APIExplorer.tsx

import { tsx } from "@dojo/framework/widget-core/tsx";
import { WidgetBase } from "@dojo/framework/widget-core/WidgetBase";
import { watch } from "@dojo/framework/widget-core/decorators/watch";
import Listbox from "@dojo/widgets/listbox";
import TextArea from "@dojo/widgets/text-area";
import theme from "@dojo/themes/dojo";
import * as css from "./styles/APIExplorer.m.css";

import { ExplorerProperties, Item } from "../interfaces";

export class APIExplorer extends WidgetBase<ExplorerProperties> {
  @watch() index = 0;
  @watch() label = "";

  onAttach() {
    this.properties.fetchAllResults();
  }
  protected render() {
    return (
      <div classes={css.root}>
        <Listbox
          theme={theme}
          key="listbox1"
          activeIndex={this.index}
          widgetId="listbox1"
          optionData={this.properties.items}
          getOptionLabel={(option: Item) => option.label}
          getOptionSelected={(option: Item) => option.label === this.label}
          onActiveIndexChange={(index: number) => {
            this.index = index;
          }}
          onOptionSelect={(option: Item, index: number) => {
            this.label = option.label;
            this.properties.fetchData(option);
          }}
        />
        <TextArea rows={15} theme={theme} value={this.properties.result} />
      </div>
    );
  }
}

// src/interfaces.ts
export interface ExplorerProperties {
  items: Item[];
  result: string;
  fetchAllResults: () => void;
  fetchData: (item: Item) => void;
}