dees-catalog/ts_web/elements/dees-input-dropdown.ts

import { customElement, LitElement, TemplateResult, property, html } from 'lit-element';
import * as domtools from '@designestate/dees-domtools';

declare global {
  interface HTMLElementTagNameMap {
    'dees-input-dropdown': DeesInputDropdown;
  }
}

@customElement('dees-input-dropdown')
export class DeesInputDropdown extends LitElement {
  public static demo = () => html`<dees-input-dropdown></dees-input-dropdown>`

  // INSTANCE
  public changeSubject = new domtools.rxjs.Subject();

  @property()
  public label: string = 'Label';

  @property()
  public key: string;

  @property()
  public options: {option: string, key: string, payload?: any}[] = [];

  @property()
  public selectedOption: {option: string, key: string, payload?: any} = {
    key: null,
    option: null,
    payload: null
  };

  @property({
    type: Boolean
  })
  public required: boolean = false;

  public render(): TemplateResult {
    return html`
      ${domtools.elementBasic.styles}
      <style>
        * {
          box-sizing: border-box;
        }

        :host {
          position: relative;
          display: block;
          height: 40px;
        }

        .maincontainer {
          display: block;
        }

        .label {
          font-size: 14px;
          margin-bottom: 15px;
        }

        .selectedBox {
          cursor: pointer;
          position: relative;
          max-width: 420px;
          height: 40px;
          border: 1px solid #CCC;
          padding: 12px;
          z-index: 0px;
        }

        .selectionBox {
          pointer-events: none;
          cursor: pointer;
          transition: all 0.2s ease;
          opacity: 0;
          position: relative;
          background: #ffffff;
          max-width: 420px;
          box-shadow: 0px 0px 5px  rgba(0,0,0,0.2);
          height: 40px;
          margin-top: -40px;
          z-index: 100;
        }

        .selectionBox.show {
          pointer-events: all;
          opacity: 1;
          min-height: 160px;
        }

        .option {
          padding: 12px;
        }

        .option:hover {
          background: #fafafa;
        }
      </style>
      <div class="maincontainer">
        <div class="selectedBox" @click="${event => {this.toggleSelectionBox();}}">
          ${this.selectedOption?.option}
        </div>
        <div class="selectionBox">
          ${this.options.map(option => {
            return html`
              <div class="option" @click=${() => {this.updateSelection(option);}}>${option.option}</div>
            `
          })}
        </div>
      </div>
    `;
  }

  firstUpdated() {
    this.selectedOption = this.options[0] || null;
  }

  public async updateSelection(selectedOption) {
    this.selectedOption = selectedOption;

    this.dispatchEvent(new CustomEvent('selectedOption', {
      detail: selectedOption,
      bubbles: true
    }));
    this.toggleSelectionBox();
    this.changeSubject.next(this);
  }

  public toggleSelectionBox() {
    this.shadowRoot.querySelector('.selectionBox').classList.toggle('show');
  }
}