select-field-line.component.html

<div class="row">
    <!-- titre -->
    <div class="col-3 select_title">
        {{_select.label}}
    </div>

    <!-- liste déroulante -->
    <div class="col-4 col-sm-3">
        <div class="btn-group" dropdown (click)="onSelect($event)">
            <button dropdownToggle class="btn grey darken-3 dropdown-toggle waves-light" type="button" mdbRippleRadius>
                {{currentLabel}}
            </button>
            <div class="dropdown-menu">
                <a class="dropdown-item" *ngFor="let e of entries" [value]=e.value>{{e.label}}</a>
            </div>
        </div>
    </div>
</div>