Mastering ngModel with ng-template in Angular

Learn how to effectively use `ngModel` with `ng-template` and `ng-container` in Angular applications. This guide provides step-by-step solutions and common pitfalls to avoid.
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This video is based on the question https://stackoverflow.com/q/74434213/ asked by the user 'manjiro sano' ( https://stackoverflow.com/u/19160227/ ) and on the answer https://stackoverflow.com/a/74434854/ provided by the user 'manjiro sano' ( https://stackoverflow.com/u/19160227/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Mastering ngModel with ng-template in Angular

Are you struggling to use ngModel inside ng-template while working on your Angular application? You're not alone! This common issue often leaves developers perplexed, particularly when integrating dynamic cells in tables alongside libraries like PrimeNG. In this post, we’ll explore the problem and present a clear solution to help you effectively manage your Angular templates.

Understanding the Problem

When trying to implement editable and read-only cells in an Angular table, developers often encounter the error message:

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

This error usually stems from the incorrect way data is passed to your templates, especially when using ngModel. Let's take a closer look at the code that triggered this error in the first place.

Original Code Block

Here's a simplified version of the code that led to the error:

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

Implementing the Solution

The solution to this problem lies in how you manage the data context when passing it to your templates. Here’s a detailed breakdown of the corrected implementation:

Step 1: Modify the Context

Instead of passing a single property as context, you need to pass the entire row along with the attribute you want to edit.

Here's the revised code block:

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

Key Changes Explained

Context Update: Instead of using $implicit, we use an object that holds both the row and the name of the property being edited. This way, we can easily reference multiple attributes if needed.

Template Variables: We updated template variables in the ng-templates to accept row and name. This makes the binding clearer and adheres to Angular’s best practices.

Dynamic Binding: We ensure that when the input field is edited, we directly bind the ngModel to the corresponding property of the row using [(ngModel)]="row[name]", allowing Angular to handle the two-way data binding seamlessly.

Conclusion

By refining how you pass data to your templates, you can avoid common pitfalls surrounding the usage of ngModel within ng-template. Remember to always check the context and make sure to pass the right references so that Angular can manage the data binding correctly.

Now you should be able to integrate ngModel with ng-template effortlessly in your Angular applications. Keep practicing, and you'll certainly master dynamic table cells with ease!

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