Advanced example for eagerly prefetching async data in a React component.

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Advanced example for eagerly prefetching async data in a React component.

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Last edited Mar 28, 2018

Created on Nov 1, 2019

This example demonstrates an advanced React pattern for eagerly prefetching asynchronous data in a component, intended as a performance optimization for low-end devices. The code shows a component that initiates an external async data request in the constructor, before rendering, to prime a cache, then completes the state update in `componentDidMount` after mounting, while guarding against post-unmount updates via a `_hasUnmounted` flag. It uses React’s lifecycle methods and state management, with the `asyncLoadData` function as the external async API. The data source is external and passed via `this.props.someId`, and the rendering approach conditionally shows a loading state until the data arrives.

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