Angular 2: Iterate over reactive form controls

Question

I would like to markAsDirty all the controls inside of a FormGroup.

Answer 1

I create this function to make it* I have a control with name 'order', and pass index to him.

{"conditionGroups": [
   {
     "order": null,
     "conditions": []
   }
  ]
}


updateFormData() {
    const control = <FormArray>this.form.controls['conditionGroups'];  
    control.value.map((x,index)=>{
    x.order = index; 
 })

Answer 2

Seems that get function is not working anymore for retrieving specific values in your form in Angular 8, so this is how I solved it based on the answer of @Liviu Ilea.

for (const field in this.myForm.controls) { // 'field' is a string
  console.log(this.myForm.controls[field].value);
}

Answer 3

The accepted answer is correct for a flat form structure, but does not completely answer the original question. A web page may require nested FormGroups and FormArrays, and we must account for this to create a robust solution.

public markControlsDirty(group: FormGroup | FormArray): void {
    Object.keys(group.controls).forEach((key: string) => {
        const abstractControl = group.controls[key];

        if (abstractControl instanceof FormGroup || abstractControl instanceof FormArray) {
            this.markControlsDirty(abstractControl);
        } else {
            abstractControl.markAsDirty();
        }
    });
}

Answer 4

Using @Marcos answer I created a function that can be called passing a formGroup as parameter and it marks every formGroup children controls to dirty, just to make it usable from more places around the code putting it inside a service, for example.

public touchAllFormFields(formGroup: FormGroup): void {
    Object.keys(formGroup.controls).forEach((key) => {
        formGroup.get(key).markAsDirty();
    });
}

hope it helps ;)

Answer 5

Found out that Object.keys can handle this..

    Object.keys(this.form.controls).forEach(key => {
      this.form.get(key).markAsDirty();
    });

For Angular 8+, use the following (based on Michelangelo answer):

    Object.keys(this.form.controls).forEach(key => {
      this.form.controls[key].markAsDirty();
    });

Answer 6

For what it's worth, there's another way to do this without having to use Object.keys(...) magic:

for (const field in this.form.controls) { // 'field' is a string

  const control = this.form.get(field); // 'control' is a FormControl  

}