Tips for customizing the appearance of Angular Material select drop down overlay

In my project, there is an angular component named currency-selector with its dedicated css file defining the styling as shown below:

.currency-select {
    position: absolute;
    top: 5px;
    right: 80px;
    z-index: 1000000;
    color: #DD642A;
    font-size: 17px;
    padding-right: 16px;
    width: 130px;
}

.mat-form-field {
    display: block;
}

While the styling works perfectly for the selector initially, an issue arises when the dropdown menu is clicked. The structure of the associated HTML code is as follows:

<div class="currency-select">
  <mat-form-field *ngIf=loaded>
    <mat-select [formControl]="currencyForm" placeholder="Select Currency">
      <select-search (search)="filterCurrencyOptions($event)" #selectSearch (keydown)="$event.stopPropagation()" >
      </select-search>
      <mat-option *ngFor="let currency of filteredCurrencies" [value]="currency.counter_currency_code" (click)="updateCurrency()">
          <flag-icon country="{{ (currency.counter_currency_iso_2 || '').toLowerCase() }}"></flag-icon>  {{currency.counter_currency_code}}
      </mat-option>
    </mat-select>
  </mat-form-field>
</div>

The problem occurs when clicking on the currency select and finding that the appearance of the dropdown doesn't match expectations. Despite attempting to modify the css within the currency-select.component.html file and using !important, it appears that the styling takes precedence from another div tag called "cdk-overlay-container."

I am seeking guidance on how to properly format the css in the currency-select css file to resolve this issue. Any suggestions or insights would be greatly appreciated.

Answer №1

If you want to customize the appearance of a select dropdown overlay, you can simply add a class to it using the mat-select input property panelClass.

<mat-select panelClass="myPanel">

After adding the class, you can style it using the ::ng-deep selector like this:

::ng-deep .myPanel.mat-select-panel {
  background-color: darkslategray;
}

Alternatively, if you prefer not to use ::ng-deep, you can disable ViewEncapsulation for the component by updating your component metadata:

@Component({
  selector: 'select-panel-class-example',
  templateUrl: 'select-panel-class-example.html',
  styleUrls: ['select-panel-class-example.css'],
  encapsulation: ViewEncapsulation.None,
})
.myPanel.mat-select-panel {
  background-color: darkslategray;
}

You can see a live example in action here: https://stackblitz.com/edit/angular-k4pxc1

Answer №2

Consider utilizing the ng-deep method:

::ng-deep .your-class-name {
  ...
}

Note: ng-deep is expected to be phased out in upcoming versions. The W3C has not yet specified a direct replacement for it.

Update (07-07-2021): If you prefer not to use the deprecated ng-deep, you can opt for ViewEncapsulation.None instead: angular.io/guide/component-styles#deprecated-deep--and-ng-deep

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