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Learn how to set default options for all Angular Material mat-input fields in your Formly forms, enhancing code efficiency and maintainability.
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Streamline Your Angular Formly Inputs with MAT_FORM_FIELD_DEFAULT_OPTIONS

In the world of Angular applications, especially when utilizing Angular Material's components like mat-input, developers often face the challenge of maintaining efficient and maintainable code. One common issue arises when trying to set consistent options across multiple input fields without repeating code unnecessarily. A prominent query in this domain is whether there’s a streamlined way to set default options for all inputs in Angular Formly forms. In this post, we will dive into how to handle this efficiently using MAT_FORM_FIELD_DEFAULT_OPTIONS for Angular Material inputs.

The Problem: Repeating Code in Angular Formly

Suppose you have a dynamic form built with Angular Formly, utilizing Material inputs for better UI/UX. This setup works well, but it often leads to repetitive code. Here's a simplified example of how your fields might look:

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

In the above structure, every input has a templateOptions where you specify the appearance. If you have many inputs, this can quickly become cumbersome, leading to a lack of DRY (Don't Repeat Yourself) principles in your code.

The Solution: Use MAT_FORM_FIELD_DEFAULT_OPTIONS

To set a default appearance for all of your mat-input fields, you can leverage Angular's dependency injection system. By providing default options for MAT_FORM_FIELD_DEFAULT_OPTIONS, you can ensure that all inputs inherit the desired configuration. Here’s how you can implement this:

Step 1: Import Required Module

Make sure you have imported MAT_FORM_FIELD_DEFAULT_OPTIONS in your Angular module:

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

Step 2: Configure Default Options

In your Angular module, you can specify the default options like this:

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

This single line sets the appearance of all mat-input fields to outline, removing the need to specify it in each input's templateOptions.

Step 3: Instantiate Formly Form

Your form instantiation remains largely the same. Here’s how you would typically set up your formly form component:

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

Now, when you loop over your fieldsDescription array to generate inputs, every mat-input will automatically use the outline appearance.

Benefits of Using Default Options

Conciseness: Reduces repetition in code, making it cleaner and easier to maintain.

Consistency: Ensures that all inputs across the application have a uniform appearance.

Easier Updates: If you want to change the appearance later, you only need to update it in one place.

Conclusion

Setting default options for all inputs in your Angular Formly forms using MAT_FORM_FIELD_DEFAULT_OPTIONS is a simple yet powerful solution. It not only enhances the maintainability of your code but also aligns with best practices in Angular development. Say goodbye to repetitive configurations for each input and embrace a more streamlined approach to Angular Material input management.

With this knowledge, you can build cleaner and more consistent forms that provide a cohesive user experience throughout your Angular applications!