Is there a way to manually trigger a re-render of all React components on a page generated using array.map?

Within my parent component (Game), I am rendering child components (Card) from an array. Additionally, there is a Menu component that triggers a callback to Game in order to change its state. When switching levels (via a button click on the Menu), I want all existing cards to smoothly fade out and then fade back in with new ones, mirroring the fade-in effect applied to freshly rendered Cards. In attempts to achieve this, I have experimented with forceUpdate at various points and even tried passing dummy props to detect any changes. Essentially, I aim to trigger re-renders for all cards currently displayed on the page while simultaneously rendering new ones as needed.

Below is a snippet taken from Game:

{this._gameArray.map( (item, i) => {
  let dummyProp = Math.random();
  return <Card key={i}
           ...
           dummyProp={dummyProp}/>
})}

In addition, here is an excerpt from Card:

componentWillReceiveProps(nextProps) {
  ...
  if (nextProps.dummyProp !== this.props.dummyProps) {
    this.forceUpdate();
  }
}

Although I initially utilized componentWillReceiveProps for another purpose, I decided to experiment with it to monitor changes in the dummyProp. Subsequently, the new Cards are observed fading in smoothly, while the pre-existing ones remain unaffected by the transition.

Answer №1

React has implemented algorithms to determine which components need to be re-rendered. In this scenario, React will not re-render the <Card/> component because you are using indexes as keys and they remain the same. To ensure re-rendering, you should update the key between renders.

A simple solution is to use the index along with a unique identifier in the key, like so:

<Card key={index + '-' + Date.now()} card={card}/>;

By doing this, the <Card/> component will be re-rendered whenever the state of the <Game/> component changes.

If you encounter flashing issues during rapid re-renders, I recommend considering the use of a React animation library such as react-transition-group for smoother transitions.

Answer №2

If you're looking to trigger a different approach, consider implementing a new technique. In order to refresh all the elements whenever there's a change in level, you can introduce a boolean variable. Initially set it to false when initiating the change and then switch it to true once the change is completed or after a certain duration. Subsequently, incorporate a conditional statement for rendering the elements.

{shouldReRender && this._gameArray.map( (item, index) => {
  let placeholderVar = Math.random();
  return <Card key={index}
           ...
           placeholderVar={placeholderVar}/>;
})}

When shouldReRender is true, the cards will be displayed, and if it's false, they won't. By following this method, every time it turns true, all the cards will re-render, effectively achieving the desired outcome.

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