I have two components and one with attribute selector. The child component is,

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


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

    @Input() chartContainer: ElementRef;
    @Input() title: string;
    @Input() chartData: {
        title: string,
        content: {
            label: string,
            value: number,
            fill?: string
        }[]
    }[];

    constructor() { }

    ngOnInit() {
        console.log(this.chartContainer);
        console.log(this.chartContainer.nativeElement);
    }

}

The parent component is,

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

@Component({
    selector: 'app-dashboard',
    template: `<div><div class="graph-image" style="width: 100%; height: 400px;" app-bar-chart [title]="barChartTitle" [chartData]="ChartData" [chartContainer]="chartContainer" #chartContainer></div></div>`,
    styleUrls: ['./dashboard.component.css']
})
export class DashboardComponent implements OnInit {
    barChartTitle = 'Transaction History';
    ChartData = [
        {
            "title": "May2017",
            "content": [
                {
                    "label": "payable",
                    "value": 10
                }
            ]
        },
        {
            "title": "Jun2017",
            "content": [
                {
                    "label": "payable",
                    "value": 120
                }
            ]
        }
    ];
    constructor() { }

    ngOnInit() {
    }

}

I am passing the local reference from the parent component to the child component. When I am consoling the native element of this local reference it is 'undefined'. How can I access the native element so that I can access the style width and height of the component div.

If you need the ElementRef of a component, you can't use a template variable. If the element is a component, you'll get the component instance instead. A template variable only returns ElementRef for plain HTML elements.

To get ElementRef of a component, you need to use @ViewChild()

@ViewChild('chartContainer', { read: ElementRef }) myChartContainer:ElementRef;

and then pass it along with

[chartContainer]="myChartContainer"

I would make the input a setter

 private _chartContainer:ElementRef;
 @Input() 
 set chartContainer(value: ElementRef) {
   this._chartContainer = value;
   console.log(this.chartContainer);
   console.log(this.chartContainer.nativeElement);
 }

but ngOnInit works as well Plunker example

66 users liked answer #0dislike answer #066
Günter Zöchbauer profile pic
Günter Zöchbauer

The problem is that if you define a template reference on the element that Angular views as a host element of the component, you will get a reference to the component instance. Here:

<... chartContainer]="chartContainer" #chartContainer></div>

chartContainer will point to the instance of the BarChartComponent and that is why nativeElement is undefined.

To get elementRef of the host element, you don't need any bindings or lifecycle hooks, just inject the element into the constructor:

export class BarChartComponent implements OnInit {
   constructor(element: ElementRef) {
        console.log(element.nativeElement);
   }
44 users liked answer #1dislike answer #144
Max Koretskyi profile pic
Max Koretskyi

In the first selector you have set '[app-bar-chart]' and it should be without square brachets. To pass the parent you should use:

 [chartContainer]="this"

instead of:

 [chartContainer]="chartContainer"
0 users liked answer #2dislike answer #20
kimy82 profile pic
kimy82

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