What's the best way to streamline the code that sets up the list of validatees and validators in Angular's ReactiveFormsModule?

Question

What's the best way to streamline the code that sets up the list of validatees and validators in Angular's ReactiveFormsModule?

My form validation is currently based on ReactiveFormsModule, structured like this. Although I have multiple validators for each field, the process is quite repetitive.

constructor(private builder: FormBuilder) {
  this.form = builder.group({
    "firstName": ["", [Validators.required, Validators.minLength(3)]],
    "lastName": ["", [Validators.required, Validators.minLength(3)]]
  });
}

I find it unnecessarily lengthy and am curious if there's a more streamlined approach to consolidate all the validators into one single instance somehow.

forms angular validation typescript angular-forms

Answer 1

Answer №1

To simplify setting validators for fields with the same requirements, you can create an array of field names and reduce it to build your validation group:

const fields=["firstName","lastName"]
let myGroup = fields.reduce((group,field)=>{
  return group[field]=["",[Validators.required,Validators.minLength(3)]]
},{} as {[k:string]:any});

this.form = builder.group(myGroup);

If a field requires different validators, you can always update them later like this:

this.form.get("myField").setValidators([someValidator]);

However, keep in mind that this approach may sacrifice readability.

Answer 2

To simplify setting validators for fields with the same requirements, you can create an array of field names and reduce it to build your validation group:

const fields=["firstName","lastName"]
let myGroup = fields.reduce((group,field)=>{
  return group[field]=["",[Validators.required,Validators.minLength(3)]]
},{} as {[k:string]:any});

this.form = builder.group(myGroup);

If a field requires different validators, you can always update them later like this:

this.form.get("myField").setValidators([someValidator]);

However, keep in mind that this approach may sacrifice readability.

Answer 3

Answer №2

In my opinion, there are two aspects to consider when dealing with validation - the fields to be validated (vertical size) and the actual validations needed (horizontal size). While @n00dl3 explores both dimensions, I would recommend focusing solely on the horizontal aspect.

constructor(private builder: FormBuilder) {
  const validation = [Validators.required, Validators.minLength(3)];
  this.form = builder.group({
    "firstName": ["", validation],
    "lastName": ["", validation]
  });
}

Additionally, it seems likely that you will eventually need parameterized validations. In such a scenario, switching to a function that handles different types of validations might be more efficient.

constructor(private builder: FormBuilder) {
  this.form = builder.group({
    "firstName": ["", validation(1)],
    "lastName": ["", validation(2)]
  });
}

validation(type: number) : Validations {
  if(type === 1)
    return [Validations.required];
  return [Validators.required, Validators.minLength(3)];
}

Answer 4

In my opinion, there are two aspects to consider when dealing with validation - the fields to be validated (vertical size) and the actual validations needed (horizontal size). While @n00dl3 explores both dimensions, I would recommend focusing solely on the horizontal aspect.

constructor(private builder: FormBuilder) {
  const validation = [Validators.required, Validators.minLength(3)];
  this.form = builder.group({
    "firstName": ["", validation],
    "lastName": ["", validation]
  });
}

Additionally, it seems likely that you will eventually need parameterized validations. In such a scenario, switching to a function that handles different types of validations might be more efficient.

constructor(private builder: FormBuilder) {
  this.form = builder.group({
    "firstName": ["", validation(1)],
    "lastName": ["", validation(2)]
  });
}

validation(type: number) : Validations {
  if(type === 1)
    return [Validations.required];
  return [Validators.required, Validators.minLength(3)];
}

What's the best way to streamline the code that sets up the list of validatees and validators in Angular's ReactiveFormsModule?

Answer №1

Answer №2

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