JavaScript의 이벤트 작업.

Event Actions in JavaScript

JavaScript is a powerful programming language that is widely used for creating interactive web pages. One of the key features of JavaScript is its ability to handle events. Events are actions that occur in response to user interaction with a web page, such as clicking a button or scrolling the page. In this blog post, we will explore the different types of event actions in JavaScript and how they can be used to create dynamic and engaging web pages.

Types of Event Actions

There are many different types of event actions in JavaScript, each with its own unique properties and uses. Some of the most common event actions include:

Click Event

The click event is triggered when a user clicks on an element on the web page, such as a button or a link. This event can be used to perform a variety of actions, such as opening a new page or displaying a message.

document.getElementById("myButton").addEventListener("click", function() {
  alert("Button clicked!");
});

Mouseover Event

The mouseover event is triggered when a user moves the mouse over an element on the web page. This event can be used to display additional information or to highlight a specific area of the page.

document.getElementById("myElement").addEventListener("mouseover", function() {
  this.style.backgroundColor = "yellow";
});

Scroll Event

The scroll event is triggered when a user scrolls the page up or down. This event can be used to create dynamic effects, such as parallax scrolling or infinite scrolling.

window.addEventListener("scroll", function() {
  console.log("Page scrolled!");
});

Keydown Event

The keydown event is triggered when a user presses a key on the keyboard. This event can be used to perform actions based on user input, such as submitting a form or navigating through a menu.

document.addEventListener("keydown", function(event) {
  console.log("Key pressed: " + event.key);
});

Using Event Actions in JavaScript

Event actions can be used to create dynamic and engaging web pages that respond to user interaction. By using event listeners, you can detect when a specific event occurs and then perform an action in response. For example, you could use the click event to display a message when a user clicks on a button, or you could use the scroll event to create a parallax scrolling effect.

<button id="myButton">Click me!</button>
<div id="myElement">Hover over me!</div>

document.getElementById("myButton").addEventListener("click", function() {
  alert("Button clicked!");
});

document.getElementById("myElement").addEventListener("mouseover", function() {
  this.style.backgroundColor = "yellow";
});

In the example above, we have created a button and a div element on the web page. We have then added event listeners to each element that will trigger when the user clicks on the button or hovers over the div. When the event is triggered, the corresponding function will be executed, displaying a message or changing the background color of the element.

Conclusion

Event actions are an essential part of creating dynamic and engaging web pages in JavaScript. By using event listeners, you can detect when a specific event occurs and then perform an action in response. Whether you are creating a simple button or a complex interactive application, event actions can help you create a more engaging and user-friendly experience for your users.