I have a form using the reactive form approach. The form is created as follow in my pug:
form([formGroup]=\'form\', novalidate=\'\', (ngSubmit)=\'postSurvey(
Yes, that error message is a bit cryptic, but if you use FormBuilder, you would see this when you added a control to FormGroup in your component and named it "A", but then either forgot to add input with formControlName="A" to your template, or formControlName for the intended input is not A, or empty, or not present.
Basically, it says: "I cannot match the control I have in FormGroup to the control in the template".
to me it happened when I used same [formControl]="carBrand"
and [matAutocomplete]="carBrandAuto"
from my autocomplete input
I changed this
FROM:
...
<input
[formControl]="carBrand"
[matAutocomplete]="carBrand"
>
<mat-autocomplete matAutocomplete #carBrand="matAutocomplete">
...
TO
...
<input
[formControl]="carBrand"
[matAutocomplete]="carBrandAuto"
>
<mat-autocomplete matAutocomplete #carBrandAuto="matAutocomplete">
...
I came across looking for a solution to the similar issue and then found a solution myself. My issue was the following. I had a form like this
form: FormGroup = new FormGroup({
status: new FormArray([])
});
Initially it was represented by the list of checkboxes for each status on the template. And then I created a custom component to represent status
selector and used it in template like so
<status-selector [formControlName]="'status'"></status-selector>
The problem is that formControlName
must point to FormControl
instance, but actually it was pointing to a FormArray
instance. So, changing to status: new FormControl([])
fixed this issue for me.
Maybe you have moved a control element outside the group in the template.
OK:
<div formGroupName="passwordForm">
Password: <input type="password" formControlName="password">
Confirm: <input type="password" formControlName="confirmPassword">
</div>
Not OK:
Password: <input type="password" formControlName="password">
<div formGroupName="passwordForm">
Confirm: <input type="password" formControlName="confirmPassword">
</div>
In my case the error occurred when the formControl name was same as a template variable on the page. For example
<select id="status" [formControl]="userStatus">...</select>
<form-status #userStatus ></form-status> //matching template variable name
In my case this error was thrown because I was using FormControlName
instead of FormArrayName
to bind to a FormArray
in my template.
My component code:
public form = new FormGroup({
...
checkboxes: new FormArray([....])
})
My template code that threw error:
<input type="checkbox" formControlName="checkboxes" />
Fix:
<input type="checkbox" formArrayName="checkboxes" />