Show number of results per page

interface User {
  id: string;
  firstName: string;
  lastName: string;
  age: number;
}

const [users] = useState<User[]>(() => generateUsers());
const [page, setPage] = useState<number>(1);
const [perPage, setPerPage] = useState<number>(10);

const offset = (page - 1) * perPage;
const pageUsers = users.slice(offset, offset + perPage);

function changePage(newPage: number) {
  setPage(newPage);
}

function handlePerPageCountChangeEvent(event: GoabDropdownOnChangeDetail) {
  setPage(1);
  setPerPage(parseInt(event.value || "10"));
}

<GoabTable width="100%" mb="xl">
  <thead>
    <tr>
      <th>First name</th>
      <th>Last name</th>
      <th>Age</th>
    </tr>
  </thead>
  <tbody>
    {pageUsers.map((u) => (
      <tr key={u.id}>
        <td>{u.firstName}</td>
        <td>{u.lastName}</td>
        <td>{u.age}</td>
      </tr>
    ))}
  </tbody>
</GoabTable>

<GoabBlock alignment="center" width="100%">
  <GoabBlock mb="m" alignment="center">
    Show
    <GoabDropdown
      onChange={handlePerPageCountChangeEvent}
      value={perPage.toString()}
      width="9ch"
    >
      <GoabDropdownItem value="10" label="10" />
      <GoabDropdownItem value="20" label="20" />
      <GoabDropdownItem value="30" label="30" />
    </GoabDropdown>
    <span style={{ width: "75px" }}>per page</span>
  </GoabBlock>
  <GoabSpacer hSpacing="fill" />
  <GoabPagination
    itemCount={users.length}
    perPageCount={perPage}
    pageNumber={page}
    onChange={(event) => changePage(event.page)}
  />
</GoabBlock>

  users: User[] = generateUsers();
  page = 1;
  perPage = 10;

  get pageUsers(): User[] {
    const offset = (this.page - 1) * this.perPage;
    return this.users.slice(offset, offset + this.perPage);
  }

  handlePageChange(event: GoabPaginationOnChangeDetail): void {
    this.page = event.page;
  }

  handlePerPageCountChangeEvent(event: GoabDropdownOnChangeDetail): void {
    this.page = 1;
    this.perPage = Number(event.value);
  }
}

function generateUsers(): User[] {
  const firstNames = [
    "Emma",
    "Liam",
    "Olivia",
    "Noah",
    "Ava",
    "James",
    "Sophia",
    "William",
    "Isabella",
    "Oliver",
    "Mia",
    "Benjamin",
    "Charlotte",
    "Elijah",
    "Amelia",
    "Lucas",
    "Harper",
    "Mason",
    "Evelyn",
    "Logan",
  ];
  const lastNames = [
    "Smith",
    "Johnson",
    "Williams",
    "Brown",
    "Jones",
    "Garcia",
    "Miller",
    "Davis",
    "Rodriguez",
    "Martinez",
    "Wilson",
    "Anderson",
    "Taylor",
    "Thomas",
    "Moore",
    "Jackson",
    "Martin",
    "Lee",
    "Thompson",
    "White",
  ];
  const users: User[] = [];
  for (let i = 1; i <= 100; i++) {
    users.push({
      id: `user-${i}`,
      firstName: firstNames[(i - 1) % firstNames.length],
      lastName: lastNames[(i - 1) % lastNames.length],
      age: 20 + (i % 40),
    });
  }
  return users;

<goab-table width="100%" mb="xl">
  <thead>
    <tr>
      <th>First name</th>
      <th>Last name</th>
      <th>Age</th>
    </tr>
  </thead>
  <tbody>
    @for (user of pageUsers; track $index) {
    <tr>
      <td>{{ user.firstName }}</td>
      <td>{{ user.lastName }}</td>
      <td>{{ user.age }}</td>
    </tr>
    }
  </tbody>
</goab-table>

<goab-block alignment="center" width="100%">
  <goab-block mb="m" alignment="center">
    Show
    <goab-dropdown
      (onChange)="handlePerPageCountChangeEvent($event)"
      [value]="perPage.toString()"
      width="9ch"
    >
      <goab-dropdown-item value="10" label="10"></goab-dropdown-item>
      <goab-dropdown-item value="20" label="20"></goab-dropdown-item>
      <goab-dropdown-item value="30" label="30"></goab-dropdown-item>
    </goab-dropdown>
    <span style="width: 75px">per page</span>
  </goab-block>

  <goab-spacer hSpacing="fill"></goab-spacer>

  <goab-pagination
    [itemCount]="users.length"
    [perPageCount]="perPage"
    [pageNumber]="page"
    (onChange)="handlePageChange($event)"
  >
  </goab-pagination>
</goab-block>

const firstNames = [
  "Emma",
  "Liam",
  "Olivia",
  "Noah",
  "Ava",
  "James",
  "Sophia",
  "William",
  "Isabella",
  "Oliver",
  "Mia",
  "Benjamin",
  "Charlotte",
  "Elijah",
  "Amelia",
  "Lucas",
  "Harper",
  "Mason",
  "Evelyn",
  "Logan",
];
const lastNames = [
  "Smith",
  "Johnson",
  "Williams",
  "Brown",
  "Jones",
  "Garcia",
  "Miller",
  "Davis",
  "Rodriguez",
  "Martinez",
  "Wilson",
  "Anderson",
  "Taylor",
  "Thomas",
  "Moore",
  "Jackson",
  "Martin",
  "Lee",
  "Thompson",
  "White",
];
const users = [];
for (let i = 1; i <= 100; i++) {
  users.push({
    id: "user-" + i,
    firstName: firstNames[(i - 1) % firstNames.length],
    lastName: lastNames[(i - 1) % lastNames.length],
    age: 20 + (i % 40),
  });
}

let page = 1;
let perPage = 10;

const tableBody = document.getElementById("table-body");
const pagination = document.getElementById("pagination");
const dropdown = document.getElementById("per-page-dropdown");

function renderTable() {
  const offset = (page - 1) * perPage;
  const pageUsers = users.slice(offset, offset + perPage);

  tableBody.innerHTML = pageUsers
    .map(
      (u) => `
      <tr>
        <td>${u.firstName}</td>
        <td>${u.lastName}</td>
        <td>${u.age}</td>
      </tr>
    `,
    )
    .join("");
}

pagination.addEventListener("_change", (e) => {
  page = e.detail.page;
  renderTable();
});

dropdown.addEventListener("_change", (e) => {
  perPage = parseInt(e.detail.value);
  page = 1;
  pagination.setAttribute("perpagecount", perPage);
  pagination.setAttribute("pagenumber", "1");
  renderTable();
});

renderTable();

<goa-table version="2" width="100%" mb="xl">
  <table width="100%">
    <thead>
      <tr>
        <th>First name</th>
        <th>Last name</th>
        <th>Age</th>
      </tr>
    </thead>
    <tbody id="table-body">
      <!-- Rows populated by JavaScript -->
    </tbody>
  </table>
</goa-table>

<goa-block alignment="center" width="100%">
  <goa-block mb="m" alignment="center">
    Show
    <goa-dropdown version="2" id="per-page-dropdown" value="10" width="9ch">
      <goa-dropdown-item value="10" label="10"></goa-dropdown-item>
      <goa-dropdown-item value="20" label="20"></goa-dropdown-item>
      <goa-dropdown-item value="30" label="30"></goa-dropdown-item>
    </goa-dropdown>
    <span style="width: 75px">per page</span>
  </goa-block>

  <goa-spacer hspacing="fill"></goa-spacer>

  <goa-pagination
    version="2"
    id="pagination"
    itemcount="100"
    perpagecount="10"
    pagenumber="1"
  >
  </goa-pagination>
</goa-block>