获取输入字段值发送到另一个输入字段

Question

我尝试从输入字段复制值并将其发送到另一个onkeyup，但它只提取值而不发送。

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function populateSecondTextBox() {
  document.getElementById('cepAddressRouteTransporter').value = document.getElementById('postal_code').value;
}

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<form action="transporter/route" method="post" role="form">
  <table id="address">
    <tr>
      <td class="label">Zip code</td>
      <td class="wideField">
        <input class="field" id="postal_code" name="postal_code" onkeyup="populateSecondTextBox();">
      </td>
    </tr>
  </table>
  <div class="input-field col s6">
    <i class="material-icons prefix">directions</i>
    <input placeholder="Ex: 18214-780" id="cepAddressRouteTransporter" name="cepAddressRouteTransporter" type="text" class="validate">
    <label for="cepAddressRouteTransporter">CEP:</label>
  </div>
</form>

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Answer 1

替换为我工作的头部或身体功能。

function populateSecondTextBox() {
    document.getElementById('cepAddressRouteTransporter').value = 
    document.getElementById('postal_code').value;
}

JSFiddle

Answer 2

做最简单的事情

onkeyup="document.getElementById('cepAddressRouteTransporter').value = this.value;"

如上所述更改你的onkeyup函数调用。