Utilizing Mouseover Event to Create a Loop Function in Pure Javascript

Question

Utilizing Mouseover Event to Create a Loop Function in Pure Javascript

My goal is to design a carousel with images and have it horizontally scroll when the user hovers over the left or right side of the div. I've created two "invisible" divs for the controls on the left and right, each equipped with eventListeners:

right.addEventListener("mouseover", goRight)

function goRight() {
    document.getElementById('images').scrollLeft += 20;
}

left.addEventListener("mouseover", goLeft)

function goLeft() {

    document.getElementById('images').scrollLeft -= 20;
}

Currently, when I hover over the controls, the scrolling happens just once. To achieve continuous scrolling until mouseout, how can I make goRight()/goLeft() loop while hovering over the controls?

javascript mouseover

Answer 1

Answer №1

To address this issue, you can utilize the setInterval() function and ensure it is terminated on mouseout. By saving the interval id and executing clearInterval() when mouseout event occurs:

const delayTime = 100;
let timerId;

function moveLeft() {
  timerId = setInterval(
    () => (document.getElementById('images').scrollLeft -= 20),
    delayTime,
  );
}

function moveRight() {
  timerId = setInterval(
    () => (document.getElementById('images').scrollLeft += 20),
    delayTime,
  );  
}

function stopMovement() {
  clearInterval(timerId);
}

left.addEventListener('mouseover', moveLeft);
left.addEventListener('mouseout', stopMovement);
right.addEventListener('mouseover', moveRight);
right.addEventListener('mouseout', stopMovement);

Answer 2

To address this issue, you can utilize the setInterval() function and ensure it is terminated on mouseout. By saving the interval id and executing clearInterval() when mouseout event occurs:

const delayTime = 100;
let timerId;

function moveLeft() {
  timerId = setInterval(
    () => (document.getElementById('images').scrollLeft -= 20),
    delayTime,
  );
}

function moveRight() {
  timerId = setInterval(
    () => (document.getElementById('images').scrollLeft += 20),
    delayTime,
  );  
}

function stopMovement() {
  clearInterval(timerId);
}

left.addEventListener('mouseover', moveLeft);
left.addEventListener('mouseout', stopMovement);
right.addEventListener('mouseover', moveRight);
right.addEventListener('mouseout', stopMovement);

Answer 3

Answer №2

If you want to detect when a user hovers over an element, you can create a Boolean variable that turns 'true' when the mouse is on top of it.

// for the right side:
let hoveringOverRight = false;

right.addEventListener("mouseenter", function(){
    hoveringOverRight = true;
});
right.addEventListener("mouseleave", function(){
    hoveringOverRight = false;
});

You can then use a set interval function to control the speed at which this check occurs.

window.setInterval(function(){
  if (hoveringOverRight)
  /// Add scroll logic here
}, 300);

Remember to repeat the same process for the left side as well.

Answer 4

If you want to detect when a user hovers over an element, you can create a Boolean variable that turns 'true' when the mouse is on top of it.

// for the right side:
let hoveringOverRight = false;

right.addEventListener("mouseenter", function(){
    hoveringOverRight = true;
});
right.addEventListener("mouseleave", function(){
    hoveringOverRight = false;
});

You can then use a set interval function to control the speed at which this check occurs.

window.setInterval(function(){
  if (hoveringOverRight)
  /// Add scroll logic here
}, 300);

Remember to repeat the same process for the left side as well.

Utilizing Mouseover Event to Create a Loop Function in Pure Javascript

Answer №1

Answer №2

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