To effectively manage the form, I must carefully monitor any modifications and update the SAVE button accordingly in an Angular application

Question

To effectively manage the form, I must carefully monitor any modifications and update the SAVE button accordingly in an Angular application

Are you experiencing an issue with detecting any changes on a page, where there is some information displayed and even if no changes are present, the SAVE button remains active for clicking?

ngOnInit(): void {
        this.createConfigForm()

        this.configFilterForm.valueChanges.pipe(takeUntil(this.unsubscribeAll$)).subscribe(value => {
            value
        })
 }

<!-- ADD BUTTON -->
            <button
                *ngIf="isUpdate()"
                [disabled]="configFilterForm"
                mat-raised-button
                class="add-config-button"
                (click)="onSave()"
                trackClickSnowplow
                id="config-form_save_button"
            >
                <span>SAVE</span>
            </button>

angular typescript subscription

Answer 1

Answer №1

Angular comes with this feature built-in. Simply add the form property: pristine or dirty to determine if any changes have been made on the form:

[disabled]="configFilterForm.pristine"

<button
   *ngIf="isUpdate()"
   [disabled]="configFilterForm.pristine"
   mat-raised-button
   class="add-config-button"
   (click)="onSave()"
   trackClickSnowplow
   id="config-form_save_button"
   >
    <span>SAVE</span>
   </button>

Answer 2

Angular comes with this feature built-in. Simply add the form property: pristine or dirty to determine if any changes have been made on the form:

[disabled]="configFilterForm.pristine"

<button
   *ngIf="isUpdate()"
   [disabled]="configFilterForm.pristine"
   mat-raised-button
   class="add-config-button"
   (click)="onSave()"
   trackClickSnowplow
   id="config-form_save_button"
   >
    <span>SAVE</span>
   </button>

Answer 3

Answer №2

Observe the form modifications as you are currently doing, and each time a change occurs, activate the button. Disable the button after it is clicked, and keep it disabled until another change occurs. Here's an example:

formFilter: FormGroup;
isButtonDisabled = true;

constructor(private fb: FormBuilder) {
  this.formFilter = this.fb.group({
    input1: ['hello']
  });

  this.formFilter.valueChanges.pipe(
    takeUntil(this.unsubscribeAll$)
  ).subscribe(value => {
     this.isButtonDisabled = false;
  });
}

Include the button like so:

<button [disabled]="isButtonDisabled">Submit</button>

CHECK OUT THE DEMO HERE

By the way, I noticed that you are using *ngIf="isUpdate()" on your button. It's advisable not to do that as they trigger on every change detection and can potentially slow down your application. Utilize variables instead!

Answer 4

Observe the form modifications as you are currently doing, and each time a change occurs, activate the button. Disable the button after it is clicked, and keep it disabled until another change occurs. Here's an example:

formFilter: FormGroup;
isButtonDisabled = true;

constructor(private fb: FormBuilder) {
  this.formFilter = this.fb.group({
    input1: ['hello']
  });

  this.formFilter.valueChanges.pipe(
    takeUntil(this.unsubscribeAll$)
  ).subscribe(value => {
     this.isButtonDisabled = false;
  });
}

Include the button like so:

<button [disabled]="isButtonDisabled">Submit</button>

CHECK OUT THE DEMO HERE

By the way, I noticed that you are using *ngIf="isUpdate()" on your button. It's advisable not to do that as they trigger on every change detection and can potentially slow down your application. Utilize variables instead!

Answer 5

Answer №3

To implement this in your HTML file;

<form [formGroup]="formAngular" (ngSubmit)="onSubmit()">
        <label>Enter Name</label>
        <input type="text" formControlName="name">

        {{formAngular.controls.name.errors | json}}

        <p 
            *ngIf="formAngular.controls.name.errors?.required && formAngular.controls.name.touched && formSend">
            Please provide your name
        </p>

    <input type="submit" value="Submit"  />

    <p  *ngIf="formSend && !formAngular.valid">Form is incomplete</p>

</form>

Incorporate the following code into your component TS file;

  formAngular: FormGroup;

  formSend: boolean;

  constructor() {
    this.formSend = false;
    this.formAngular = new FormGroup({
      name: new FormControl('', [
        Validators.required,
        Validators.maxLength(10)
      ])
  }

onSubmit() {
    this.formSend = true;
    console.log("Value of Form: ", this.formAngular.value);
  }


ngOnInit() {
    const controlName = this.formAngular.controls.name;
    controlName.valueChanges.pipe(debounceTime(500)).subscribe(value => {
      console.log("Your modifications: ", value);
    });
  }

Answer 6

To implement this in your HTML file;

<form [formGroup]="formAngular" (ngSubmit)="onSubmit()">
        <label>Enter Name</label>
        <input type="text" formControlName="name">

        {{formAngular.controls.name.errors | json}}

        <p 
            *ngIf="formAngular.controls.name.errors?.required && formAngular.controls.name.touched && formSend">
            Please provide your name
        </p>

    <input type="submit" value="Submit"  />

    <p  *ngIf="formSend && !formAngular.valid">Form is incomplete</p>

</form>

Incorporate the following code into your component TS file;

  formAngular: FormGroup;

  formSend: boolean;

  constructor() {
    this.formSend = false;
    this.formAngular = new FormGroup({
      name: new FormControl('', [
        Validators.required,
        Validators.maxLength(10)
      ])
  }

onSubmit() {
    this.formSend = true;
    console.log("Value of Form: ", this.formAngular.value);
  }


ngOnInit() {
    const controlName = this.formAngular.controls.name;
    controlName.valueChanges.pipe(debounceTime(500)).subscribe(value => {
      console.log("Your modifications: ", value);
    });
  }

To effectively manage the form, I must carefully monitor any modifications and update the SAVE button accordingly in an Angular application

Answer №1

Answer №2

Answer №3

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