How to push array of string in formArray?

Question

I need to create this:

instructions: ['value one' , 'value two' , 'value three'];

I am using formArray and check my code on stackblitz first: https://stackblitz.com/edit/formarray-obj?file=app/app.component.ts

html:

<div class="form">
    <form id="form" [formGroup]="filmForm" (ngSubmit)="save()">
        <button type="button" (click)="addItem()"> add new row</button>
        <div formArrayName="instructions" *ngFor="let a of filmForm.get('instructions').controls; let i = index">
            <div [formGroupName]="i" style="margin-bottom: 10px;">
                <label for="name">Name:</label>
                <input type="text" name="name" formControlName="instructions">
                <br><br>
            </div>
        </div>
        <div class="submit">
            <button type="submit">Save</button>
        </div>
    </form>
</div>

TS:

registerForm: FormGroup;
submitted = false;
instructions: FormArray;
filmForm: FormGroup;
constructor(private formBuilder: FormBuilder) { }

ngOnInit() {
    this.filmForm = this.formBuilder.group({
        instructions: this.formBuilder.array([this.createItem()])
    })
}

createItem() {
    return this.formBuilder.group({
        instructions: ['']
    })
}

addItem() {
    this.instructions = this.filmForm.get('instructions') as FormArray;
    this.instructions.push(this.createItem());
}

save() {
    console.log(this.filmForm.value)
}

I am sending array of object: check stackblitz console.log I am send like

instructors = [{instructs : 'value one'} , {instructs : 'value one'}..]

But I need to sent:

 instructors = ["value one" , "value two"];

You can use rxjs to format your data: console.log({ instructions: this.filmForm.value.instructions.map(e=> e.instructions) });. have a look on my stackblitz: stackblitz.com/edit/formarray-obj-kkszod — Ben
– Ben, Commented Jun 16, 2020 at 11:37

Community · Accepted Answer · 2020-06-20 09:12:55Z

0

There are two ways in which you go ahead with this.

1 - Using .map in save()

For the desired output, you can use the .map in save() function:

save() {
  const instructions = this.filmForm.value.instructions.map(inst => inst. instruction);

  console.log(instructions);
}

Desired Output will be:

["value one" , "value two"]

2 - Using a tags input control like ng-select

Your use case looks like a tags control use case for instructions. There is a popular library @ng-select/ng-select which has a tags control.

You can see the usage of this library for your use case on this stackblitz.

Approach 1 is the easiest one to do but I would suggest you use tags control in approach 2 for good user experience.

edited Jun 20, 2020 at 9:12

CommunityBot

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answered Jun 16, 2020 at 12:32

Harish

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2 Comments

Marrti Over a year ago

Ok I got this value...but how to append to my form...this values....

Harish Over a year ago

Could you explain what are you trying to do with the values? And also, which approach are you following?

Ikkyy · Accepted Answer · 2020-06-16 15:23:35Z

0

You can try this.. i had the same issue.

Make the Form

form = new FormGroup({
instructorsArray: new FormArray([]),
})

  get instructors(): FormGroup {
    return FormControl('')
  }

 addInstructors() {
    this.instructors.push(this.instructors);
  }

edited Jun 16, 2020 at 15:23

answered Jun 16, 2020 at 11:52

Ikkyy

6614 bronze badges

3 Comments

Marrti Over a year ago

What is this.pegadio??

Ikkyy Over a year ago

sorry, this.instructors.push(this.instructors);

Ikkyy Over a year ago

made a change to better understand.

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How to push array of string in formArray?

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