The validators in the FormControl are inconsistently functioning, showing up where they shouldn't and sometimes failing to work where

I am currently developing a dynamic form in Angular that allows users to request any number of parts, generating rows of input fields for each part.

Each part has specific required fields, some of which should only accept numbers. I have implemented validators for these requirements, but regardless of the input, the fields do not display as invalid. Interestingly, I have other validators outside of the parts section that function correctly and display error messages when inputs are left empty.

Conversely, there is an optional "Notes" field without any validators that is behaving as if it has Validators.required applied, marking it as invalid when left blank.

I'm struggling to identify the root cause of these issues. Despite my attempts to find a solution, I have been unsuccessful so far.

Here is a snapshot of the program running, showcasing how an empty "Notes" input is deemed invalid and an entry with letters in the "Quantity" field is not marked invalid.

create.component.html

<h1>New Request</h1>

// Rest of the HTML code...

create.component.ts

// TypeScript code for component...

interface.ts (PurReqPart)

// Interface definition for PurReqPart object...
angulartypescriptangular-reactive-forms

Answer №1

James, I'm sorry to say that formBuilder methods do not "destructure" the arguments, so you cannot do

//this does NOT work
const obj=['',[Validators.maxLength(10)]]
this.control=this.formBuilder.control(obj)

Therefore, you cannot achieve what you desire. You can create a function like this instead:

getPurReqPart(data:any=null)
{
   data=data || {quantity:0,unit:''...}
   return formBuilder.group({
      quantity:[data.quantity,[Validators.required,Validators.pattern(this.numbersOnlyRegEx)],
      ...
   })
}

However, this cannot be done within an interface. Angular does not have something akin to DataAnotations in ASP.NET -I see that you may be attempting something similar-

Answer №2

Please explain how your addRow() function works and make sure to include any validators you are using.

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