CS 651 Fall 2021 Homework 4

DOM Manipulation, HTML Widgets, DOM Events, CSS Box, SVG DOM

Dr. Greg M. Bernstein

Due Friday, September 15th, 2021 by 11:59PM, 50 points.

General Instructions

In this homework is to continue working with HTML, CSS, and JavaScript. In particular we will work with the DOM to create elements, respond to button clicks, use CSS to style pages and sections of pages, and to produce an information “dialog”.

Create and Use a new Branch hw4

We will create a new git branch called hw4 (starting from your ‘hw3’ branch) for use in this assignment. The branch you create must exactly match the one I’ve given you for you to receive any credit for this homework.

Prior to creating this new branch make sure your working directory is “clean”, i.e., consistent with the last commit you did when you turned in homework 3. Follow the procedures in GitHub for Classroom Use to create the new branch, i.e., git checkout -b hw4. Review the section on submission for using push with a new branch.

Use README.md for Answers

You will modify the README.md file to contain the answers to this homework.

# Homework #4 Solution
**Your name**
**NetID: yourNetID**


Question 1. (10 pts) Club Events from JavaScript Data

1(a) Create Event/Activity Data

Generate a list of at least three events (scheduled activities) for your club. Each event will be a JavaScript object with at least name and date properties (you can add more as appropriate for your club), store these events as an array of JS objects in the file eventData.js. Show a portion of your data here. Mine looks like:

// Foiling club year 2020 events
events = [{"name": "Happy Tide Tuesdays",
           "dates": ["March 10th", "March 24th", "April 28th", "May 26th",
                     "June 9th", "June 23rd", "July 7th", "July 21",
                     "July 28th", "August 4th", "etc..."]},
         {"name": "Racing Saturdays",
          "dates": ["May 23rd", "June 20th", "July 25th",
                    "August 22nd", "September 19"]},
         {"name": "Alcatraz Rounding Sundays", "dates": ["Sundays in July, August, and September if conditions are appropriate"]}];

Yours must be different from mine! You can organize the data into objects as you like!

1(b) Update/Prepare Page for DOM manipulation

Update your club activity page, by removing any hardcoded club events/activities from the HTML table from the previous assignment. Import your data file using a script tag in the <head> section. Hint: adding an id to the appropriate element can make the next step easier.

1(c) Generate Elements from Data

Using an internal JavaScript script located right before the closing body tag, use the DOM interface to add rows and data elements to the table corresponding to the data in eventData.js. You cannot use any for, while, or do loops! Only use the basic DOM interfaces covered in the course slides!

Show your code (only, not HTML) here and a screenshot. Mine looks like:

Generated Event Table

Question 2. (10 pts) Club Application Page Part 1

2(a) Create a Club Application Page

We need a page for new members to apply to your club. Create an application page that contains at least the following inputs: name, email, password, <select> control. You can use the <select> control to get the user to respond with a specific choice. Typical users are “where did you hear about us”, or in my club I ask them about their skill level. No styling is required here (we will wait until we learn about CSS grid layout!).

Show a screenshot of this page here. Mine looks quite ugly:

Application Page Screenshot

2(b) Update Menus

Update menus on all pages to link to this page and this page to link to all the others. Show the <nav> element you used on your membership page here.

Question 3. (10 pts) SVG DOM Fun

Note: The functionality described here must work on your deployed site to receive full credit.

3(a) Login Page/SVG Doodles

We don’t have a server to respond to our login page so instead we are going to let our users create some drawings on a page via a random shape generator.

Add a new section elements to your page to hold the “SVG doodle”. Within it you will need an <svg> element, an “add” button and a “clear” button. Use some CSS to make this look reasonable. I used an internal CSS style sheet rather than adding page specific styling to my general site style sheet.

I get something like:

Doodle Section with drawing area

Show the HTML you added for the “doodle” section here.

3(b) Button click handlers

Whenever the user clicks the “add” button you should add an SVG shape (you cannot use a square) to a random location within the SVG element. You must vary at least one other parameter of the shape randomly. When the user presses the “clear” button you should remove all the shapes from the drawing. Add this script to the bottom of the HTML file right before the closing body tag.

After clicking the add button many times I get something like:

Doodle drawing after “adds”

Show your JavaScript code here.

Question 4. (15 pts) Club Application Form, DOM events

Note: The functionality described here must work on your deployed site to receive full credit.

4(a) Club Application Validation

For each input on your club application page we want to have some basic validation checks or constraints. You can see a list of all <input> attributes at MDN: Input. For each of your inputs use the: maxlength, minlength, required attributes for basic validation in combination with the pseudo-classes :valid and :invalid to show the user feedback on their inputs.

Here is a screenshot of my application page with good email, bad password, and missing name.

Invalid inputs

Here is a screenshot of the application page with all valid inputs.

Invalid inputs

Show the portion of the HTML for this page that includes the inputs here.

4(b) Thank you “dialog”

Create a <section id="ThanksDialog"> to contain a heading thanking them for applying to your club and containing summary information. When they click the apply button you will grab information from the application and summarize it in a <p> element in this section. You will do this using JavaScript. Add at least a border for some temporary styling and add a close button. Note: do not use the HTML5 <dialog> element for this as it is not that well supported yet. We are creating our own with JS and CSS.

Thank you “dialog”

4(c) Show and Hide the “dialog”

It doesn’t make sense to show the “dialog” until after the user has applied. To fix this set the CSS display property to none.

Now create a class show that you will toggle via JavaScript that sets the display property to block. In addition we want this “dialog” (our section element) to take over the entire screen as shown below:

Modal dialog look and feel

Hints: Use fixed positioning. Use transparency for the background color. I had to use an extra <div> element to contain the heading and text so I could set a different background color.

Show the CSS for the dialog and show class here.

Show the final JavaScript for this functionality here.

Question 5. (5 pts) Deployment

Deploy your updated web site to a server and give the URL here. Make sure to test your site!