"Animating dynamic elements based on conditions in React: A step-by-step

I am currently working on a React application where I am using React Spring for animations. However, I am facing some difficulties in animating certain elements. The primary animation I am experimenting with is a simple opacity transition.

              import { useSpring, animated } from "react-spring";

              /***
              Some code
              ***/

              const styleProps = useSpring({
                 to: { opacity: 1 },
                 from: { opacity: 0 }
              });

1) One of the challenges I am encountering is animating conditional elements. Below is the code snippet for reference:

              <section>
                {!flag ? (
                <animated.div style={styleProps}>
                  Some random text
                </animated.div>
              ) : (
                <animated.div style={styleProps}>
                  To appear with animation
                </animated.div>
              )
             }
             </section>

The issue lies in the fact that the animated.div component from react-spring does not animate as expected. Is there an alternative method for achieving this animation effect without relying on react-spring?

2) Additionally, I have a bootstrap className that is conditionally applied based on a flag. I would like to animate this element as well.

            <animated.div style={styleProps} className={classnames({
                 "col-lg-6": !flag,
                 "col-lg-12": flag
            })}
            >
                Random Content
            </animated.div>

Similar to the previous scenario, the animation for this element is not occurring as desired. What would be the correct approach to achieve the desired animation effect?

Answer №1

It seems like you have many questions. I can provide some insight that may help clarify things for you.

In the example you provided, the useSpring animation is only triggered once. When switching between components using conditional rendering, the animation stops. However, you can re-trigger the animation in useSpring by conditionally changing the 'to' parameter and letting react-spring handle the rendering.

const styleProps1 = useSpring({
   to: { opacity: flag ? 1 : 0 },
   from: { opacity: 0 }
});

const styleProps2 = useSpring({
   to: { opacity: flag ? 0 : 1 },
   from: { opacity: 0 }
});
<section>
  <>
    <animated.div style={styleProps1}>
      Some random text
    </animated.div>

    <animated.div style={styleProps2}>
      To appear with animation
    </animated.div>
  </>
</section>

If you want an element to appear in the same place, you need to use absolute positioning.

You can achieve a similar effect with useTranstion by also using absolute positioning. With this method, the element will be removed at the end of the animation. If you encounter mouse click issues with useSpring, consider trying useTransition as an alternative.

Perhaps this information also addresses your second question. Unfortunately, I am not familiar with bootstrap.

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