How to resize Angular DropdownList popup based on viewport?

2 mins read

In the realm of responsive web application development, it’s crucial to ensure that UI components adapt seamlessly to varying screen sizes, thereby enhancing the user experience. One such component that often requires dynamic resizing is the Angular DropdownList popup. This guide will walk you through the process of dynamically adjusting the height of the DropdownList popup in response to changes in the viewport size.

Implementing Dynamic Popup Height Adjustment

The key to dynamically adjusting the height of the DropdownList popup lies in the judicious use of the popupHeight property, coupled with the window resize event. Here’s how you can incorporate this functionality into your Angular application:

Step 1: Module Importation

Initially, make sure to import the DropDownListComponent from the relevant package and the HostListener from @angular/core.

import { DropDownListComponent } from '@syncfusion/ej2-angular-dropdowns';
import { HostListener } from '@angular/core';

Step 2: Incorporating ViewChild and HostListener

Within your component, employ ViewChild to obtain a reference to the DropDownList component and HostListener to monitor window resize events.

export class AppComponent { 

  @ViewChild('sample')
  public listObj: DropDownListComponent;

  ngAfterViewInit(e: any): void {
    this.setPopupHeight();
  }

  @HostListener('window:resize', ['$event'])
  onResize() {
    this.setPopupHeight();
  }

  // ... Additional code
}

Step 3: Formulating the setPopupHeight Function

Devise a function that computes the optimal popup height based on the viewport height and assigns it to the DropDownList component.

private setPopupHeight() {
  // Compute viewport height
  const viewportHeight = window.innerHeight;

  // Tailor popup height to viewport height
  const popupHeight = Math.floor(viewportHeight * 0.4); // Modify this value as required

  // Dynamically assign the popupHeight
  if (this.listObj) {
    this.listObj.popupHeight = popupHeight + 'px';
    this.listObj.dataBind();
  }
}

Live Demonstration:

For an interactive exploration of the concept, consider visiting the following StackBlitz sample. This live example provides a hands-on experience of the Dynamic Popup Height Adjustment in action:

Live Sample - Dynamic Popup Height Adjustment

Conclusion

I hope you enjoyed learning about how to resize Angular DropdownList popup based on viewport.

You can refer to our Angular DropdownList feature tour page to know about its other groundbreaking feature representations and documentation, and how to quickly get started for configuration specifications. You can also explore our Angular DropdownList example to understand how to create and manipulate data.

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