I have a FormArray and need to iterate through each of its members.
I see there is a get method in the docs, but I don't see where to get the keys, or even the length.
How do I iterate a FormArray?
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4 Answers
You have a property controls in FormArray which is an array of AbstractControl objects. Check the specific documentation for FormArray and you will see they also inherit from AbstractControl like the FormControl you posted.
Be aware that in the controls array you can have again inside FormArray or FormGroup objects besides FormControl objects because there can be nested groups or arrays.
Here is simple example:
for (let control of formArray.controls) {
if (control instanceof FormControl) {
// is a FormControl
}
if (control instanceof FormGroup) {
// is a FormGroup
}
if (control instanceof FormArray) {
// is a FormArray
}
}
4 Comments
BBaysinger
I actually figured it out moments ago. Thanks for the additional info.
BBaysinger
Dunno why that's not documented.
G. Siganos
This SO answer helped me:
this.form = this.fb.group({ userIds: this.fb.array([]) }); const userIds = this.form.controls.userIds as FormArray; userIds.value.forEach(key => { this.clinet.updateContactGroup(key, this.groupId).subscribe();} );
Ousama
You can iterate through
formArray.controls, please see the answer belowI solved this problem by looping through formArray.controls :
formArray.controls.forEach((element, index) => {
...
});
Comments
If someone needs helps with iterating them in template (like I did), you can do this.
In this case we have FormArray where each child is FormControl
get myRows(): FormControl[] {
return (this.<your form group>.get('<field name>') as FormArray).controls as FormControl[];
}
And in template
*ngFor="let row of myRows"
So, I had same situation, in my case:
adjustmentAmountArray: FormArray;
And I need sum of contingencyUsed of every FormArray item.
adjustmentAmountArray.controls.reduce((acc, curr) => {
return acc + curr.value.contingencyUsed;
});
