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In this post, we will cover the following topics: The typical example of such type of nested forms is an address sub-form, and we are going to build one in this post. We will also learn in this guide how to create reusable nested forms, which are form sections that be reused in many different forms. The new custom form control will be fully compatible with the built-in Angular Forms Validators required, max as well as any other built-in or custom validators. The component will be part of a form and will be marked as in error in case that the counter does not match a valid range.
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We will be building in this guide a simple quantity selector component, that can be used to increment or decrement a value. and in the case of reactive forms, we will be able to add the custom component to the form using formControlName (or formControl).if we are using template driven forms, we will be able to plug the custom component to the form simply by using ngModel.In this guide, we are going to learn exactly how to take an existing custom form control component and make it fully compatible with the Angular Forms API, so that the component can participate in the parent form validation and value tracking mechanisms. to a form group.īesides these standard HTML elements, we might also want to use custom form controls, like dropdowns, selection boxes, toggle buttons, sliders, or many other types of commonly used custom form components.įor these custom controls, we would like to have the ability to configure them as form fields using the exact same directives ( ngModel, formControl,įormControlName) as we use for standard input boxes. The Angular Forms and ReactiveForms modules come with a series of built-in directives that make it very simple to bind standard HTML elements like inputs, checkboxes, text areas, etc.