Show/Hide Multiple Divs depend upon screen angular 2

Question

I want to use some buttons to show/hide multiple divs using angular2

The page will initially show all divs. when the small screen i hide all div and then separate buttons to show a particular div while hiding the rest.

Any help would be much appreciated.

<div class="buttons">
<a class="button" id="showdiv1">Div 1</a>
<a class="button" id="showdiv2">Div 2</a>
<a class="button" id="showdiv3">Div 3</a>
</div>


<div class="row">
  <div class="col-xlg-4 col-xl-5 col-lg-12 col-sm-12 col-xs-12 hidden-sm-down">
  </div>

   <div class="col-xlg-4 col-xl-5 col-lg-12 col-sm-12 col-xs-12 hidden-sm-down">
  </div>

   <div class="col-xlg-4 col-xl-5 col-lg-12 col-sm-12 col-xs-12 hidden-sm-down">
  </div>
</div>

Answer 1

Use @HostListener along with the resize event to determine the viewport's width. Then set assign a property with this value in your component which you can then supply to an ngIf* in your HTML template.

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

@Component()

export class AppComponent { 

  windowWidth: number = window.innerWidth;

  //initial values, The window object may still be undefined during this hook, let me know if that's the case and we'll figure out a better hook for the initial value
  ngAfterViewInit() {
      this.windowWidth = window.innerWidth;
  }

  //if screen size changes it'll update
  @HostListener('window:resize', ['$event'])
  resize(event) {
      this.windowWidth = window.innerWidth;
  }

}

<!-- Then any HTML element you wish to toggle apply the *ngIf directive as so: -->

<div *ngIf*="windowWidth > 800">content</div>