Limiting Users to Select Up to 5 Options in Angular Material Design's <mat-select multiple> Feature

Is it possible to limit the user to selecting only up to 5 options in a <mat-select multiple>? How can I achieve this?

I tried using the selectionChange event, but I couldn't find a way to visually prevent the user from selecting more than 5 options.

<mat-select [(ngModel)]="orderSearchModel.analystId" name="analyst" (selectionChange)="onChangeAnalyst($event)" multiple>
    <mat-option (click)="clearAnalyst()">clear</mat-option>
    <mat-option *ngFor="let user of users" [value]="user.value">{{user.name}}</mat-option>
</mat-select>

I want to restrict the user from selecting more than 5 options in my multi-select.

Answer №1

To simplify things, assuming that your

[(ngModel)]="orderSearchModel.analystId"
represents an array of selected elements - which is the case if you are using multiple. Make sure to update the naming to plural for clarity, changing from
orderSearchModel.analystId > orderSearchModel.analystIds
.

You can include the [disabled] property in the second <mat-option>, and if you are not utilizing selectionChange() elsewhere, consider removing it.

[disabled]="orderSearchModel?.analystId.length >= 5 && !orderSearchModel.analystId.includes(user.value)"

The initial check assesses the number of currently selected elements.

The following check ensures that only unselected elements are disabled.

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