WRNexusJS/examples/basic-app/app/pages/test.wrn

import AdvancedSelect from "@wrnexus/ui/components/AdvancedSelect.wrn"
import ComboBox from "@wrnexus/ui/components/Combobox.wrn"

// Component event test page. Route: /test
//
// Events bubble from the exact ComboBox or AdvancedSelect that emitted them.
// The <section> below listens once for every child component, while the first
// ComboBox also demonstrates a listener attached directly to one component.
page Test {
  layout = "public"

  state teams = [{ value: "design", label: "Design", description: "Product and visual design", icon: "icon-[lucide--palette]" }, { value: "engineering", label: "Engineering", description: "Platform engineering", icon: "icon-[lucide--code-2]" }, { value: "growth", label: "Growth", description: "Marketing and customer growth", icon: "icon-[lucide--trending-up]" }, { value: "support", label: "Support", description: "Customer operations", icon: "icon-[lucide--life-buoy]" }]
  state eventName = "No event yet"
  state eventSource = "Interact with a component"
  state eventPayload = "{}"
  state selectedTeam = ""

  seo {
    title = "Component event test"
    description = "Test ComboBox and AdvancedSelect events on one WRN page."
    canonical = "/test"
  }

  functions {
    function handleComponentEvent(event) {
      eventName = event.type
      eventSource = event.target.getAttribute("data-field") || event.detail.component
      eventPayload = JSON.stringify(event.detail, null, 2)
    }

    function handleTeamSelect(event) {
      selectedTeam = event.detail.value
    }
  }

  view {
    <header class="test-hero">
      <span>WRN component events</span>
      <h1>ComboBox and AdvancedSelect event test</h1>
      <p>
        This page contains multiple component instances. Every component has a
        unique <code>id</code> and <code>data-field</code>, so the event source
        is always identifiable.
      </p>
    </header>

    <!--
      Event delegation: these eight listeners receive events from every
      ComboBox and AdvancedSelect inside this section because the custom events
      bubble from their component roots.
    -->
    <section
      class="test-grid"
      @search="handleComponentEvent(event)"
      @select="handleComponentEvent(event)"
      @change="handleComponentEvent(event)"
      @clear="handleComponentEvent(event)"
      @open="handleComponentEvent(event)"
      @close="handleComponentEvent(event)"
      @load="handleComponentEvent(event)"
      @error="handleComponentEvent(event)"
    >
      <article class="test-card">
        <span class="test-card__type">Direct listener</span>
        <h2>Team ComboBox</h2>
        <p>
          Its <code>@select</code> listener updates the selected-team
          text below. The delegated section listener also receives the event.
        </p>

        <ComboBox
          id="team-combobox"
          data-field="team-combobox"
          name="team"
          label="Choose a team"
          placeholder="Search teams"
          options="{teams}"
          optionTemplate="icon"
          @select="handleTeamSelect(event)"
        />

        <output class="test-selection">
          Selected team: {selectedTeam || "None"}
        </output>
      </article>

      <article class="test-card">
        <span class="test-card__type">Second instance</span>
        <h2>Reviewer ComboBox</h2>
        <p>
          This is another ComboBox on the same page. Its events remain
          distinguishable through <code>data-field="reviewer-combobox"</code>.
        </p>

        <ComboBox
          id="reviewer-combobox"
          data-field="reviewer-combobox"
          name="reviewer"
          label="Choose a reviewer team"
          placeholder="Search reviewer teams"
          options="{teams}"
        />
      </article>

      <article class="test-card">
        <span class="test-card__type">Multiple selection</span>
        <h2>Project teams</h2>
        <p>
          AdvancedSelect emits the same event names. Multiple values are
          available through <code>event.detail.values</code>.
        </p>

        <AdvancedSelect
          id="project-teams"
          data-field="project-teams"
          name="projectTeams"
          label="Assign project teams"
          placeholder="Choose one or more teams"
          options="{teams}"
          multiple
          showCounter
          maxSelections="3"
          optionTemplate="icon"
        />
      </article>

      <aside class="event-monitor" aria-live="polite">
        <div>
          <span>Latest event</span>
          <strong>{eventName}</strong>
        </div>
        <div>
          <span>Source component</span>
          <strong>{eventSource}</strong>
        </div>
        <pre><code>{eventPayload}</code></pre>
      </aside>
    </section>
  }

  style {
    .test-hero {
      display: grid;
      max-width: 52rem;
      gap: 0.75rem;
      margin-block: 3rem 2rem;
    }

    .test-hero > span,
    .test-card__type,
    .event-monitor span {
      color: var(--wrn-color-primary);
      font-size: 0.72rem;
      font-weight: 800;
      letter-spacing: 0.08em;
      text-transform: uppercase;
    }

    .test-hero h1,
    .test-card h2,
    .test-hero p,
    .test-card p {
      margin: 0;
    }

    .test-hero p,
    .test-card p {
      color: var(--wrn-color-muted);
      line-height: 1.65;
    }

    .test-grid {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 1rem;
      margin-bottom: 4rem;
    }

    .test-card,
    .event-monitor {
      display: grid;
      align-content: start;
      gap: 1rem;
      padding: clamp(1rem, 3vw, 1.5rem);
      border: 1px solid var(--wrn-color-border);
      border-radius: var(--wrn-radius-lg);
      background: var(--wrn-color-surface);
      box-shadow: var(--wrn-shadow-1);
    }

    .test-selection {
      color: var(--wrn-color-muted);
      font-size: 0.82rem;
    }

    .event-monitor {
      position: sticky;
      bottom: 1rem;
      grid-column: 1 / -1;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      background: color-mix(in srgb, var(--wrn-color-surface) 94%, var(--wrn-color-primary));
    }

    .event-monitor > div {
      display: grid;
      gap: 0.35rem;
    }

    .event-monitor pre {
      grid-column: 1 / -1;
      max-height: 18rem;
      overflow: auto;
      margin: 0;
      padding: 1rem;
      border-radius: var(--wrn-radius-md);
      background: var(--wrn-color-bg);
      font-size: 0.75rem;
      line-height: 1.65;
      white-space: pre-wrap;
    }

    @media (max-width: 760px) {
      .test-grid {
        grid-template-columns: 1fr;
      }

      .event-monitor {
        grid-template-columns: 1fr;
      }

      .event-monitor pre {
        grid-column: auto;
      }
    }
  }
}