CSS Transitions with React State Changes
Trigger CSS transitions by toggling class names with React state — opacity, transform, and color transitions.
What Is a CSS Transition
A CSS transition smoothly interpolates a property between two values over time instead of snapping instantly. You declare it on the element with transition: property duration timing-function delay.
In React you usually do not animate inline values manually. Instead you toggle a class or style with state, and CSS handles the in-between frames for you.
Triggering a Transition by Toggling a Class
The common pattern is to keep a boolean in useState and swap a CSS class when it changes. When the class changes, the target property gets a new value and CSS animates the difference.
For example isOpen drives whether the element has the open class, and the open class sets a different height or transform.
All lessons in this course
- CSS Transitions with React State Changes
- CSS Keyframe Animations with React
- useLayoutEffect for Pre-Animation Measurements
- Enter and Exit Animations Without a Library