHTML(
connected_users,
current_username
)
);
}
var sanitizeHTML = function (str) {
var temp = document.createElement('span');
temp.textContent = str;
return temp.innerHTML;
};
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