如何在选择另一个组合框时使一个组合框可见 - how to make a combobox visible upon selecting on another combobox in php?

how to make a combobox visible upon selecting on another combobox in php?

本文关键字：组合一个选择另一个 | 更新日期: 2023-09-27

我有两个组合框。我把第二个设置为隐藏，我想让第二个组合框在我从第一个组合框中选择一个后显示

<select name="users" onchange="showUser(this.value)">
  <option value="">Select a person:</option>
  <option value="1">Peter Griffin</option>
  <option value="2">Lois Griffin</option>
  <option value="3">Joseph Swanson</option>
  <option value="4">Glenn Quagmire</option>
  </select>
<select id="second_combo_box_id" style="visibility:hidden;" >
  <option value="">Select a option:</option>
  <option value="1">value 1</option>
  <option value="2">value 2</option>
  </select>

 <script src="//code.jquery.com/jquery-1.10.2.js"></script>
  <script>
function showUser(str) {
    $('#second_combo_box_id').css("visibility", "visible");
}
</script>