Events
13 days ago
- #JavaScript
- #Web Development
- #Events
- Events are actions or occurrences that happen in the system, which the system notifies the code about to react.
- Events can be user interactions like clicks, key presses, or system actions like page loading or form submissions.
- Event listeners are used to detect events, and event handlers are functions that run in response to those events.
- The `addEventListener()` method is the recommended way to attach event listeners to elements.
- Events can be removed using `removeEventListener()` to clean up or change behavior dynamically.
- Multiple event listeners can be attached to the same event, allowing multiple responses to a single event.
- Alternative methods to `addEventListener()` include event handler properties (e.g., `onclick`) and inline event handlers, though the latter is discouraged.
- Event objects provide additional context about the event, such as the target element or specific key pressed.
- Some events can have their default behavior prevented using `preventDefault()`, useful for form validation.
- Events are not limited to web pages; other environments like Node.js or browser extensions have their own event models.