Creating a Custom Validation Service for Optional Email Fields in Angular 10

Описание: Learn how to implement a custom validation service in Angular 10 to ensure email fields handle null values gracefully while still validating email formats.
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This video is based on the question https://stackoverflow.com/q/65423246/ asked by the user 'Lajith' ( https://stackoverflow.com/u/7273263/ ) and on the answer https://stackoverflow.com/a/65423348/ provided by the user 'PMO1948' ( https://stackoverflow.com/u/14492841/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Creating a Custom Validation Service for Optional Email Fields in Angular 10

In today's web development landscape, ensuring user input validation is critical. This is especially true when dealing with email addresses in forms. If you're using Angular 10 and need to handle optional email fields while still validating their format, you might be facing some challenges when the field is null. In this guide, we’ll explore the problem and provide a practical solution to create a custom validation service that accommodates null values effectively.

Understanding the Problem

You have a validation service designed to check the format of an email address. The validation works perfectly when the email is an empty string, but issues arise when the email field is set to null. While it's acceptable for this field to be optional, your validation logic needs to ensure that null values are appropriately handled without breaking the validation process.

Here’s a snippet of your email validation code:

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

This code works for scenarios where the email is an empty string but fails when it encounters a null value.

The Solution

The good news is, you can easily modify your validation function to accommodate null values. The key is to update the validation logic to check for null conditions before attempting to run the regular expression match. Here’s how you can implement this:

Updated Validation Logic

To handle the optional condition, replace the current validation logic with the following:

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

Complete Validator Example

Here’s how your complete email validation function would look after incorporating the above change:

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

Conclusion

By adding a simple check for null values at the beginning of your validation logic, you can effectively handle optional email fields in Angular 10. This ensures that your users can leave the email field blank or set it to null without any validation issues while keeping the functionality intact for correctly formatted email addresses.

Feel free to incorporate this adjustment into your Angular project and enhance your form validation capabilities!