Angular 4 - creating input type dynamically with ngFor

Question

since I got a form with a lot of different input fields, to avoid having a gigantic html template I want to put the fields data inside objects and create the template dynamically using ngFor.
This is my code until now.

stub.ts - this is where I store my data

export const MY_DATA = [
  { placeholder: 'First name', name: 'name', model: 'model.name'},
  { placeholder: 'Last name', name: 'lastName', model: 'model.lastName'},
  { placeholder: 'Age', name: 'age', model: 'model.age'}
];

component.ts

import { Component, OnInit } from '@angular/core';
import {MY_DATA} from './stub';

@Component({
  selector: 'app-valutazione-insert',
  templateUrl: './valutazione-insert.component.html',
  styleUrls: ['./valutazione-insert.component.css']
})
export class ValutazioneInsertComponent implements OnInit {

  model: any = {};
  data = MY_DATA;

  constructor() { }

  ngOnInit() {}

  submit() {
      console.log('Data submitted: ', this.model);
    }

}

template.html

<div id="datiRichiesta" [hidden]="datiRichiestaClicked" >
        <div class="form-group" *ngFor="let d of data">
          <input type="text" class="form-control" placeholder="{{d.placeholder}}" [(ngModel)]=d.model name="{{d.name}}"
                onfocus="this.placeholder = ''" (blur)="this.placeholder = d.placeholder"/>
        </div>
      </div>

These are the input fields I got:

This is the rendered html code:

Now, I got some things that don't work:

even if on the rendered html all attributes are correctly set, the placeholder value takes the model value
the behaviour of the placeholder onfocus and onblur is not working
most important, if I try to submit some values these are not passed to the controller

Now every problem disappear if I use an input type with all properties set statically. Is there any way to achieve what I want?

Thanks!

taras-d · Accepted Answer · 2017-08-18 14:04:55Z

3

stubs.ts

It is better to renamed model to modelPropName to make it more clear.

This means First name will be set in the name property of the model: any = {} object, and so on.

export const MY_DATA = [
  { placeholder: 'First name', name: 'name', modelPropName: 'name'},
  { placeholder: 'Last name', name: 'lastName', modelPropName: 'lastName'},
  { placeholder: 'Age', name: 'age', modelPropName: 'age'}
];

template.html

<form id="datiRichiesta" [hidden]="datiRichiestaClicked" (submit)="submit()">
    <div class="form-group" *ngFor="let d of data">
        <input type="text" 
            class="form-control" 
            placeholder="{{d.placeholder}}" 
            [(ngModel)]="model[d.modelPropName]"
            name="{{d.name}}"
            (focus)="$event.target.placeholder = ''" 
            (blur)="$event.target.placeholder = d.placeholder"/>
    </div>
    <button>Submit</button>
</form>

When you submit the form you should in the console:

Data submitted: Object {name: "...", lastName: "...", age: "..."}

answered Aug 18, 2017 at 14:04

taras-d

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2 Comments

esseara Over a year ago

This is simple and perfect. Thank you.

Luis Ruiz Figueroa Over a year ago

I want to create one but my object has 2 levels {name: "...", lastName: "...", age: "...", 2level: {other: "...",other2:"..."}} Can be done?

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