This project was bootstrapped with Create React App.

This is an example application using

• React Transition Group
• Styled Components
• React Hooks

This app builds a very simple application to showcase transitions in and out of individual items within a transition group.

• Click the Add Button to see an item transition in
• Click on the individual item to see it transition out

The main secret sauce is the React-Transition-Group, which allows us to apply classes to enable CSS animations as components are added or removed. In this example a few classes are applied on enter and exit of a Tile.

transition-enter
transition-enter-active
transition-exit
transition-exit-active

<TransitionGroup> needs to be a direct parent to any <CSSTransition> children, otherwise the behavior begins to get wonky.

The App component uses react hooks to store the state and also contains the addItem() and removeItem() functions, which update the state with an updated item list. These two functions are passed via props down the application to where they need to go, as opposed to using context.

The add button receives the addItem() function and runs this function onClick.

The tile group uses CSS grid to show the grid of tiles. It utilizes grid-template-columns: repeat(auto-fill, 220px); to keep the layout responsive by flowing items based on the size of the div. I set the component attribute of <TransitionGroup> to <StyledTile> to ensure I didn't need an additional div in the DOM.

This is where the primary implementation of Transition Group is done. A parent TransitionGroup component holds the child CSSTransition children, which specifies a base class for the CSS transition classes (classNames="transition") creates transition-enter, transition-enter-active, etc.

Receives the removeItem() function via props, becoming the onClick handler. Also gets populated with dummy data provided within the addItem() function to show title, subtitle, and readtime.

I used a modified helper function from one of Wes Bos' React Courses to generate random strings to fill the tiles with, just to make the solution look a bit more realistic and appealing.

Per usual, use npm install to get all the dependencies. In the project directory, you can run:

Runs the app in the development mode.
Open http://localhost:3000 to view it in the browser.

The page will reload if you make edits.
You will also see any lint errors in the console.