Скачать или смотреть How to Fix the No Pipe Found Error in Angular (2+)

Discover how to resolve the `No Pipe Found` error in Angular when using custom pipes and learn about the importance of declarations in Angular modules.
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How to Fix the No Pipe Found Error in Angular (2+)

When working with Angular applications, developers often create custom pipes to transform data in templates. While this can be a powerful feature, it's not uncommon to encounter issues such as the dreaded error: "No pipe found with name '...'". This post will guide you through understanding this error and present a clear solution to resolve it.

Understanding the Problem

Recently, a developer faced the error:

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

This error indicates that Angular can't find the custom pipe you are trying to use in your component. Below is the context of the code structures involved, along with the module setups causing this error.

Code in Question

You declared your pipe in filter.pipe.ts:

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

You tried to use this pipe in your component's HTML:

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

However, since the component that uses this pipe is part of a lazy-loaded module, it needs to declare the pipe in that specific module to be recognized.

Solution Steps

To resolve this issue, follow these steps, ensuring that your custom pipe is correctly declared in the appropriate Angular module.

Step 1: Declare the Pipe in the Correct Module

You need to add the FilterPipe to the declarations of the PortfolioModule, where the pipe is being used. Here’s how you should adjust your portfolio.module.ts file:

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

Step 2: Remove from App Module

Since the FilterPipe will now be part of PortfolioModule, you should remove the FilterPipe declaration from the AppModule. This prevents conflicts and keeps modules clean.

Step 3: (Optional) Create a Shared Module

If you plan to use the FilterPipe or any other similar pipes across multiple modules, consider creating a SharedModule. This module can include commonly used components, directives, or pipes and help avoid redundancy:

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

Remember to import this SharedModule in any module where you wish to use the FilterPipe.

Conclusion

By ensuring that your custom pipes are declared in the right modules, you can avoid Angular's common pitfalls such as the "No pipe found" error. Always check that the components, pipes, and directives you're using in your templates are declared in the module that contains your component. Happy coding!