angular2 directives - Get the width, height and offset of clicked div - Angular 2

Question

I have a template that creates a list of links using *ngFor and a separate div element that I want to change its location based on the currently active link.

Template:

<div #divHandle
    *ngFor="let link of links; let i = index"
    class="div-link"
    (click)="changeActiveLink(i)">
    <h2>{{link}}</h2>
</div>
<div
[@indexState]="activeLink"
id="highlighter"></div>

This results in a structure like so:

<div class="div-link">
  <div (click)="changeActiveLink(0)"><h2>Link 1</h2></div>
  <div (click)="changeActiveLink(1)"><h2>Link 2</h2></div>
  <div (click)="changeActiveLink(2)"><h2>Longer link 1</h2></div>
  <div (click)="changeActiveLink(3)"><h2>Longer link 2</h2></div>
</div>
<div id="highlighter"></div>

I want my highlighter div to get the width of Link 1 when activeLink = 0. Similar to this plain js:

var High = document.getElementById('highlighter');
High.style.width = document.getElementsByClass('div-link')[0].children[activeLink].offsetWidth; //activeLink = 0

In my app.component.ts file:

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

@Directive({selector: '[class~=div-link]'})
@Directive({selector: '.div-link'}) // variant
@Directive({selector: '#divHandle'}) // variant
@Directive({selector: '[divHandle]'}) // variant
export class ChildDirective {
    constructor(elem: ElementRef){}
}

@Component({
    selector: 'my-app',
    ...
})
export class AppComponent implements AfterViewInit {
    @ViewChildren(ChildDirective) childrenContent: QueryList<ChildDirective>;

    ngAfterViewInit(){
        console.log(this.childrenContent);
    }
}

When I log the childrenContent I get a QueryList object, but it is empty, no elements to get info from.

I have tried several @Directive selectors and always my QueryList is empty.

Answer 1

You can use the $event property to handle the width, height, offset and so on. By using this method, a traditional javascript comes into play as below

HTML code will be as

<div *ngFor="let link of links;" class="div-link" 
             height="100px"
             width="30px"
             (click)="changeActiveLink($event)">
          <h2>{{link}}</h2>
</div>
<div height="height" width="width" id="highlighter">some text</div>

Handling the clicked element from above div element as

changeActiveLink(value){
    this.height=value.srcElement.parentElement.attributes['height'].value;
    this.width=value.srcElement.parentElement.attributes['width'].value;
    console.log(this.width);
    console.log(this.height); 
  }

Note: In the above example, the click event is on the letter so we will get the srcElement as h2 so I am using the parentElement. In real time you can handle it with either ways having a if condition inside the method.

You can also console.log the clicked element and get more idea to achieve this.

LIVE DEMO