The issue I encountered with Angular's Mat-Select component is that the openedChange

When a user opens the mat-select, I am attempting to set CSS style using custom code. However, I am encountering an undefined error. Upon checking in the console, I noticed that the panel value is returning undefined. Can someone please advise me on how to retrieve the panel value?

Error: Cannot read property 'nativeElement' of undefined

Html:

<mat-select #select (openedChange)="changeHeight($event,select)">
    <mat-option>1</mat-option>
    <mat-option>2</mat-option>
</mat-select>

component.ts:

import { Component, OnInit, Inject, Renderer2, ElementRef } from '@angular/core';

constructor(private renderer:Renderer2){}

changeHeight(event:any,element:any)
{
    if (event)
    {

      const height = window.innerHeight|| 
                     document.documentElement.clientHeight|| 
                     document.body.clientHeight;

      this.renderer.setStyle(element.panel.nativeElement,
          'max-height',
           (height-10-element.panel.nativeElement.getBoundingClientRect().y)+'px')
     }
}

Answer №1

Include the following code snippet:

import { ViewChild } from "@angular/core";
import { MatSelect } from "@angular/material/select";

Insert this in your component:

@ViewChild('select') select: MatSelect;

Once done, you can either pass select as a parameter if needed or directly call it without any parameters.

Answer №2

Assign an element reference to the top element within the constructor, then use the same name in your template #name referencing the elementref name.

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