carbon-components-svelte/docs/src/pages/framed/DataTable/DataTableExpandableSelectable.svelte

<script>
  import { DataTable } from "carbon-components-svelte";

  let expandedRowIds = [];
  let selectedRowIds = [];

  $: {
    console.log("expandedRowIds", expandedRowIds);
    console.log("selectedRowIds", selectedRowIds);
  }
</script>

<DataTable
  batchExpansion
  batchSelection
  bind:expandedRowIds
  bind:selectedRowIds
  headers="{[
    { key: 'name', value: 'Name' },
    { key: 'protocol', value: 'Protocol' },
    { key: 'port', value: 'Port' },
    { key: 'rule', value: 'Rule' },
  ]}"
  rows="{Array.from({ length: 6 }).map((_, i) => ({
    id: i,
    name: 'Load Balancer ' + (i + 1),
    protocol: 'HTTP',
    port: i % 3 ? (i % 2 ? 3000 : 80) : 443,
    rule: i % 3 ? 'Round robin' : 'DNS delegation',
  }))}"
>
  <svelte:fragment slot="expanded-row" let:row>
    <pre> {JSON.stringify(row, null, 2)}</pre>
  </svelte:fragment>
</DataTable>