Template Driven Form - Custom validator directive angular | Angular tutorial English (Session-253)

Template Driven Form – Custom Validator Directive in Angular | Angular tutorial in English (Session-253)

In this Angular session, learn how to create and use a Custom Validator Directive in Template-Driven Forms to implement complex, reusable validation logic that cannot be achieved with built-in validators like required, minlength, maxlength, or pattern.

A custom validator directive allows you to define your own validation rules (e.g., no spaces allowed, forbidden words, strong password rules, domain-restricted emails, matching fields, etc.) and apply them directly in the template just like any other Angular validator.

Angular automatically runs your custom validator, updates form control validity, and provides error objects that you can display inside the template.

What You’ll Learn in This Video:

1.What a custom validator is and why you need it

2.How to create a custom validator directive using NG_VALIDATORS

3.Applying your custom validator in a template-driven form

4.Returning error objects and reading them inside HTML

5.Creating reusable validators: no-space, no-special-symbols, forbidden words

6.How Angular triggers your validator on every input update

7.Best practices for writing clean, reusable, and configurable custom directives

FAQs (Custom Validator Directive)

Q1: What is a custom validator directive in Angular?
Q2: How do I create a custom validator for template-driven forms?
Q3: Can I pass parameters (like forbidden words) to a custom validator?
Q4: How do I show error messages from my custom validator?
Q5: Can custom validators work along with built-in validators?

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