Challenges with formArrayName in Angular can be tricky to navigate

I am in the process of developing an Angular library with the main feature being the provision of a selector with two inputs:

  • a reactive form containing the data
  • an object literal specifying which properties of the data should have editable input fields

Subsequently, the library will automatically generate the corresponding HTML code.

Here's the issue: in a project where the library, let's call it tester, is being used, I have set up the reactive form to be passed into the library. The challenge arises when managing an array.

https://i.sstatic.net/TZ3A8.png

Within the library, I initially target the desired group using: 

[formGroup]="myForm.options.form.controls.allFriends"
(seems to be functioning correctly)

Then, I attempt to access the array using: 

[formArrayName]="myForm.options.form.controls.allFriends.controls.friends"
(this is where the error is encountered)

https://i.sstatic.net/fOr0O.png

Another aspect that appears peculiar is that a parent component already has 

[formGroup]="myForm.options.form"
. However, I am unable to use formGroupName alongside formGroup (as seen a few lines above) due to an error regarding the absence of a formGroup.

The situation may seem a bit intricate, so feel free to ask for further explanations if needed.

angulartypescriptangular-reactive-forms

Answer №1

According to the documentation, the formArrayName directive only requires the name of the formArray control, not the entire form-path leading to that control, as long as the parent form is properly defined in the template.

It appears that you are providing the entire formArray object to the directive here, 

[formArrayName]="expandedRowForm.options.form.controls.allFriends.controls.friends"
. Additionally, it is unclear what the expandedRowForm object is. In your successful assignment, you referenced the myForm object, 
[formGroup]="myForm.options.form.controls.allFriends"
.

Try checking if that information helps resolve the issue.

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