How Can I Get <div> height in my .ts file

Question

I am using ionic tags to design my application and at one of my screen I want <div> tag's height and want to calculate next view height

Any Idea how to get <div> height at runtime in my .ts file?

Code:

 <div *ngIf="affectedItemsViewShowFlag" class="affected-items-list-style" [style.height.%]="height">
      <ion-list *ngSwitchCase="'affected item'" class="list-style">
        <ion-grid no-padding>
          <ion-row *ngFor="let keyValue of affectedItemJsonKeyValues">
            <ion-col col-6>
              <ion-item>
                <ion-label class="key-font-style">{{ keyValue }}</ion-label>
              </ion-item>
            </ion-col>
            <ion-col col-6>
              <ion-item class="column-remove-padding">
                <ion-label class="value-font-style">{{ faCaseDetails.affected_item[keyValue] }}</ion-label>
              </ion-item>
            </ion-col>
          </ion-row>
        </ion-grid>
      </ion-list>
    </div>

in above <div> my height dynamic like [style.height.%]="height" and I am fetching this from my ts file.

But before that, I want <div> height of the previous one segment.

any help appreciated!

Thanks in advance!

Answer 1

Even though var height = document.getElementById('myDiv').offsetHeight; would work, that's not the best way to access to the DOM in an Angular application.

Direct access to the DOM must be avoided when possible.

A better way to do that would be by using a template variable in the view:

<ion-header>
...
</ion-header>

<ion-content padding>    
  <div #target style="background-color:yellow; height:100px;"></div>    
  <p>The height of the div is: {{ result }}px</p>
</ion-content>

And then using ViewChild to get that element in the component code:

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

@Component({
  selector: 'page-home',
  templateUrl: 'home.html'
})
export class HomePage {

  @ViewChild('target') targetElement: any;    
  result: string;

  constructor() {}

  ngOnInit() {
    // Get the height of the element
    const height = this.targetElement.nativeElement.offsetHeight;

    // Here you can use the height!
    this.result = height;
    console.log(height);
  }

}

Please take a look at this working stackblitz demo.