Скачать или смотреть How to Fix the InvalidPipeArgument Error in Angular Date Pipe with ngModel

Learn how to solve the "InvalidPipeArgument" error when using Angular's date pipe with ngModel in input fields. We provide an easy-to-follow guide to ensure your selected date displays correctly in calendar inputs.
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This video is based on the question https://stackoverflow.com/q/71032859/ asked by the user 'Robgit28' ( https://stackoverflow.com/u/13106663/ ) and on the answer https://stackoverflow.com/a/71033014/ provided by the user 'Merna Mustafa' ( https://stackoverflow.com/u/9464594/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Fixing the InvalidPipeArgument Error in Angular Date Pipe with ngModel

When building applications with Angular, you might encounter various issues, especially while working with date inputs. One common problem users face is the InvalidPipeArgument error related to the DatePipe. This error arises when Angular is unable to process the given object into a date format correctly, specifically when you want to blend two-way data binding with a date pipe. In this guide, we'll discuss this issue and walk you through the solution step-by-step.

The Problem: Understanding the Error

The error message you may encounter is:

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

This typically happens when you are trying to use Angular’s date pipe in a situation where the input is not in the expected format. If you are using ngModel along with a date pipe on an input, you may find that the selected date doesn't display correctly in your calendar input. This makes it frustrating for users who want to see the selected date immediately reflected in the UI.

Your Current Setup

You might have a setup similar to the following:

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

And your TypeScript might resemble this:

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

Here, you're experiencing issues because of how the data is being handled and processed by Angular.

The Solution: Fixing the Date Pipe Usage

To resolve this issue, we need to ensure that the createdByCutOffDate, which is a Date object, is referenced correctly in your date pipe. Instead of trying to convert the entire Date object with the pipe directly, you should call the date field and then apply the date pipe more effectively.

Step-by-Step Fix

Modify Your HTML: Change how you apply the date pipe to your model. Instead of using:

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

Use:

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

Using this format ensures that the model is still compatible with the input type as <input type="date"> expects a date format like yyyy-MM-dd.

Handle the Change Event: In your (ngModelChange) event handler, continue to parse the date string back into a Date object correctly. This keeps everything in sync.

Corrected Code Example

To clarify, here’s how your markup and component methods would look after the fix:

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

And your TypeScript code remains the same, handling the date input as follows:

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

Conclusion

By ensuring that you format the date correctly for both input and binding, you can eliminate the InvalidPipeArgument error and successfully display the selected date in your calendar input.

Feel free to share your thoughts or any further questions you might have about Angular date handling in the comments below!