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Validation of input type number in Angular 6


Validation of input type number in Angular 6

By : amany
Date : October 18 2020, 06:10 AM
wish of those help You can use Angular Reactive Forms and add validators to your controls.
https://angular.io/guide/reactive-forms#simple-form-validation
code :
editForm = this.fb.group({
  myModeldata: ['', Validators.maxLength(10)],
});


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Strangeness with Angular validation of input type="number"

Strangeness with Angular validation of input type="number"


By : Ndek' Kun
Date : March 29 2020, 07:55 AM
I wish this help you This is bug. You can check it out in firefox. the $error of number should be true. Visit https://groups.google.com/forum/#!msg/angular/pRc5pu3bWQ0/4yxCdCz1JeMJ
How to customize a angular number input validation

How to customize a angular number input validation


By : user3532069
Date : March 29 2020, 07:55 AM
Hope that helps I am using a directive that validates number input boxes. I would like to change it to fit my needs. right now it allows me to enter numbers or text and throws the error message on button click. It also triggers the function. I would like it to instantly throw the error message when text is entered and I also would like to have the button disabled until both inputs are valid.
code :
app.directive('toNumber', function () {
return {
require: 'ngModel',
link: function (scope, elem, attrs, ctrl) {
    ctrl.$parsers.push(function (value) {
    $(elem).on('keyup',callback), 
        return parseFloat(value || '');
        $scope.apply()
    });
   }
};
Validation error in angular input[type=number]?

Validation error in angular input[type=number]?


By : user2234711
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , I have a strange problem when trying to validate input[type=number] in Angular 7 and hope that somebody can help. , Give this a try:
code :
<input 
  class="form-control" 
  type="number" 
  name="entranceFee"
  #entranceFee="ngModel"  
  [(ngModel)]="entranceFee.value"
  pattern="^[+]?([0-9]+(?:[\.][0-9]*)?|\.[0-9]+)$"
  [ngClass]="{ 'is-invalid': entranceFee.touched && entranceFee.invalid }" >

<div *ngIf="entranceFee.invalid && entranceFee.touched" class="invalid-feedback">
  <div *ngIf="entranceFee.errors.pattern">Only numbers are permitted</div>
  <div *ngIf="entranceFee.errors.min">Value cannot be smaller than '0'</div>
</div>
custom validation input type number angular 2

custom validation input type number angular 2


By : kwan
Date : March 29 2020, 07:55 AM
I hope this helps . Angular provide some Validators like required,maxLength.. but you can create your own Validator like this :
Create a fonction (this one take your control value, check if it's between 0 and 100. If it's okay, it returns null, which means no problems, otherwise you return an object with valid to false)
angular 7 input number validation

angular 7 input number validation


By : thelazy1
Date : October 14 2020, 01:00 PM
I think the issue was by ths following , You can fix this by adding Validators of Angular,
There is an existing one for Required: Angular Form Validation
code :
let numericRegex = /^[a-zA-Z0-9]+$/;
let myNumeric = new FormControl('', [
  Validators.required,
  Validators.pattern(numericRegex), // <-- Here's how you pass in the custom validator using regex.
]);
<input class="form-control"
      [formControl]="myNumeric" required >

  <div *ngIf="myNumeric.errors.required">
    value is required.
  </div>
  <div *ngIf="myNumeric.errors.pattern">
    only alphanumeric
  </div>
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