How can display nested array data in form array in angular2? - json

Question

I have implemented FormGroup in angular2 project to render form and i have used formArray for getting nested array data
form.component.html
<div class="col-md-12" formArrayName="social_profiles">
<div *ngFor="let social of resumeForm.controls.social_profiles.controls; let i=index" class="panel panel-default m-t-10">
<div class="panel-heading" style="min-height: 30px;">
<span class="glyphicon glyphicon-remove pull-right" *ngIf="resumeForm.controls.social_profiles.controls.length > 1" (click)="removeSocialProfiles(i)"></span>
</div>
<div class="panel-body" [formGroupName]="i">
<social-profile [group]="resumeForm.controls.social_profiles.controls[i]"></social-profile>
</div>
</div>
</div>
form.component.ts
export class FormComponent implements OnInit {
public resumeForm: FormGroup;
constructor(private formBuilder: FormBuilder) {}
ngOnInit() {
this.resumeForm = this.formBuilder.group({
name: ['', Validators.required],
label: ['',],
email: [''],
phone: [''],
social_profiles: this.formBuilder.array([])
});
this.addSocialProfiles();
}
initSocialProfiles() {
return this.formBuilder.group({
network: [''],
url: ['']
});
}
addSocialProfiles() {
const control = <FormArray>this.resumeForm.controls['social_profiles'];
const addrCtrl = this.initSocialProfiles();
control.push(addrCtrl);
}
removeSocialProfiles(i: number) {
const control = <FormArray>this.resumeForm.controls['social_profiles'];
control.removeAt(i);
}
}
Where social-profile is child form for array
social-profile.component.html
<div [formGroup]="socialForm">
<div class="col-md-6">
<input type="text" class="form-control" placeholder="Enter Network" formControlName="network">
</div>
<div class="col-md-6">
<input type="text" class="form-control" placeholder="Enter Network URL" formControlName="url">
</div>
</div>
social-profile.component.ts
export class SocialProfileComponent {
#Input('group')
public socialForm: FormGroup;
}
Get JSON from Service callback
{
"basics_info": {
"name": "Joh Doe",
"label": "Programmer",
"Social_profiles": [{
"network": "Twitter",
"url": "https://www.twitter.com/kumarrishikesh12"
}, {
"network": "Facebook",
"url": "https://www.facebook.com/kumarrishikesh12"
}]
}
}
Add data Form working perfect but how can i display existing nested array of json (which is get from api) in form on edit time on page init ? Like below image

Answer 1

Here let's assume you have extracted the content from the object basics_info, i.e:
and assigned the JSON to a variable data, so that you end up with this content of data:
{
"name": "Joh Doe",
"label": "Programmer",
"Social_profiles": [{
"network": "Twitter",
"url": "https://www.twitter.com/kumarrishikesh12"
}, {
"network": "Facebook",
"url": "https://www.facebook.com/kumarrishikesh12"
}]
}
Then let's patch the values. You can patch the values after you have received the JSON (or build the form) after receiving data. Here I patch values after form has been built.
Below I like for clarification call another method inside patchValues, which actually sets the values.
patchValues() {
const control = <FormArray>this.resumeForm.controls['social_profiles'];
this.data.Social_profiles.forEach(x => { // iterate the array
control.push(this.patch(x.network, x.url)) // push values
});
}
patch(network, url) {
return this.fb.group({
network: [network],
url: [url]
});
}
The child should catch these changes just fine. Here's a demo for you, the variables are different, since I used an existing form I had. But the logic is absolutely the same.
Plunker