import { OnInit } from '@angular/core';
import { QuestionBase } from '../../domain/question.base';
import { ScrollService } from '../scroll.service';
import { ListQuestionComponent } from "../list-question.component";
import { ApiService } from "../api.service";
import { Datasource } from "../../domain/datasource";
export declare class DropdownQuestionComponent extends ListQuestionComponent implements OnInit {
    private scrollService;
    protected apiService: ApiService;
    form: any;
    question: QuestionBase<any>;
    input: any;
    type: string;
    initialised: boolean;
    /**
     * The original options which may need to be used as a base
     * to filter if this question is subscribed to the value of another question.
     */
    currentFilter: any[];
    constructor(scrollService: ScrollService, apiService: ApiService);
    ngOnInit(): Promise<void>;
    mapData(result: any[], datasource: Datasource): void;
    getSelected(optValue: string): string;
    readonly optionsPopulated: boolean;
    readonly isInvalid: any;
    readonly show: boolean;
    readonly alert: any;
    readonly answerValue: any;
    /**
     * Filter out question options based on the value of other form fields
     * @param CardOption[] options
     */
    private filterQuestionOptions;
    /**
     * If there is currently a value in this dropdown then return its index within the
     * current question.options
     * @return number valueIdx
     */
    private getOptionValueIdx;
    private setSubscriptions;
}