I'm new to Angular and tried to extend the example code from: Angular 4 Form FormArray Add a Button to add or delete a form input row
If a certain option was picked in a dropdown, new options for that option should be expressable. I got to this point without problems, but implementing the formControlName Tags for those 'lower-tier-options' are throwing me an error:
ContentComponent.html:56 ERROR Error: Cannot find control with path: 'inhalt -> 0 -> optionsKey'(…)
the exact line in the .html is: (input formControlName="optionsKey" )
I looked for those errors in other threads(Angular 2 Form "Cannot find control with path") or (Angular 2 Reactive Forms: Cannot find control with path) or (Error: Cannot find control with path: 'x ' angular 2), but their problems are based on creating ReactiveForm-Components without the FormBuilder. I created all my ReactiveForm-Components with the Formbuilder, which you will see in my code.
Did I maybe miss something or am doing it the wrong way?
content.html
<h3 class="page-header">Formular-Abschnitt hinzufügen</h3>
<button type="button" (click)="addNewFormControl()" class="btn btn-primary">Neues Formularelement</button><br>
<form [formGroup]="formContent">
<div>
<label>Bezeichnung des Abschnittes</label>
<input formControlName="absatz">
</div>
<div formArrayName="inhalt">
<!--
In the template we are iterating this formarray,
and that is just the path to the formarray, which is:
invoiceForm.controls.itemRows.controls
'invoiceForm' being the complete form object, 'controls' being the content of the form object,
'itemRows' being the (form)array in the form, 'controls' being the content of the formarray.
-->
<div *ngFor="let itemrow of formContent.controls.inhalt.controls; let i=index" [formGroupName]="i">
<h4>Formular-Element #{{ i + 1 }}</h4>
<div class="form-group">
<label>Element-Name</label>
<input formControlName="label" class="form-control">
</div>
<div class="form-group">
<label>Element-Key</label>
<input formControlName="key" class="form-control">
</div>
<div class="form-group">
<label>Element-zwingend notwendig?</label>
<input type="checkbox" formControlName="required" class="form-control">
</div>
<div class="form-group">
<label>Element-Position</label>
<input formControlName="order" class="form-control">
</div>
<div class="form-group">
<label>Element-Art</label>
<select formControlName="controlType" class="form-control">
<option>InputField</option>
<option>Checkbox</option>
<option>Radiobutton</option>
<option>Dropdown</option>
<option>Beschreibungstext</option>
</select>
<div [ngSwitch]="formContent.value.inhalt[i].controlType">
<div *ngSwitchCase="'Checkbox'">
<h3>Optionen definieren:</h3>
<button (click)="addFormControlOptions()">Neue Option hinzufügen</button>
<div *ngFor="let test of itemrow.controls.options.controls; let x = index" >
{{test.controls.optionsKey.value}}
<div>
<label >Key: </label>
<input formControlName="optionsKey" >
</div>
<div>
<label>Value: </label>
<input>
</div>
<button (click)="deleteFormControlOptions(x)">Option entfernen</button>
</div>
</div>
<div *ngSwitchCase="''">
<p>lololololo</p>
</div>
<div *ngSwitchDefault="">
<p>DEFAULT</p>
</div>
</div>
</div>
<button *ngIf="formContent.controls.inhalt.controls.length > 1" (click)="deleteFormControl(i)"
class="btn btn-danger">Delete Button
</button>
</div>
</div>
</form>
<!--<pre>{{formContent.value | json}}</pre>-->
<button type="submit" (click)="saveData()">Formular-Abschnitt speichern</button>
content.ts
import { Component, OnInit } from '@angular/core';
import {Form, FormArray, FormBuilder, FormGroup} from '@angular/forms';
import {isBoolean, isNumber} from 'util';
@Component({
selector: 'app-content',
templateUrl: './content.component.html',
styleUrls: ['./content.component.css']
})
export class ContentComponent implements OnInit {
public formContent: FormGroup;
absatz;
constructor(private _fb: FormBuilder) { }
ngOnInit() {
this.formContent = this._fb.group({
absatz: '',
inhalt: this._fb.array([this.initFormElements()])
});
}
initFormElements() {
return this._fb.group({
label: '',
key: '',
order: isNumber(),
controlType: '',
required: isBoolean(),
options: this._fb.array([this.initFormElementOptions()])
});
}
initFormElementOptions() {
return this._fb.group({
optionsKey: '',
optionsValue: ''}
);
}
addNewFormControl() {
const control = <FormArray>this.formContent.controls['inhalt'];
control.push(this.initFormElements());
}
deleteFormControl(index: number) {
const control = <FormArray>this.formContent.controls['inhalt'];
control.removeAt(index);
}
saveData() {
return this.formContent.value;
}
addFormControlOptions() {
// const control = <FormArray>this.formContent.controls['inhalt'].controls[0].options;
// control.push(this.initFormElementOptions());
}
deleteFormControlOptions(index: number) {
const control = <FormArray>this.formContent.controls['inhalt'].value[0].options;
control.removeAt(index);
}
}
Plunker: https://embed.plnkr.co/LIcp9vpGDCAWH9qZacQT/
Thanks in advance!
Update: I needed to add a formArrayName="options" to my SwitchCase and a formGroupName="x"(where I used the index x of the ngFor) for the ngFor-Div.
