How to implement a tight transition animation in React using react-transition-group?

Use react-transition-group in React to achieve seamless switching animations

In React development, react-transition-group is a common library for implementing animation switching between components. However, in practical applications, developers often encounter situations where the animation effect is not ideal, such as blank areas appearing when component switching, resulting in the animation not being smooth enough. This article analyzes this problem and provides solutions.

Problem Description: The goal is to realize a component switching animation that slides from right to left, requiring the two components to be closely connected during the animation process without any gaps. But the actual effect is that there is blank space between components.

Question code example:

<switchtransition>
  <csstransition classnames="checkout" key="{this.state.isPhone}" timeout="{500}">
    {this.state.isPhone ? (
      <phone handleback="{()"> this.setPhoneState(false)} handlePhoneClick={this.handlePhoneClick} />
    ) : (
      <main handlephoneclick="{this.handlePhoneClick}"></main>
    )}
  </phone></csstransition>
</switchtransition>

Corresponding CSS style:

 .checkout-enter {
  transform: translateX(100%);
}
.checkout-enter-active {
  transform: translateX(0);
  transition: all 500ms;
}

.checkout-exit {
  transform: translateX(0);
}
.checkout-exit-active {
  transform: translateX(-100%);
  transition: all 500ms;
}

Problem analysis: The above CSS code defines the in-and-out effect of the animation, but does not consider the positional relationship of components during the animation process, resulting in gaps between components.

Solution: The key is to use position: absolute property and precisely control the component's position during the animation process.

Corrected CSS style:

 .checkout-enter {
  position: absolute;
  right: 0;
  transform: translateX(100%);
}
.checkout-enter-active {
  transform: translateX(0);
  transition: all 500ms;
}

.checkout-exit {
  position: absolute;
  left: 0;
  transform: translateX(0);
}
.checkout-exit-active {
  transform: translateX(-100%);
  transition: all 500ms;
}

By setting position: absolute , and positioning the incoming and exiting components to the right and left of the container respectively, ensure that the components are always closely connected during the animation process, thereby eliminating blank areas and seamlessly switching animation effects. This makes the animation smoother and the user experience better.

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