ngFor with index as value in attribute

How to Solve the ngFor Index as Value in Attribute Problem 👣🔢

So, you want to include the index value of an ngFor loop in an attribute using Angular? 🤔 No worries, mate! I'm here to guide you through this common confusion 🤓.

Understanding the Problem 🕵️‍♀️

The code you shared attempts to store the index value in the data-index attribute, but it didn't work as expected. Let's dig deeper and figure out why!

<ul *ngFor="#item of items; #i = index" data-index="#i">
    <li>{{item}}</li>
</ul>

The Solution: Using Attribute Binding 🤝✨

To include the index value in the attribute, you need to use attribute binding in Angular 😎. By enclosing the attribute value in square brackets, you tell Angular to evaluate and assign the value dynamically. Let's update the code accordingly:

<ul *ngFor="let item of items; let i = index" [attr.data-index]="i">
    <li>{{item}}</li>
</ul>

By using [attr.data-index], we are binding the i variable (index) to the data-index attribute, ensuring the value is properly evaluated and assigned 🤩.

Live Demo to the Rescue! 🚀🔍

I've created a Plunker demo for you to see this solution in action: Demo Link. Just click and play around with the code to understand the solution better.

Wrap-Up and Call-to-Action 🎁📣

There you have it! Now you know how to store the index value in the data-index attribute using Angular's ngFor. You are ready to rock with dynamic attribute values in your Angular projects! 🙌🚀

If you found this guide helpful, give it a thumbs up 👍 and share it with your fellow Angular enthusiasts! Don't hesitate to leave a comment below if you have any questions or need further assistance. Let's keep learning and coding together! 💪💻