Скачать или смотреть Resolving the Error: Type 'void' is not assignable to type 'PageEvent' in Angular Pagination

Discover how to fix the TypeScript error related to Angular pagination using MatPaginator. Learn about event handling and return values in TypeScript for smoother pagination functionality.
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This video is based on the question https://stackoverflow.com/q/70433321/ asked by the user 'DeChopper' ( https://stackoverflow.com/u/17539151/ ) and on the answer https://stackoverflow.com/a/70433442/ provided by the user 'Batajus' ( https://stackoverflow.com/u/4661771/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Resolving the Error: Type 'void' is not assignable to type 'PageEvent' in Angular Pagination

If you're developing an Angular application and trying to implement pagination using Material's MatPaginator, you may come across the frustrating error: Type 'void' is not assignable to type 'PageEvent'. This issue often arises when the logic for handling pagination events is not correctly structured, specifically regarding the return value of the method handling those events.

In this post, we will explore the root cause of this error and provide you with a clear and straightforward solution.

Understanding the Problem

The error originates from the line in your HTML template:

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

Here, you're assigning the return value of the OnPageChange method to the pageEvent variable every time the page output emits an event. However, this leads to a conflict when OnPageChange does not actually return a value, resulting in a void type.

Why This Happens

Void Return Type: In TypeScript, a function that does not explicitly return a value defaults to returning void. When you try to assign this void return type to a variable that expects a PageEvent, it raises the error.

The Solution

Step 1: Modify OnPageChange Method

To resolve the error, you have two main options:

Option 1: Return the $event

One approach is to modify your OnPageChange method to return the $event directly:

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

Option 2: Update the HTML Binding

Alternatively, if you do not need to assign pageEvent in the HTML, you can simply call the OnPageChange method without assignment:

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

In this case, you don’t change your method, and it retains its current structure, processing the event without trying to capture its return value.

Final Thoughts

By understanding the function's return type and adjusting either your method or HTML binding accordingly, you will eliminate the Type 'void' is not assignable to type 'PageEvent' error. This change will enable your pagination to function correctly in your Angular application without further issues.

Implementing pagination can sometimes be tricky, but with the right mindset and understanding of TypeScript, you can work through such challenges efficiently. Happy coding!