Angular2 Cannot read property 'nativeElement' of undefined

Question

I am trying to get datas from component in html,one upload image function is there.

but am getting   'nativeElement' of undefined error.what mistake i did?

 

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

 

 

public uploadImage(): void {

alert("file methode strike");

this.elem.nativeElement.querySelector('#spinner').style.visibility = 'visible';

let files = this.elem.nativeElement.querySelector('#selectFile').files;

let formData = new FormData();

let file = files[0];

formData.append('selectFile', file, file.name);

this._StartpageAdminservice.uploadImage(formData).subscribe(

res => this.dataLoaded(res));

console.log(this.dataLoaded);

 

private dataLoaded(data: any): void {

this.elem.nativeElement.querySelector('#spinner').style.visibility = 'hidden';

}

 

 

 

 html(which is inside a

tag)

 

Name :

Link Url :

Image Upload :

Publish Start Date :

Publish End Date :

Save