Скачать или смотреть Iterating MemberInfo Array in Angular: Displaying Two Elements per Row

Discover how to effectively iterate over a custom interface array in Angular and display two elements per row in a grid layout. Learn to solve common errors related to `ngFor` iterations.
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This video is based on the question https://stackoverflow.com/q/68823174/ asked by the user 'stefnto' ( https://stackoverflow.com/u/10640978/ ) and on the answer https://stackoverflow.com/a/68823229/ provided by the user 'Gaël J' ( https://stackoverflow.com/u/5389127/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Iterating MemberInfo Array in Angular: Displaying Two Elements per Row

When working with Angular, one common task is to display a list of items in a structured format. In this guide, we will address a specific problem related to iterating over a custom interface array in Angular and showcasing the items in a grid view. This will help you understand how to effectively use *ngFor for your custom data arrays.

The Problem

You have a scenario where you want to display the details of a user's friends, stored in an array of the custom interface MemberInfo. Your goal is to show two friends per row in a grid view within your HTML template.

The Custom Interface

First, let's look at the defined interface that describes each friend's data:

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

You have created an array of type MemberInfo[] in your Angular component, which stores the friends' information:

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

The HTML Structure

The attempt to display the friends' information in a grid looks something like this:

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

However, you receive an error similar to:

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

This indicates a misunderstanding regarding how to access the array elements.

The Solution

The issue arises because info refers to a single MemberInfo object, not an array. The correct way to access the next item is using the memberInfo array directly with the index i. Here’s how you can modify your template:

Updated HTML Code

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

Key Changes

Accessing the Array Correctly: Instead of using info[i + 1], we switched to memberInfo[i + 1] which correctly references the next element in the memberInfo array.

Conditional Rendering: We added an *ngIf directive to prevent accessing an out-of-bounds index: *ngIf="i + 1 < memberInfo.length". This ensures that we only attempt to display the second member info when it exists.

Conclusion

With this solution, you can effectively display two friends per row in a grid layout while ensuring your code functions correctly without running into errors. Remember to ensure proper array indexing in Angular to prevent runtime exceptions.

Feel free to adapt and expand upon this solution further according to your project’s needs!