Javascript object for the chat demo

chatdemo.js

var engine = {
   delay: 5000
	,currentID: 0
	,init: function(){
		window.chat = {};
		window.chat.data = {};
		$('#send').on('click', engine.sendMessage);
		$('#setName').on('click', engine.setUser);
		$('#message').on('keypress', function(e){
			if(e.which == 13 && $('#message').val().length){
				engine.sendMessage();
			}
		});
		if(!userName.length){
			$('#nameContainer').show()
		}
		else{
			$('#displayName').append(userName);
			$('#messageContainer').show();
			engine.start();
		}
		return;
	}
	,start: function(){
		engine.messageSubscriber();
		window.setInterval(engine.messageSubscriber, engine.delay);
		return;
	}
	,setUser: function(){
		if($('#userName').val().length){
			$.ajax({
				url: '/api/chat/setuser',
				data: {
					userid: $('#userName').val()
				},
				dataType: 'json',
				success: function(data){
					if(data.svrStatus == '0'){
						userName = $('#userName').val();
						$('#displayName').append(userName);
						$('#nameContainer').hide();
						$('#messageContainer').show();
						engine.start();
					}
					else{
						alert(data.svrMessage);
					}
				}
			});
		}
		else{
			alert('For real?!? Nah, you\'re kidding.  Enter a name.');
		}
		return;
	}
	,messageSubscriber: function(){
		$.ajax({
			 url: '/api/chat/list'
			,method: 'POST'
			,data: {
				startID: engine.currentID
			}
			,dataType: 'json'
			,cache: false
			,success: function(data){
				window.chat.data = data;
				engine.currentID = data.lastid;
				engine.processPayload(data);
			}
			,error: function(){
				$('<div/>', {
					text: 'Error interacting with /api/chat/list endpoint!'
				})
				.addClass('message-error')
				.appendTo('#chatDiv');
			}
		});
		return;
	}
	,processPayload: function(payload){
		var  messages = payload.messages
			,clients = payload.clients;

		// message handler
		for(var i = 0; i < messages.length; i++){

			var message = messages[i];
			if(!$('#message-' + message.msgid).length){ //prevent occasional hiccups
				switch(message.type){
					case 'message':
						var out = '<span id="message-' + message.msgid + '" class="message user-message"><span class="timestamp">';
						out += message.timestamp.split(' ')[1] + ' ' + message.timestamp.split(' ')[2] + '</span>';
						out += message.userid + ': ' + message.message + '</span>';
				        $('#chatDiv').append(out);
					break;
					case 'notice':
						var out = '<span id="message-' + message.msgid + '" class="message notice-message"><span class="timestamp">';
						out += message.timestamp.split(' ')[1] + ' ' + message.timestamp.split(' ')[2] + '</span>';
						out += 'NOTICE:' + message.message + '</span>';
				        $('#chatDiv').append(out);
					break;
					defaut: break;
				}
			}
			// Set chatDiv scroll to max extent
			$('#chatDiv').prop('scrollTop', $('#chatDiv').prop('scrollHeight'));
		}
		// client handler
		$('#clientDiv').html('');
		for(i=0; i < clients.length; i++){
			$('#clientDiv').append('<div class="client-container"><i class="icon-user"></i> ' + clients[i].userid + '</div>');
		}

		return;
	}
	,sendMessage: function(){
		$.ajax({
			 url: '/api/chat/put'
			,method: 'POST'
			,data: {
				 userid: userName
				,message : $('#message').val()
			}
			,dataType: 'json'
			,cache: false
			,success: function(){
				engine.messageSubscriber();
			}
			,error: function(){
				$('<div/>', {
					text: 'Error interacting with /api/chat/put endpoint!'
				})
				.addClass('message-error')
				.appendTo('#chatDiv');
			}
		});
		$('#message').val('');
		return;
	}
}