Скачать или смотреть How to Dynamically Create HTML Elements with ngFor in Angular

Learn how to use `ngFor` in Angular to dynamically generate HTML elements like `mat-cards` using an array of data. Perfect for beginners!
---
This video is based on the question https://stackoverflow.com/q/67676516/ asked by the user 'Vassilis' ( https://stackoverflow.com/u/12738857/ ) and on the answer https://stackoverflow.com/a/67676575/ provided by the user 'Vivek Bani' ( https://stackoverflow.com/u/9648252/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Creating html Elements dynamically using ngFor Angular

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Creating HTML Elements Dynamically with ngFor in Angular

If you're new to Angular and eager to learn how to create HTML elements dynamically, you've come to the right place! In this guide, we'll dive into how to use the powerful ngFor directive to display a list of items—specifically, mat-cards.

The Problem at Hand

Imagine you have a collection of data, and you want to display each item as a card on your webpage. You might write something like this in your HTML:

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

However, after you've set up everything, you find that no cards appear on your page. This can be very confusing, especially if you're just starting out with Angular. Let’s break down what could be going wrong and how to fix it.

Understanding the Solution

To get the cards to display correctly, you'll need to ensure that the data property in your TypeScript code is correctly initialized. Here’s how you can do it:

Step 1: Define Your Data Model

You already have defined an interface for your data called PeriodicElement. This is excellent as it gives structure to each object you plan to use:

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

Step 2: Initialize the Data Array

You're almost there! The key step missing in your TypeScript code is the initialization of the data variable inside the ngOnInit life cycle hook. Here's how you do it:

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

Complete TypeScript Example

Here’s what your TypeScript file might look like with the added initialization:

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

Step 3: Putting It All Together

Now that you have your HTML and TypeScript files set up correctly, your Angular component should look something like this:

HTML:

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

TypeScript:

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

Summary

In summary, the use of the ngFor directive in Angular allows you to create dynamic lists of HTML elements from your data. By ensuring your data is properly initialized in the component class, you can see your mat-cards displayed on the page as intended. If you're still having issues, double-check your console for errors and make sure your Angular Material setup is correct.

Remember, practice is key to mastering Angular, so don’t hesitate to experiment with your code. Happy coding!