Скачать или смотреть Understanding Angular *ngFor - How to Loop Through Arrays Correctly

Learn how to effectively use Angular's `*ngFor` directive to loop through arrays and solve common issues.
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Understanding Angular *ngFor - How to Loop Through Arrays Correctly

When working with Angular, one common frustration that developers face is the use of the *ngFor directive for looping through arrays. If you've encountered an error like "Cannot find a differ supporting object '[object Object]' of type 'object'. NgFor only supports binding to Iterables such as Arrays," you're not alone. This guide will delve into this issue and guide you through a straightforward solution.

The Problem: Understanding the Error

The error message is quite specific and indicates that the *ngFor directive is struggling with an object that is not iterable. In Angular, the *ngFor directive is designed to work with arrays and other iterable objects.

Here’s the example that triggered the error:

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

In the corresponding HTML:

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

As the error suggests, an attempt is made to iterate over an object called profile, which contains properties that are arrays, rather than iterating directly over an array itself.

The Solution: Create an Array of Objects

To comply with the requirements of *ngFor, you need to structure your data as an array of objects. Here’s how you can modify your code:

Update TypeScript Code

Instead of storing names and ages as properties in a single object, you can create individual objects for each profile. This allows you to have a properly formatted array that *ngFor can handle.

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

Update HTML Code

Next, update your HTML to iterate over this new array of objects:

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

What's Changed?

Created an Array: The profiles array now contains objects representing each individual profile, which meets the requirements of *ngFor.

Updated Iteration: The *ngFor directive now successfully loops through the profiles array, allowing Angular to render your data without any errors.

Conclusion

Understanding how to properly use the *ngFor directive in Angular is essential for efficient data rendering. Always ensure that you are passing an iterable object, such as an array, to *ngFor. By structuring your data correctly with arrays of objects, you can avoid common errors and make your code cleaner and more effective.

Next time you encounter the error regarding the "differ," remember that converting your objects into an array format is the key to unlocking the power of Angular's *ngFor. Happy coding!