Here is where we'll attach the scroll event listener, as well as the function that should run when the user scrolls. We use React's useLayoutEffect to run code before the component mounts. Basically here's everything we need to do:Ĭreate a "ref" in React to keep track of our element (the HTML wrapper, like a ) const ourRef = useRef ( null ) return They go over the basics in more detail there. I found an article on The Practical Dev by that goes over the basics of wiring a React component up to the scroll event. For the exitActive animation sate, we add the class animate_animated animate_flipOutX.Īs for the child of CSSTransition we pass the Alert component, which sets the variant and text based on the value of isDanger.So how do these libraries achieve that core functionality - trigger animation based on scroll and element position? This key prop behaves exactly as it would when you render items from an array using map.įor the enterActive animation state, we add the class animate_animated animate_flipInX. When the state variable isDanger changes, the component will be removed and a new one with the new value will be added. setTransitionState ( !transitionState ) } > Īs you can see we pass to SwitchTransition the mode out-in, but this is the default mode so it's optional to pass.įor CSSTransition we pass it the prop key which will be used to enter and exit elements based on the state. First, we need to create a state variable to store and indicate whether the image should be shown or not. Transition is provided as a platform-agnostic base component.įor this example, we'll have a button that will allow us to show or hide a picture of a cat. Generally, CSSTransition is recommended to be used instead of Transition. With the Transition component, you can add CSS styling based on the different states. The recommended component is CSSTransition, but we'll cover both. There are 2 components we can use: Transition and CSSTransition. Let's say we have an element that we want to animate every time it enters or exits. The first use case we'll look at is animating a single element. We'll go over different use cases when it comes to animating elements, and in each use case which component you should use and how you can use them. There are 4 components that it exposes: Transition, CSSTransition, SwitchTransition, and TransitionGroup. React Transition Group exposes the components that will allow you to easily do that. It facilitates adding the animation either through CSS classes or styles when a component enters or exits. React Transition Group does NOT do the animation for you, that is it does not provide the animation. React Transition Group is a library that allows you to add animation on a component or multiple components' entrance and exit. You can find the full code for this tutorial in this GitHub Repository, and you can see a working demo. In this tutorial, we'll cover how to animate components' entrance and exit in React using React Transition Group. It would be nice to animate the items as they are being added or removed from the list. Say you have a list component in React where the user can add or remove items in the list.
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