usth/ICT3.2/midterm/2.html


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<!DOCTYPE html>
<style>
h1 { text-align: center }
form {
    display: table;
    margin: 0 auto;
}
p { display: table-row }
.cell {
    margin: 0.2em 0;
}
</style>

<script>
function check() {
    const AGE = document.getElementById('age').value;
    // Number check is already handled by the number input.
    if (AGE < 0)
        alert('Age must be nonnegative.');

    const EMAIL = document.getElementById('email').value;
    if (EMAIL.match(/\w+@\w+\.\w+/) === null)
        alert('Invalid email!');

    const USER = document.getElementById('user').value;
    if (USER === '')
        alert('Your username is blank!  Please enter a nonempty username.');

    const PW = document.getElementById('pw').value;
    const PW2 = document.getElementById('pw2').value;
    if (PW != PW2)
        alert('Your password and confirmation password do not match!');
}
</script>

<html>
<body>
  <h1>Sign Up</h1>
  <form>
    <p>
      <label class=cell for=name>Full name:&emsp;</label>
      <input class=cell type=text id=name>
    </p>
    <p>
      <label class=cell for=gender>Gender:&emsp;</label>
      <select name=gender id=gender>
        <option value=''>-Select one-</option>
        <option value=male>Male</option>
        <option value=female>Female</option>
        <option value=other>Other</option>
      </select>
    </p>
    <p>
      <label class=cell for=age>Age:&emsp;</label>
      <input class=cell type=number id=age>
    </p>
    <p>
      <label class=cell for=email>Email:&emsp;</label>
      <input class=cell type=email id=email>
    </p>
    <p>
      <label class=cell for=user>Username:&emsp;</label>
      <input class=cell type=text id=user>
    </p>
    <p>
      <label class=cell for=pw>Password:&emsp;</label>
      <input class=cell type=password id=pw>
    </p>
    <p>
      <label class=cell for=pw2>Re-type Password:&emsp;</label>
      <input class=cell type=password id=pw2>
    </p>
    <p>
      <span class=cell></span>
      <span class=cell>
        <input type=reset value=Clear>
        <input type=button onclick='check()' value=Submit>
      </span>
    </p>
  </form>
</body>
</html>