Exercise Set 3
Exercise 1 of 12
Watch the
this
video.
Change each button's background color when clicked.
HTML
<button id="colorButton1">Button 1</button> <button id="colorButton2">Button 2</button> <button id="colorButton3">Button 3</button>
JavaScript
let colorButton1 = document.getElementById(`colorButton1`)
let colorButton2 = document.getElementById(`colorButton2`)
let colorButton3 = document.getElementById(`colorButton3`)
colorButton1.addEventListener(`click`, changeColor)
colorButton2.addEventListener(`click`, changeColor)
colorButton3.addEventListener(`click`, changeColor)
function changeColor() {
// your code will appear here
}
Your code
Test your code
Exercise 2 of 12
Change each button's opacity when clicked.
Use the
opacity
style.
HTML
<button id="opacityButton1">Button 1</button> <button id="opacityButton2">Button 2</button> <button id="opacityButton3">Button 3</button>
JavaScript
let opacityButton1 = document.getElementById(`opacityButton1`)
let opacityButton2 = document.getElementById(`opacityButton2`)
let opacityButton3 = document.getElementById(`opacityButton3`)
opacityButton1.addEventListener(`click`, changeOpacity)
opacityButton2.addEventListener(`click`, changeOpacity)
opacityButton3.addEventListener(`click`, changeOpacity)
function changeOpacity() {
// your code will appear here
}
Your code
Test your code
Exercise 3 of 12
Change each image's opacity when clicked.
HTML
<img src="/img/cat.png" id="opacityImage1"> <img src="/img/dog.png" id="opacityImage2"> <img src="/img/wolf.png" id="opacityImage3">
JavaScript
let opacityImage1 = document.getElementById(`opacityImage1`)
let opacityImage2 = document.getElementById(`opacityImage2`)
let opacityImage3 = document.getElementById(`opacityImage3`)
opacityImage1.addEventListener(`click`, changeImageOpacity)
opacityImage2.addEventListener(`click`, changeImageOpacity)
opacityImage3.addEventListener(`click`, changeImageOpacity)
function changeImageOpacity() {
// your code will appear here
}
Your code
Test your code
Exercise 4 of 12
Change each image's rotation when clicked.
Use the
transform
style.
HTML
<img src="/img/cat.png" id="rotationImage1"> <img src="/img/dog.png" id="rotationImage2"> <img src="/img/wolf.png" id="rotationImage3">
JavaScript
let rotationImage1 = document.getElementById(`rotationImage1`)
let rotationImage2 = document.getElementById(`rotationImage2`)
let rotationImage3 = document.getElementById(`rotationImage3`)
rotationImage1.addEventListener(`click`, changeImageRotation)
rotationImage2.addEventListener(`click`, changeImageRotation)
rotationImage3.addEventListener(`click`, changeImageRotation)
function changeImageRotation() {
// your code will appear here
}
Your code
Test your code
Exercise 5 of 12
Change each button's text to `on` when clicked.
HTML
<button id="button1">off</button> <button id="button2">off</button> <button id="button3">off</button>
JavaScript
let button1 = document.getElementById(`button1`)
let button2 = document.getElementById(`button2`)
let button3 = document.getElementById(`button3`)
button1.addEventListener(`click`, changeText)
button2.addEventListener(`click`, changeText)
button3.addEventListener(`click`, changeText)
function changeText() {
// your code will appear here
}
Your code
Test your code
Exercise 6 of 12
Erase each paragraph when clicked.
HTML
<p id="paragraph1">Erase me</p> <p id="paragraph2">Erase me</p> <p id="paragraph3">Erase me</p>
JavaScript
let paragraph1 = document.getElementById(`paragraph1`)
let paragraph2 = document.getElementById(`paragraph2`)
let paragraph3 = document.getElementById(`paragraph3`)
paragraph1.addEventListener(`click`, eraseText)
paragraph2.addEventListener(`click`, eraseText)
paragraph3.addEventListener(`click`, eraseText)
function eraseText() {
// your code will appear here
}
Your code
Test your code
Paragraph 1
Paragraph 2
Paragraph 3
Exercise 7 of 12
Set the paintbrush variable to a color when the dip brush button is clicked.
For example, paintbrush = `yellow`
HTML
<button id="dipBrushButton">Dip brush</button> <button id="applyBrushButton">Apply brush</button> <p id="brushParagraph">Brush color: none</p>
JavaScript
let dipBrushButton = document.getElementById(`dipBrushButton`)
let applyBrushButton = document.getElementById(`applyBrushButton`)
let brushParagraph = document.getElementById(`brushParagraph`)
let paintbrush
dipBrushButton.addEventListener(`click`, dipBrush)
applyBrushButton.addEventListener(`click`, applyBrush)
function dipBrush() {
// your code will appear here
brushParagraph.innerHTML = `Brush color: ${paintbrush}`
}
function applyBrush() {
this.style.backgroundColor = paintbrush
}
Your code
Test your code
Brush color: none
Exercise 8 of 12
Set the opacity variable to an opacity value when the select opacity button is clicked.
HTML
<button id="selectOpacityButton">Select opacity</button> <button id="applyOpacityButton">Apply opacity</button> <p id="opacityParagraph">Selected opacity: none</p>
JavaScript
let selectOpacityButton = document.getElementById(`selectOpacityButton`)
let applyOpacityButton = document.getElementById(`applyOpacityButton`)
let opacityParagraph = document.getElementById(`opacityParagraph`)
let opacity
selectOpacityButton.addEventListener(`click`, selectOpacity)
applyOpacityButton.addEventListener(`click`, applyOpacity)
function selectOpacity() {
// your code will appear here
opacityParagraph.innerHTML = `Selected opacity: ${opacity}`
}
function applyOpacity() {
this.style.opacity = opacity
}
Your code
Test your code
Selected opacity: none
Exercise 9 of 12
Set the fontSize variable to a number when the select font size button is clicked.
HTML
<button id="selectFontSizeButton">Select font size</button> <button id="applyFontSizeButton">Apply font size</button> <p id="fontSizeParagraph">Selected font size: none</p>
JavaScript
let selectFontSizeButton = document.getElementById(`selectFontSizeButton`)
let applyFontSizeButton = document.getElementById(`applyFontSizeButton`)
let fontSizeParagraph = document.getElementById(`fontSizeParagraph`)
let fontSize
selectFontSizeButton.addEventListener(`click`, selectFontSize)
applyFontSizeButton.addEventListener(`click`, applyFontSize)
function selectFontSize() {
// your code will appear here
fontSizeParagraph.innerHTML = `Selected font size: ${fontSize}px`
}
function applyFontSize() {
fontSizeParagraph.style.fontSize = `${fontSize}px`
}
Your code
Test your code
Selected font size: none
Exercise 10 of 12
Set the width variable to a number when the select width button is clicked.
HTML
<button id="selectWidthButton">Select width</button> <button id="applyWidthButton">Apply width</button> <p id="widthParagraph">Selected width: none</p>
JavaScript
let selectWidthButton = document.getElementById(`selectWidthButton`)
let applyWidthButton = document.getElementById(`applyWidthButton`)
let widthParagraph = document.getElementById(`widthParagraph`)
let width
selectWidthButton.addEventListener(`click`, selectWidth)
applyWidthButton.addEventListener(`click`, applyWidth)
function selectWidth() {
// your code will appear here
widthParagraph.innerHTML = `Selected width: ${width}px`
}
function applyWidth() {
this.style.width = `${width}px`
}
Your code
Test your code
Selected width: none
Exercise 11 of 12
Set the rotation variable to a number when the select rotation button is clicked.
HTML
<button id="selectRotationButton">Select rotation</button> <button id="applyRotationButton">Apply rotation</button> <p id="rotationParagraph">Selected rotation: none</p>
JavaScript
let selectRotationButton = document.getElementById(`selectRotationButton`)
let applyRotationButton = document.getElementById(`applyRotationButton`)
let rotationParagraph = document.getElementById(`rotationParagraph`)
let rotation
selectRotationButton.addEventListener(`click`, selectRotation)
applyRotationButton.addEventListener(`click`, applyRotation)
function selectRotation() {
// your code will appear here
rotationParagraph.innerHTML = `Selected rotation: rotate(${rotation}deg)`
}
function applyRotation() {
this.style.transform = `rotate(${rotation}deg)`
}
Your code
Test your code
Selected rotation: none
Exercise 12 of 12
Set the items variable to a number when the add to cart button is clicked.
HTML
<button id="cartButton">Add to cart</button> <button id="checkoutButton">Checkout</button> <p id="cartParagraph">Items in cart: 0</p> <p id="costParagraph">Cost per item: $10</p> <p id="checkoutParagraph">Total cost: $0</p>
JavaScript
let cartButton = document.getElementById(`cartButton`)
let checkoutButton = document.getElementById(`checkoutButton`)
let cartParagraph = document.getElementById(`cartParagraph`)
let checkoutParagraph = document.getElementById(`checkoutParagraph`)
let items = 0
cartButton.addEventListener(`click`, addToCart)
checkoutButton.addEventListener(`click`, checkout)
function addToCart() {
// your code will appear here
cartParagraph.innerHTML = `Items in cart: ${items}`
}
function checkout() {
checkoutParagraph.innerHTML = `Total cost: $${items * 10}`
}
Your code
Test your code
Items in cart: 0
Cost per item: $10
Total cost: $0