Question

我有一个添加2个选项（国家和城市）的客户页面。当我选择Country并选择USA时，第二个选择将包含美国城市的选项。如果我选择Philippines，则选项将是菲律宾的城市，与Canada等相同。

我的代码是这样的：

<select class="form-control" name="country" required>
          <option selected disabled>*Select Country </option>
          <option>USA</option>
          <option>Philippines</option>
          <option>Canada</option>

</select> &nbsp;&nbsp;&nbsp;

       //If 'USA' was selected the select options values will be this like.

        <select class="form-control" name="loc" required>
          <option selected disabled>*State / City</option>
          <option></option>
          <option>California</option>
          <option>New York</option>
          <option>New Jersey</option>
          <option>Illinois</option>
          <option>Others</option>
        </select>

     //else If 'Philippines' was selected the select options values will be this like.

        <select class="form-control" name="loc" required>
           <option selected disabled>*State / City</option>
          <option></option>
          <option>Manila</option>
          <option>Quezon City</option>
          <option>Makati</option>
          <option>Cebu</option>
          <option>Davao</option>
          <option>Others</option>



     //else If 'Canada' was selected the select options values will be this like.

        <select class="form-control" name="loc" required>
           <option selected disabled>*State / City</option>
          <option></option>
          <option>Toronto</option>
          <option>Vancouver</option>
          <option>Others</option>
        </select>

Answer 1

Kumusta Edmhar，

您展示的fiddle效果很好。只需在<head>代码中包含此行...

即可

<script src="https://code.jquery.com/jquery-2.1.1.min.js" type="text/javascript"></script>

快乐的编码！

注意：根据OP评论废弃原始答案。

Answer 2

为了轻松实现您想要的效果，您可以使用jQuery，您可以下载here。

然后，我为您的id字段和<select>标记添加了value个标记供您选择。

<select class="form-control" name="country" id="country" required>
  <option selected disabled>*Select Country </option>
  <option option="USA">USA</option>
  <option option="Philippines">Philippines</option>
  <option option="Canada">Canada</option>
</select>
<select class="form-control" name="loc" id="loc" required>
<!-- REST OF OTHER CODES -->

然后创建脚本：

<script src="jquery-1.9.1.min.js"></script><!-- REPLACE NECESSARY JQUERY FILE DEPENDING ON THE VERSION YOU HAVE DOWNLOADED -->

<!-- START CREATING YOUR SCRIPT -->
<script type="text/javascript">

  $(document).ready(function(){

    $("#country").change(function(){
       var country = $(this).val();
       var usa = '<option>California</option><option>New York</option><option>New Jersey</option><option>Illinois</option><option>Others</option>';
       var phi = '<option>Manila</option><option>Quezon City</option><option>Makati</option><option>Cebu</option><option>Davao</option><option>Others</option>';
       var can = '<option>Toronto</option><option>Vancouver</option>'; 
       var other = '<option selected disabled>*State / City</option>';

       if(country == "USA"){
         $("#loc").empty().append(usa);
       }
       else if(country == "Philippines"){
         $("#loc").empty().append(phi);
       }
       else if(country == "Canada"){
         $("#loc").empty().append(can);
       }
       else {
         $("#loc").empty().append(other);  
       }
    });

  });

</script>

看看这个JSFiddle。

我知道你的表格是静态的，我不得不废弃我的第一个答案。

根据国家/地区更改选项

2 个答案: