Common React Events: onClick, onChange, onSubmit
In React, events like onClick, onChange, and onSubmit are used to manage user interactions within components. These events are related to actions performed by the user, such as clicking a button, typing into a form, or submitting a form.
Synopsis
In React, events are handled similarly to how they are done in the DOM, but with some differences. Events in React are managed by the JSX system and are normalized to ensure their functionality across all browsers.
- onClick: Triggered when the user clicks on an element (like a button or a div).
- onChange: Used to handle changes in form elements like inputs.
- onSubmit: Triggered when a form is submitted. It is used to handle the submission of form data.
- onKeyDown: Fired when a key is pressed while an element is in focus.
- onFocus: Triggered when an element gains focus.
- onBlur: Triggered when an element loses focus.
- onMouseEnter: Triggered when the mouse pointer enters an element.
- onMouseLeave: Triggered when the mouse pointer leaves an element.
- onMouseMove: Fired when the mouse pointer moves within an element.
- onInput: Triggered when the value of an input field changes, similar to onChange, but triggers more frequently.
- onDrag: Triggered when an element is being dragged.
- onDrop: Triggered when a dragged element is dropped onto a target.
Purpose
Event handling is crucial for creating an interactive experience in React. Events allow the component to react to user actions and, consequently, to update or perform some action, such as submitting data or changing its state.
- Handle click type events, such as buttons.
- Capture input value changes with the onChange event.
- Process forms using the onSubmit event.
Exercises
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