Exploring Angular 10's advanced forms: delving into three levels of nested form groups combined with

Question

Exploring Angular 10's advanced forms: delving into three levels of nested form groups combined with

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In my testForm, I have 3 levels of formGroup, with the last formGroup being an array of formGroups.

I am trying to enable the price field when a checkbox is clicked.

I am unsure how to access the price control from the array within this form group.

I am aware that I can disable it using [attr.disable]="variable", but I am concerned if this is mixing TemplateDrivenForm with ReactiveForm. If there is no other way to disable it using ReactiveForm methods, I will consider this approach.

Any guidance or suggestions would be greatly appreciated. Thank you!

javascript angular typescript

Answer 1

Answer №1

Utilize the method called "get". Notice how you can use dots to concatenate and access the control, as well as the usage of the index "i". This example may provide insight into why we utilize [formGroupName]="i" in .html files.

checkboxChange(event, i){
    const enabled: boolean = this.testForm.get('price.rentPeriods.' + i + '.checked').value;
    const control = this.testForm.get('price.rentPeriods.' + i + '.price');
    if (enabled) {
        control.enable();
    } else {
        control.disable();
    }
}

Answer 2

Utilize the method called "get". Notice how you can use dots to concatenate and access the control, as well as the usage of the index "i". This example may provide insight into why we utilize [formGroupName]="i" in .html files.

checkboxChange(event, i){
    const enabled: boolean = this.testForm.get('price.rentPeriods.' + i + '.checked').value;
    const control = this.testForm.get('price.rentPeriods.' + i + '.price');
    if (enabled) {
        control.enable();
    } else {
        control.disable();
    }
}

Answer 3

Answer №2

If you want to access the inner form array, you can create a getter for the form group first and then retrieve the array like this:

get InnerFormGroup(){ return this.myForm.controls.details as FormGroup; }
get InnerFormArray(){ return this.InnerFormGroup.controls.items as FormArray; }

This allows you to easily work with the array controls in any part of your component:

onItemSelect(){
    this.InnerFormArray.controls; // Access the array controls here to modify them
}

Answer 4

If you want to access the inner form array, you can create a getter for the form group first and then retrieve the array like this:

get InnerFormGroup(){ return this.myForm.controls.details as FormGroup; }
get InnerFormArray(){ return this.InnerFormGroup.controls.items as FormArray; }

This allows you to easily work with the array controls in any part of your component:

onItemSelect(){
    this.InnerFormArray.controls; // Access the array controls here to modify them
}

Exploring Angular 10's advanced forms: delving into three levels of nested form groups combined with

Answer №1

Answer №2

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