Check angular form dirty state based on value

Check angular form dirty state based on value

By : Richard Feralwood
Date : November 15 2020, 06:54 AM
wish help you to fix your issue If there is no another solutions I have written the following directive which allow to to do it declarative way.
code :
angular.module('myApp').directive('trackValue', function() {
  return {
    require: 'ngModel',
    link: function(s, e, a, ngModelCtrl) {
      ngModelCtrl.$setOriginalValue = function(value) {
        ngModelCtrl.$originalValue = angular.copy(value);
      ngModelCtrl.$parsers.push(function(value) {
        if(angular.equals(value, ngModelCtrl.$originalValue)) {
        return value;

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Angular 5 Form dirty check

Angular 5 Form dirty check

By : Mohtisham Anwar Sala
Date : March 29 2020, 07:55 AM
I wish this help you Yes there is: I highly advise you to take a look at the documentation of reactive forms.
Apart from that, the built-in mechanism is only for checking the state of the form:
code :
// Creates a reference of your initial value
createReference(obj: any) {
  this.reference = Object.assign({}, obj);

// Returns true if the user has changed the value in the form
isDifferent(obj: any, prop: string) {
  return this.reference[prop] !== obj[prop];

submitForm(form: any) {
  // ... Business code ...
  hasChanges = false;
  for (let prop in form) {
    if (this.isDifferent(form, prop)) { hasChanges = true; }
  // If no changes, cancel form submition
  if (!hasChanges) { return; }
How do you change form state to dirty on button press within a form in Angular 4?

How do you change form state to dirty on button press within a form in Angular 4?

By : Dawood Ali
Date : March 29 2020, 07:55 AM
like below fixes the issue I have a form in Angular with a form array where you can add or delete data. Currently, during marking a form as dirty, it does not include button press for deletion. Is there a way to do this? Thank you! , Try like this:
code :
Angular - Check multiple Child components form as dirty

Angular - Check multiple Child components form as dirty

By : Lin Shearer
Date : March 29 2020, 07:55 AM
it should still fix some issue I have some bunch of child components holding a form - value for the form will be send from the parent components - i have looped the child components in the parent and passed the data to the components , use form element in your top level component
code :
<form #formType="ngForm">
    <ng-container *ngFor="let slot of slotRequests; let j = index;">
        <ng-container *ngIf="slot.ItemGrouping.toLowerCase() === 'mattress'">

                <div *ngFor="let data of slotRequests[j].Data; let i = index;">
                    <app-base-mattress [productSizes]="data.ItemDetails"></app-base-mattress>

import { Component, OnInit, ViewChild, Input } from '@angular/core';
import { NgForm, ControlContainer } from '@angular/forms'

  selector: 'app-base-mattress',
  templateUrl: './base-mattress.component.html',
  styleUrls: ['./base-mattress.component.css'],
  viewProviders: [{ provide: ControlContainer, useExisting: NgForm }]
export class BaseMattressComponent implements OnInit {
  @Input() productSizes: any[];

  constructor() { }

  ngOnInit() {

Angular reactive form - I want to get a form property and check if its dirty and pristine

Angular reactive form - I want to get a form property and check if its dirty and pristine

By : user2337424
Date : March 29 2020, 07:55 AM
I wish did fix the issue. When using a FormGroup you can access the children using the controls property. Which is a map.
code :
<p *ngIf="form.controls['address'].controls['addressLine1'].dirty">Error....</p>
Check box check state not changing at run time when form control value is changed in angular 8

Check box check state not changing at run time when form control value is changed in angular 8

By : MurphyJ
Date : March 29 2020, 07:55 AM
wish help you to fix your issue In your startTimer(), get rid of the square brackets in isActive: [i++ % 2 == 0], your interval should work fine with: isActive: i++ % 2 == 0 or isActive: (i++ % 2 == 0) if you want the brackets to make it more readable.
Also, if you also want to update the text box value when the checkbox is manually clicked, you can add change detection on the checkbox:
code :
 <input type="checkbox" formControlName="isActive" (change)="onCheckChange($event)"/>
    isActive: e.target.checked
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