Reactive Forms in Angular: Dynamically Creating Form Fields and field Validation from JSON. Playing with table is always fun in Angular. Many times user want to add or update record in the table through user interactive/inline editable table with validation. To achieve this we can use Angular dynamic form controls.
So you have a table and would like to add form fields and validate them dynamically from a api responce(JSON)? It’s easy to do with Reactive Forms and FormArray. FormArray is a bit like FormGroup and it’s used in a very similar way, the difference being that it’s used as an array that wraps around an arbitrary amount of FormControl, FormGroup or even other FormArray instances.
Run ng serve for a dev server. Navigate to http://localhost:4200/. The app will automatically reload if you change any of the source files.
Run ng generate component component-name to generate a new component. You can also use ng generate directive|pipe|service|class|guard|interface|enum|module.
Run ng build to build the project. The build artifacts will be stored in the dist/ directory. Use the --prod flag for a production build.
Run ng test to execute the unit tests via Karma.
Run ng e2e to execute the end-to-end tests via Protractor.
To get more help on the Angular CLI use ng help or go check out the Angular CLI README.