zulip/components/page-items.js

// components/page-items.js
import { LitElement, html, css } from 'lit'

class PageItems extends LitElement {
  static properties = {
    items: { type: Array },
    _draft: { type: String, state: true }
  }

  constructor() {
    super();
    this.items = [];
    this._draft = '';
  }

  static styles = css`
    :host { display: block; padding: 2rem 1.5rem; }
    h1 { font-size: 1.5rem; margin: 0 0 1.5rem; }
    .add-form {
      display: flex;
      gap: 0.5rem;
      margin-bottom: 2rem;
    }
    input {
      flex: 1;
      padding: 0.5rem 0.75rem;
      border: 1px solid #e2e8f0;
      border-radius: 6px;
      font-size: 0.9rem;
      outline: none;
    }
    input:focus { border-color: #94a3b8; }
    button {
      padding: 0.5rem 1rem;
      background: #0f172a;
      color: white;
      border: none;
      border-radius: 6px;
      font-size: 0.9rem;
      cursor: pointer;
    }
    button:hover { background: #1e293b; }
    ul { list-style: none; padding: 0; margin: 0; }
    li {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0.75rem 0;
      border-bottom: 1px solid #f1f5f9;
      font-size: 0.9rem;
    }
    .remove {
      background: none;
      border: none;
      color: #cbd5e1;
      cursor: pointer;
      font-size: 1rem;
      padding: 0;
    }
    .remove:hover { color: #ef4444; }
    .empty { color: #94a3b8; font-size: 0.9rem; }
  `

  #add() {
    const name = this._draft.trim()
    if (!name) return
    
    this.dispatchEvent(new CustomEvent('add-item', {
      detail: { item: { id: crypto.randomUUID(), name } },
      bubbles: true,
      composed: true
    }))
    
    this._draft = ''
  }

  #remove(id) {
    this.dispatchEvent(new CustomEvent('remove-item', {
      detail: { id },
      bubbles: true,
      composed: true
    }))
  }

  #onKeydown(e) {
    if (e.key === 'Enter') this.#add()
  }

  render() {
    const items = this.items ?? []

    return html`
      <h1>Items</h1>

      <div class="add-form">
        <input
          type="text"
          placeholder="New item…"
          .value=${this._draft}
          @input=${e => this._draft = e.target.value}
          @keydown=${this.#onKeydown}
        />
        <button @click=${this.#add}>Add</button>
      </div>

      ${items.length === 0
        ? html`<p class="empty">No items yet.</p>`
        : html`
          <ul>
            ${items.map(item => html`
              <li>
                <span>${item.name}</span>
                <button class="remove" @click=${() => this.#remove(item.id)}>✕</button>
              </li>
            `)}
          </ul>
        `}
    `
  }
}

customElements.define('page-items', PageItems)