How to Pass Context to ng-template in Angular: A Guide for Developers

Discover a simple solution to passing context to `ng-template` in Angular using a custom component approach. Streamline your templates and improve code reusability!
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How to Pass Context to ng-template in Angular

Developing dynamic web components in Angular can sometimes lead to challenges, especially when you need to pass data context into ng-template. If you've found yourself trying to use ng-template with a local reference and are confused about how to pass data to each instance, you're not alone.

In this post, we will explore a practical solution to this common problem—enabling us to pass an item context to an ng-template while keeping our Angular code clean and maintainable.

The Problem

Consider a scenario where you have a nz-collapse component looping through a list of items, displaying their names in a collapsible format. The challenge arises when you try to pass each item to an ng-template. The nzHeader property only accepts strings or TemplateRef, leaving little room for dynamic content.

Here’s a brief look at the initial setup:

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

The requirement is to successfully pass each item as context to the ng-template. Since nzHeader does not accommodate this directly, we need to rethink our approach.

The Solution

Instead of relying on ng-template to manage context, we can create a custom wrapper component. This component will accept each item as an input, simplifying our template handling.

Step 1: Create a Custom Component

Define the Component:
Create a new component called CollapseWrapperComponent. This component will take an input of type Item.

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

Design the HTML:
In the HTML of this new component, leverage the ng-content directive.

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

Step 2: Implement the Wrapper in Parent Component

Now, to utilize this CollapseWrapperComponent, update your parent component’s HTML. Here’s how you can use the newly created component in a loop:

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

Benefits of This Approach

Cleaner Code: With the custom component, we handle each item instance conveniently without needing to define complex context passing through templates.

Reusability: The CollapseWrapperComponent is reusable for any set of items you want to collapse, enhancing the component’s versatility.

Maintainability: This method adheres to Angular best practices, ensuring that your code remains easy to maintain and extend.

Conclusion

Passing context to ng-template in Angular doesn't have to be complicated! By creating a simple wrapper component that takes input parameters, you can achieve a clean and efficient implementation. This approach not only solves the immediate problem but also improves code structure and clarity.

Feel free to implement this modified structure in your projects, and enjoy enhanced component functionality in Angular!

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