I'm diving deep into React development, and I'm currently building a simple website (yes, I know, very original!). One of the key elements I wanted to include was an image carousel in the hero section.
Now, I've built carousels before using plain JavaScript, and I initially approached this React project with the same mindset. I quickly encountered a crucial difference between the two: state management.
In vanilla JavaScript, I could easily manage the current image by simply updating a variable:
This function, attached to a button click event, would seamlessly cycle through the images.
Translating this to React JSX the code becomes:
The logic is good and working.
However, in React, this direct DOM manipulation doesn't play well with how React manages changes. React utilizes a virtual DOM, which efficiently tracks and updates only the necessary parts of the actual DOM.
To achieve smooth transitions in our React carousel, we need to leverage React's state management. Instead of directly modifying the displayed image, we can use the useState hook to manage the imageIndex within our React component:
The code looks like this:
Then we can add any transition to the images using css:
