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Lite-Brite Extensions

If the class has extra time, or individuals want to continue building on their Lite-Brite after the workshop, here are some areas to explore!

Let Your User Choose ANY Color!

Physical Lite-Brites are limited to the colors of the little pegs that are provided in the kit. However, building a virtual Lite-Brite really opens up the possibilities!

We can provide a “color picker” input to the user so that they can choose from, literally, any color available on a screen with something like this:

Step 1

In your Lite-Brite replit, add this code to the HTML file, inside of the controls section:

<input type="color" class="color-picker"/>


Let’s break down this newly added line of code:

  • <input /> - the input tag is used to create controls such as text fields, checkboxes, date/time pickers, passwords, and more!
  • type="color" specifies what type of input we’d like the browser to show the user. The type color presents a small box that when clicked, provides several ways for a user to select a very specific color. If you want to explore other types of inputs, change out color for password, range and/or date! You can read all about the input types available on MDN
  • class="color-picker" - this class was applied so we could use CSS styles and, later, access this element in JavaScript

Update the Active Color

As of now, your user should be able to select a new color from the picker. However, the color doesn’t go anywhere. We have to use our programs brain and muscle, JavaScript, to make this happen!

Step 2

Our JavaScript file needs to know about the color picker input in order to keep track of which color was selected. Let’s create a variable that stores the HTML element:

var colorPicker = $('.color-picker');

Now, we need to instruct our program to listen for the users input:

colorPicker.on("input", changeActiveColor);

function changeActiveColor() {
  //code will go here later
}

Step 3

The final step is to take the value from the color picker input, and update the activeColor (declared on line 1 or 2) to hold that new value. Update the changeActiveColor function to include this:

function changeActiveColor() {
  activeColor = colorPicker.val();
}

The .val() method used in the previous snippet takes the value our of an input. Whatever is in the input at the time will be stored in the activeColor variable.

Run the program, and try this functionality out!

Wrap Up