Prevent mat-select to trigger mouseleave event

Question

I have 2 mat-card components which contains a mat-select each. I track the mouse on which mat-card it currently is. Therefore I use 2 events:

• mouseenter - when the mouse is on the mat-card
• mouseleave - when it leaves the card

Those events triggers methods that will update the selected mat-card.

HTML:

<div fxLayout="column" fxLayoutGap="50px">

  <mat-card (mouseenter)="select('0')" (mouseleave)="unselectCards()">
    <h4>Basic mat-select</h4>
    <mat-form-field>
      <mat-label>Favorite food</mat-label>
      <mat-select>
        <mat-option *ngFor="let food of foods" [value]="food.value">
          {{food.viewValue}}
        </mat-option>
      </mat-select>
    </mat-form-field>
  </mat-card>
  <mat-card (mouseenter)="select('1')" (mouseleave)="unselectCards()">
    <h4>Basic mat-select</h4>
    <mat-form-field>
      <mat-label>Favorite food</mat-label>
      <mat-select>
        <mat-option *ngFor="let food of foods" [value]="food.value">
          {{food.viewValue}}
        </mat-option>
      </mat-select>
    </mat-form-field>
  </mat-card>

  <span>Selected: {{ selectedCard }}</span>
</div>

TS:

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

export interface Food {
  value: string;
  viewValue: string;
}

/**
 * @title Basic select
 */
@Component({
  selector: 'select-overview-example',
  templateUrl: 'select-overview-example.html',
  styleUrls: ['select-overview-example.css'],
})
export class SelectOverviewExample {
  selectedCard = '1';

  foods: Food[] = [
    {value: 'steak-0', viewValue: 'Steak'},
    {value: 'pizza-1', viewValue: 'Pizza'},
    {value: 'tacos-2', viewValue: 'Tacos'}
  ];

  select(card: string) {
    this.selectedCard = card;
  }

  unselectCards() {
    this.selectedCard = '';
  }
}

The key issue here is when I open the mat-select to select an option. This will trigger the mouseleave event which is not intended . Do you know how to prevent the triggering of the mouseleave event?

Short facts:

• selectedCard holds the value of the current card location of the mouse
• (mouseenter) selects the card
• (mouseleave) sets the value to an empty string
• mat-select triggers the (mouseleave) event what I don't want. It should stay on the same value as before. How can I solve this.

Thank you so far.

Demo: https://stackblitz.com/edit/angular-48t5yk

Answer 1

I suppose you can check if the mat-select is open or not like this and update the selection when the mat-select toggles:

<mat-card (mouseenter)="select('1')" (mouseleave)="!matSelect.panelOpen && unselectCards()">
  <h4>Basic mat-select</h4>
  <mat-form-field>
    <mat-label>Favorite food</mat-label>
    <mat-select #matSelect="matSelect" (openedChange)="$event ? select('1') : unselectCards()">
      <mat-option *ngFor="let food of foods" [value]="food.value">
        {{food.viewValue}}
      </mat-option>
    </mat-select>
  </mat-form-field>
</mat-card>

stack

Answer 2

I just had the same problem. Solved it by checking the target of the MouseEvent.

component.html

<div (mouseleave)="onMouseLeave($event)">your component</div>

component.ts

onMouseLeave(event: MouseEvent): void {
  if ((event.relatedTarget as HTMLInputElement).className !== 'mat-option-text') {
    // your action on leave
  }
}