Odin Etch-A-Sketch

• Course: The Odin Project - Foundations Course
• Exercise: Foundations Course - Project: Etch-A-Sketch

Introduction

In this project, you’ll be creating a pretty neat toy to flex your DOM manipulation skills. You’re going to build a browser version of something between a sketchpad and an Etch-A-Sketch.

Assginment

1. Follow the instructions atop Odin’s Recipes project to set up a Git repository for this project.
2. Create a webpage with a 16x16 grid of square divs.
   • Create the divs using JavaScript. Don’t try making them by hand with copy and pasting in your HTML file!
   • It’s best to put your grid squares inside another “container” div (which can go directly in your HTML).
   • You need to make the divs appear as a grid (versus just one on each line). This is a perfect opportunity to apply what you have learned about flexbox.
   • Be careful with borders and margins, as they can adjust the size of the squares!
   • “OMG, why isn’t my grid being created???”
     • Did you link your CSS stylesheet?
     • Open your browser’s developer tools.
     • Check if there are any errors in the JavaScript console.
     • Check your “elements” pane to see if the elements have actually shown up but are somehow hidden.
     • Go willy-nilly and add console.log statements in your JavaScript to see if it’s actually being loaded.
3. Set up a “hover” effect so that the grid divs change color when your mouse passes over them, leaving a (pixelated) trail through your grid like a pen would.
   • Hint: “Hovering” is what happens when your mouse enters a div and ends when your mouse leaves it. You can set up event listeners for either of those events as a starting point.
   • There are multiple ways to change the color of the divs, including:
     • adding a new class to the div.
     • changing the div’s background color using JavaScript.
4. Add a button to the top of the screen that will send the user a popup asking for the number of squares per side for the new grid. Once entered, the existing grid should be removed and a new grid should be generated in the same total space as before (e.g. 960px wide) so that you’ve got a new sketch pad. Tip: Set the limit for the user input to a maximum of 100. A larger number of squares results in more computer resources being used, potentially causing delays, freezing, or crashing that we want to prevent.
   • Research button tags in HTML and how you can make a JavaScript function run when one is clicked.
   • Also check out prompts.
   • You should be able to enter 64 and have a brand new 64x64 grid pop up without changing the total amount of pixels used.
5. Push your project to GitHub!

Extra credit

Transform the behavior of a square when interacting with the mouse by introducing a series of modifications.

1. Rather than a simple color change from black to white, each interaction should randomize the square’s RGB value entirely.
2. Additionally, implement a progressive darkening effect where each interaction adds 10% more black or color to the square. The objective is to achieve a completely black square only after ten interactions.

You can choose to do either one or both of these challenges, it’s up to you.