Angular 5 Insert dynamic input attributes

Question

I want to insert dynamically attributes to an input html tag, but I don\'t know to to do this:

I\'ve got this code from component side:

import { Componen         


        

Answer 1

I've just solved it using this

import { Component, Renderer2, ElementRef, OnInit } from '@angular/core';

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

  elements: any;

  constructor(private renderer: Renderer2, private el: ElementRef) { }

  ngOnInit() {
    this.elements = {};
    this.elements.name = 'TEST1';
    this.elements.type = 'text';
    this.elements.value = '12';
    this.elements.placeholder = 'PRUEBA';
    this.elements.maxlength = '10';

    const div = this.renderer.createElement('input');

    for (const el in this.elements) {
      if (this.elements.hasOwnProperty(el)) {
        this.renderer.setAttribute(div, el, this.elements[el]);
      }
    }
    this.renderer.appendChild(this.el.nativeElement, div);
  }

}

Thanks for all @nikolaus and @gab

Answer 2

If you want to dynamically change the attributes of a single <input> tag, I would recommend you use @ViewChild. For example,

import { Component, AfterViewInit, ElementRef } from '@angular/core';

@Component({
  selector: 'app-transclusion',
  template: `
    <input #foobar/>
    `,
  styleUrls: ['./transclusion.component.css']
})
export class TransclusionComponent implements AfterViewInit {

  @ViewChild('foobar') foobar: ElementRef;

  constructor() { }

  ngAfterViewInit() {
    this.foobar.nativeElement.value = 'foobar';
    // change other values of element
  }
}

Answer 3

You are following the wrong approach if you want to use attributes to "config" your input field you should use directives instad of a component...
and if you need to modify the native element on which you are appling your directive use the renderer service shipped with angular