Angular 2 Cannot find control with unspecified name attribute on formArrays
LoopsAngularAngular2 FormsLoops Problem Overview
I am trying to iterate over a formArray in my component but I get the following error
Error: Cannot find control with unspecified name attribute
Here is what the logic looks like on my class file
export class AreasFormComponent implements OnInit {
public initialState: any;
public areasForm: FormGroup;
constructor(private fb: FormBuilder) { }
private area(): any {
return this.fb.group({
name: ['', [Validators.required]],
latLong: ['', [Validators.required]],
details: ['', [Validators.required]]
});
}
public ngOnInit(): void {
this.areasForm = this.fb.group({
name: ['', [Validators.required]],
areas: this.fb.array([this.area()])
});
}
}
and my template file
<form class="areas-form" [formGroup]="areasForm" (ngSubmit)="onSubmit(areasForm.values)">
<md-input-container class="full-width">
<input mdInput placeholder="Location Name" type="text" formControlName="name" required>
<md-error *ngIf="areasForm.get('name').hasError('required')">Please enter the locationName</md-error>
</md-input-container>
<md-grid-list cols="1" [formArrayName]="areas">
<md-grid-tile formGroupName="i" colspan="1" rowHeight="62px" *ngFor="let area of areasForm.controls.areas.controls; let i = index ">
<md-grid-list cols="3" rowHeight="60px">
<md-grid-tile colspan="1">
<md-input-container class="full-width">
<input mdInput placeholder="Area Name" type="text" formControlName="name" required>
<md-error *ngIf="areasForm.get('areas').controls[i].name.hasError('required')">Please enter the area name</md-error>
</md-input-container>
</md-grid-tile>
<md-grid-tile colspan="1">
<md-input-container class="full-width">
<input mdInput placeholder="details" type="text" formControlName="details" required>
<md-error *ngIf="areasForm.get('areas').controls[i].name.hasError('required')">Please enter the locationName</md-error>
</md-input-container>
</md-grid-tile>
<md-grid-tile colspan="1">
<button md-fab (click)="remove(i)"><md-icon>subtract</md-icon>Remove Area</button>
</md-grid-tile>
</md-grid-list>
</md-grid-tile>
</md-grid-list>
<button type="submit" [disabled]="areasForm.invalid" md-raised-button color="primary">Submit</button>
</form>
Loops Solutions
Solution 1 - Loops
Remove the brackets from
[formArrayName]="areas"
and use only
formArrayName="areas"
This, because with [ ]
you are trying to bind a variable, which this is not. Also notice your submit, it should be:
(ngSubmit)="onSubmit(areasForm.value)"
instead of areasForm.values
.
Solution 2 - Loops
In my case I solved the issue by putting the name of the formControl in double and sinlge quotes so that it is interpreted as a string:
[formControlName]="'familyName'"
similar to below:
formControlName="familyName"
Solution 3 - Loops
The problem for me was that I had
[formControlName]=""
Instead of
formControlName=""
Solution 4 - Loops
Instead of
formGroupName="i"
You must use:
[formGroupName]="i"
Tips:
Since you're looping over the controls, you've already the variable area
, so you can replace this:
*ngIf="areasForm.get('areas').controls[i].name.hasError('required')"
by:
*ngIf="area.hasError('required', 'name')"
Solution 5 - Loops
For me, I was trying to add [formGroupName]="i"
and/or formControlName
and forgetting to specify the parent formArrayName
. Pay attention to your form group tree.
Solution 6 - Loops
This was happening for me because I had fromArrayName
instead of formArrayName
somewhere
Solution 7 - Loops
So, I had this code:
<div class="dropdown-select-wrapper" *ngIf="contentData">
<button mat-stroked-button [disableRipple]="true" class="mat-button" (click)="openSelect()" [ngClass]="{'only-icon': !contentData?.buttonText?.length}">
<i *ngIf="contentData.iconClassInfo" class="dropdown-icon {{contentData.iconClassInfo.name}}"></i>
<span class="button-text" *ngIf="contentData.buttonText">{{contentData.buttonText}}</span>
</button>
<mat-select class="small-dropdown-select" [formControl]="theFormControl" #buttonSelect (selectionChange)="onSelect(buttonSelect.selected)" (click)="$event.stopPropagation();">
<mat-option *ngFor="let option of options" [ngClass]="{'selected-option': buttonSelect.selected?.value === option[contentData.optionsStructure.valName]}" [disabled]="buttonSelect.selected?.value === option[contentData.optionsStructure.valName] && contentData.optionSelectedWillDisable" [value]="option[contentData.optionsStructure.valName]">
{{option[contentData.optionsStructure.keyName]}}
</mat-option>
</mat-select>
</div>
Here I was using standalone formControl, and I was getting the error we are talking about, which made no sense for me, since I wasn't working with formgroups or formarrays... it only disappeared when I added the *ngIf to the select it self, so is not being used before it actually exists. That's what solved the issue in my case.
<mat-select class="small-dropdown-select" [formControl]="theFormControl" #buttonSelect (selectionChange)="onSelect(buttonSelect.selected)" (click)="$event.stopPropagation();" *ngIf="theFormControl">
<mat-option *ngFor="let option of options" [ngClass]="{'selected-option': buttonSelect.selected?.value === option[contentData.optionsStructure.valName]}" [disabled]="buttonSelect.selected?.value === option[contentData.optionsStructure.valName] && contentData.optionSelectedWillDisable" [value]="option[contentData.optionsStructure.valName]">
{{option[contentData.optionsStructure.keyName]}}
</mat-option>
</mat-select>
Solution 8 - Loops
This happened to me because I left a formControlName empty (formControlName=""
). Since I didn't need that extra form control, I deleted it and the error was resolved.
Solution 9 - Loops
Only WinMerge made me find it (by comparison with a version that works). I had a case problem on formGroupName. Brackets around this word can lead to the same problem.
Solution 10 - Loops
I had accidentally entered the control name when creating the formGroup:
getFormGroup(dataItem: any): FormGroup {
return new FormGroup({
'Id': new FormControl(dataItem != null ? dataItem.Id : ''),
'PsDepartmentId': new FormControl(dataItem != null ? dataItem.DepartmentId : '', Validators.required), //Accidentally used 'DepartmentId' on this line
'IsActive': new FormControl(dataItem != null ? dataItem.IsActive : true)
});
}
Then it failed in the html when I did
<kendo-dropdownlist id="ps-dpts-dropdown" [data]="psDepartments" textField="ConCatedName" valueField="Id"
[formControl]="formGroup.get('DepartmentId')" [valuePrimitive]="true">
</kendo-dropdownlist>
Solution 11 - Loops
For me, the issue was I was missing the field name in the form builder:
return this.fb.group({
name: ['', [Validators.required]],
latLong: ['', [Validators.required]],
details: ['', [Validators.required]],
// missing field name!
});