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simple example of angular 4 validations - Tutorial

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To upgrade our form into an Angular form that can perform validation, we have to createFormControl andFormGroupobjects. A FormControl object represents a form control in a form. With it, we can track the value and validation status of an individual form control. AFormGroup object tracks the value and validity state of a group of FormControl objects.

Example

Step 1: Create new angular cli project.

Step2: Create new controller.

ng g c validationexample –flat

 



Step 3: Add following code into validationexample.component.html

 

Step4: Add following code into validation.component.ts

Step 5: Pass reference of newly created component(validationexample) to app.component.html

Step 6: Run application

ng serve –open

Output:

 

 

 



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