Скачать или смотреть How to Iterate Over Asynchronous Objects in React.js and Display Results

Learn how to effectively iterate over objects returned asynchronously in React.js and render them in your application. This guide provides clear step-by-step instructions and code examples.
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Iterating Over Asynchronous Objects in React.js

If you're working with React.js and dealing with asynchronous data, you may find yourself scratching your head on how to continuously iterate over objects returned asynchronously and display them in your user interface. In particular, utilizing asynchronous functions can sometimes lead to "update not rendering" issues. Fortunately, there are effective strategies to overcome these challenges.

In this post, we will go through a specific scenario where we need to display the results of an asynchronous function call. We will ensure the data returned is displayed properly within our React component.

The Challenge

Let's say you've implemented a function call that verifies the toxicity of a given sentence using TensorFlow's toxicity model. Your function, for instance, might look something like this:

[[See Video to Reveal this Text or Code Snippet]]

The result of this function is an object containing an array of objects. Each of these objects has a label and a results array that shows whether there was a "match" or not, and other probabilities.

However, the biggest issue arises when you try to render these objects in your React component. While you might see the updated state, the component does not reflect these changes.

Breakdown of the Solution

1. Understanding the Data Structure

The example function returns data structured like this:

[[See Video to Reveal this Text or Code Snippet]]

2. Setting Up the Component

You need to properly initialize your state and ensure you're rendering the data correctly. Below is a sample structure of your React component.

Component Structure

[[See Video to Reveal this Text or Code Snippet]]

3. Rendering the Results

In the render method of your component, use the map function to iterate over the objects array from your state, and render a ToxicLabels component for each object.

Additional Considerations

Asynchronous Handling: Ensure that the async function call is correctly awaited to get the desired response before setting the state.

Rendering Condition: The check for this.state.render is a simple way to prevent rendering until your data is ready.

Conclusion

By following these steps, you can effectively iterate over an asynchronous object and display it in your React.js application. Make sure to always structure your data and state properly and employ React's lifecycle methods to manage asynchronous calls effectively.

Now that you're acquainted with rendering asynchronous objects in React, you can handle similar scenarios with confidence! Happy coding!