CSC436: Lecture 1 (The web platform: HTTP and the DOM (HTML, CSS and Javascript))

Contents [0/22]

Are You In The Right Room? [1/22]
Admin: Course Overview [2/22]
Admin: Course Objectives [3/22]
Admin: Prerequisites [4/22]
Admin: Expectations [5/22]
Admin: Textbooks [6/22]
Admin: Discussion Forum [7/22]
Admin: Assessment [8/22]
Admin: Attendance [9/22]
Admin: Contact Information [10/22]
Admin: Course Homepage [11/22]
Admin: Meetups [12/22]
Homework: To do [13/22]
Homework: To hand in [14/22]
Web Platform: General guides [15/22]
Web Platform: HTTP [16/22]
Web Platform: Browsers [17/22]
Web Platform: Playgrounds [18/22]
Web Platform: HTML [19/22]
Web Platform: CSS [20/22]
Web Platform: Javascript [21/22]
Web Platform: Demos! [22/22]

Are You In The Right Room? [1/22]

Course: CSC436 (Web Applications)

Instructor: James Riely

Admin: Course Overview [2/22]

This course covers the design and development of modern web applications and their interaction with web services. The primary focus is on client-side web applications using AJAX-techniques to access web services.

Possible topics include:

Admin: Course Objectives [3/22]

The right mix of

Admin: Prerequisites [4/22]

CSC 435 (Distributed Systems) and

CSC 447 (Programming Languages)

Admin: Expectations [5/22]

This is an advanced class expecting you to be a partner more than a student. You really do need to be self motivated. But that should be easy: the stuff we are doing is interesting, fun and will get you a job.

See this class as an opportunity for you to create great resume material and build something you love.

If you put in effort, you will get a lot out of this class. If you don't, you won't.

Inspiration. More. More [Search]. More [Search].

Admin: Textbooks [6/22]

We will use a lot of web resources.

There will be only one required text, ng-book 2, but we won't use it the first week.

Admin: Discussion Forum [7/22]

We will use google groups for discussion:

You must subscribe to the course discussion forum on google groups. Do it as soon as possible.

The discussion forum is an extension our time in class. This is particularly great for students that miss the live lecture. If you are watching the class online, you should write down any questions that arise, including the time from the recording for reference. Then send the list of questions to me, and I will post a reply to the group.

I will also use Teamviewer for communication. With teamviewer, you can show me your computer screen while we talk over the phone.

Admin: Assessment [8/22]

Grades will be computed from the following:

DePaul's academic integrity policy

Admin: Attendance [9/22]

You must attend class!

Admin: Contact Information [10/22]

Instructor:James Riely
Home Page:
Address: School of Computing, DePaul University
243 South Wabash Avenue
Chicago, IL 60604-2301
Office:CDM 845
Office Hours
Class Page:
Class Hours: Tue 5:45pm-9:30pm in CDM 206 [Section 701]
Online, Anytime [Section 710]

My coordinates:

Contact by phone:

Contact by email:

Admin: Course Homepage [11/22]

Course homepage:

Admin: Meetups [12/22]

Chicago has lots of meetups you may want to check out


Homework: To do [13/22]

Occasionally I do Node development in a Windows environment and wanted to
share some of the tools I use. I am by no means a Windows expert nor is this
meant to be a complete list - please feel free to contribute.


Visit the Node website <> and Install the latest
version per class instructions. *Ensure that Node is added to PATH* (should
be by default). Open cmd and run node -v and npm -v to ensure everything is
installed correctly. Run the javascript console with node -i


cmd should work just fine for node/npm, but if you would prefer a UNIX-like
shell, there are a couple of options:

   - Babun <> (Personal Favorite): an extension of
   cygwin which comes with a bunch of pre-installed packages 

   - Cygwin <>: Probably the most popular windows 

   - Git Bash <>: Git for Windows works
   just like a bash terminal 

Text Editors and IDEs 

   - VS Code <> (Personal Favorite): Great 
   lightweight texted editor. Has great code completion, however, snippets
   need to be added via extensions 

   - VS Studio 2015 Community with Node Tools for VS 
   <>: Great for
   larger projects. Great code completion and snippets out of the box. If you
   like JetBrains products I recommend installing the Resharper Plugin

   - Webstorm <>: I don't have much 
   experience with WS but it should be very similar to VS. May need to install 
   plugins for Angular(2) 

Other command line (bash like) tools to consider for windows are:

ConEmu -
Cmder -

If you're used to eclipse as IDE you can try the
Enide (nodeclipse) -  
It can be a challenge to work with though.

Package managers for older versions of windows:

nuget -
chocolatey -

Homework: To hand in [14/22]

Here is a controller for a simple calculator, written in Java.

Copy and paste this onto your home machine and run it.

To watch it work, you should run it and type in one character per line on the console, like this (output in red):

val:1 old:0 op:= isClean:false
val:11 old:0 op:= isClean:false
val:11 old:11 op:* isClean:true
val:2 old:11 op:* isClean:false
val:22 old:2 op:= isClean:true
val:22 old:2 op:+ isClean:true
val:3 old:22 op:+ isClean:false
val:33 old:22 op:+ isClean:false
val:55 old:33 op:= isClean:true

The val is what is displayed on the face of the calculator.

Your homework is to write version of this in raw javascript, with html and css by adapting this code to javascript and providing a view.

Here is an example, which was generated by translation from source written in agda [Search].

Your app should allow input by tapping the buttons, or by pressing the keys on a keyboard.

This code works without parentheses. If you are interested in how to add them, see here [Search].

import java.util.Scanner;
public class ZSimpleCalculator {
  int val = 0;            // the current value
  int old = 0;            // the old value 
  char op = '=';          // the previous operation
  boolean isClean = true; // is the new value clean?
  public String toString () {
    return String.format ("val:%d old:%d op:%c isClean:%b", this.val, this.old, this.op, this.isClean);
  public void process (char c) {
    if (isClear (c)) {

      this.val = 0;
      this.old = 0;
      this.op = '=';
      this.isClean = true;
    } else if (isDigit (c)) {
      int d = evalDigit (c);
      if (this.isClean) {
        // start a new value
        this.old = this.val;  
        this.val = d;
      } else {
        // add to the existing value
        this.val = (this.val * 10) + d;
      this.isClean = false;
    } else if (isOp (c)) {
      int v = evalOp (this.op, this.old, this.val);
      if (! this.isClean) {
        // start a new value
        this.old = this.val;  
      this.val = v;
      this.op = c;
      this.isClean = true;

  public static boolean isOp (char c) {
    switch (c) {
    case '=' : return true;
    case '+' : return true;
    case '-' : return true;
    case '*' : return true;
    return false;
  public static int evalOp (char c, int m, int n) {
    switch (c) {
    case '=' : return n; // m is the old value, n is the new value
    case '+' : return m + n;
    case '-' : return m - n;
    case '*' : return m * n;
    throw new Error ();
  public static boolean isDigit (char c) {    
    return c >= '0'  && c <= '9';
  public static int evalDigit (char c) {    
    return c - '0';
  public static boolean isClear (char c) {    
    return c == 'c';
  public static void main (String[] args) {
    ZSimpleCalculator eval = new ZSimpleCalculator ();
    Scanner in = new Scanner (;
    while (in.hasNext ()) {
      String s = in.nextLine ();
      for (int i = 0; i < s.length(); i++){
          char c = s.charAt(i);  
          eval.process (c);
          System.err.println (eval.toString ());
    in.close ();

Web Platform: General guides [15/22]

Web Platform

Mozilla HTML element reference

DOM events


(html) (css) (bootstrap) (javascript) (jquery)


HTML for beginners

Web Platform: HTTP [16/22]


http tutorials

HTTP: The Protocol Every Web Developer Must Know - Part 1

HTTP: The Protocol Every Web Developer Must Know - Part 2

HTTP (HyperText Transfer Protocol) Basics

Web Platform: Browsers [17/22]


What Every Frontend Developer Should Know About Webpage Rendering

How Browsers Work: Behind the scenes of modern web browsers

Web Platform: Playgrounds [18/22]

There are many javascript playgrounds









Javascript visualizer

Web Platform: HTML [19/22]


HTML element reference

Web Platform: CSS [20/22]


CSS Selectors

Web Platform: Javascript [21/22]


Corin Pitcher's notes on javascript

Corin Pitcher's notes on javascript oop

Java development 2.0: JavaScript for Java developers

A Survey of the JavaScript Programming Language

Javascript visualizer

Selecting DOM elements in javascript [Search]

Javascript events

Concurrency model and Event Loop

Eloquent JS

You don't know JS

Javascript the definitive guide

Web Platform: Demos! [22/22]

Viewing the DOM/documents using developer tools: It's a tree!

Messing around with CSS and HTML using Liveweave

Messing around javascript using Javascript visualizer and JSBin


console.log ("hi");
document.body.innerHTML = "<p>pizza</p>";

let x = document.getElementById ("x");
console.log (x);
x.innerHTML = "hi";

function f () {
  console.log ("pizza");
  let y = document.getElementById ("y");
  y.innerHTML = "Pushed";


<p class="a" id="x">
<p class="a">
<button id="y" onclick="f()">Push me</button>

Revised: 2008/03/17 13:01