Angular 4 Form Validators - minLength & maxLength does not work on field type number

Question

I am trying to develop a contact form, I want user to enter phone number values between length 10-12.

Notably same validation is working on Message

Answer 1

You should not use length here, for min and max use custom validator like this,

var numberControl = new FormControl("", CustomValidators.number({min: 10000000000, max: 999999999999 }))

Angular2 min/max validators

Answer 2

I have a trick that 100% work.

Define input of type 'text' and not 'number'.

For eg:

<input placeholder="OTP" formControlName="OtpUserInput" type="text">

Then use pattern which is part of Validation.

Like :

this.ValidOtpForm = this.formbuilder.group({
             OtpUserInput: new FormControl(
              { value:'', disabled: false },
          [
          Validators.required,
          **Validators.minLength(6),
          Validators.pattern('[0-9]*')**
        ]),
});

It means we define input type text that is suitable for min length and we also define pattern(validation) for numeric value so that we can achieve both validation.

Remaining code :

<mat-error *ngIf="RegistrationForm.controls['Password'].hasError('minlength')">Use 6 or more characters with a mix of letters</mat-error>
<mat-error *ngIf="ValidOtpForm.controls['OtpUserInput'].hasError('pattern')">Please enter numeric value.</mat-error>

Answer 3

If you want to validate a field by multiple validators then, You should try this

phone: ['', Validators.compose([
        Validators.required, 
        Validators.minLength(10),
        Validators.maxLength(12)])
      ])],

Answer 4

<div nz-col [nzXs]="24" [nzSm]="12" nz-form-control nzHasFeedback>
                                <nz-input formControlName="password" [nzPlaceHolder]="'password'" [nzType]="'password'" [nzSize]="'large'" (ngModelChange)="validateConfirmPassword()">
                                </nz-input>
                                <div nz-form-explain *ngIf="getFormControl('password').dirty&&getFormControl('password').hasError('minlength')">Your password must be at least 5 characters long. </div>
                                <div nz-form-explain *ngIf="getFormControl('password').dirty&&getFormControl('password').hasError('maxlength')">Your password cannot exceed 15 characters. </div>
                                <div nz-form-explain *ngIf="getFormControl('password').dirty&&getFormControl('password').hasError('required')">Please input your password!</div>
                            </div>

Answer 5

For a number field, you can validate min and max values using built in Angular validation, like this:

.ts

import { FormBuilder, FormGroup, Validators } from '@angular/forms';

private myNumberFieldMin: number = 1;
private myNumberFieldMax: number = 1000000;

constructor() {
      this.myForm = this.formBuilder.group({
        myNumberField
      })

this.myForm.controls.myNumberField.setValidators([
  Validators.min(this.myNumberFieldMin),
  Validators.max(this.myNumberFieldMax)
]);

html

<form [formGroup]="myForm">
  <input type="number" formControlName="myNumberField">

  <div *ngIf="this.myForm.controls['myNumberField'].errors && this.myForm.controls['myNumberField'].errors.min">
    <span class="error-message">Value must be at least {{myNumberFieldMin}}</span>
  </div>
  <div *ngIf="this.myForm.controls['myNumberField'].errors && this.myForm.controls['myNumberField'].errors.max">
    <span class="error-message">Maximum value is {{myNumberFieldMax}}</span>
  </div>
</form>

Answer 6

You can use a pattern instead to validate your phone number, and change your input type to text

<input type="text" formControlName="phone" placeholder="Phone Number">

and use this pattern for phone number tha have a length between 10 and 12

phonePattern = /^[0-9]{10,12}$/;

and change the validator on your form control

phone: ['',  [Validators.required, Validators.pattern(this.phonePattern)]],

and you can display the error:

<div *ngIf="myForm.get('phone').invalid">
      <div class="error-message invalid-feedback" *ngIf="myForm.get('phone').hasError('required')">
        required!
      </div>
      <div class="error-message invalid-feedback" *ngIf="myForm.get('phone').hasError('pattern')">
        invalid!
      </div>
</div>