javascript - 如何根据选定的下拉列表更改提交按钮 ID？

Question

我想根据选定的下拉列表更改提交按钮 ID 而无需提交。如果我选​​择了实时书签，提交按钮的 ID 应更改为 A1 而无需提交。我该怎么做。有人可以建议吗？下面是我的代码

<form class="form-horizontal" role="form" action="" method="post" enctype="multipart/form-data">
           <div class="row">
              <div class="col-md-12">
                 <div class="form-group">
                    <div class="col-md-9">
                       <select id="one" name="sub" class="form-control" onchange="myFunction()">
                          <option value="0">Select</option>
                          <option value="H1" id="A1" >Live Bookmark</option>
                          <option value="H2" id="A2">My Yahoo</option>
                          <option value="H3" id="A3">My Free Dictionary</option>
                          <option value="H4" id="A4">My Daily Rotation</option>
                          <option value="H5" id="A5">My Podnova</option>
                       </select>
                    </div>
                 </div>

                 <div class="form-group">
                    <div class="col-md-9">
                       <button type="submit" name="submit" id="$id">Subscribe Now</button>
                    </div>
                 </div>

              </div>
           </div>
        </form>

Answer 1

您可以在选择下拉列表中监听 change 事件，并动态分配 id 属性，如下面的代码片段所示:

$('document').ready(function(){

$('#one').on('change', function() {
  $('button[type=submit]').attr('id', $(this).find(":selected").attr('id'));
  console.log('Button Id is '+ $(this).find(":selected").attr('id'));
})

})

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.js"></script>
<form class="form-horizontal" role="form" action="" method="post" enctype="multipart/form-data">
           <div class="row">
              <div class="col-md-12">
                 <div class="form-group">
                    <div class="col-md-9">
                       <select id="one" name="sub" class="form-control">
                          <option value="0">Select</option>
                          <option value="H1" id="A1" >Live Bookmark</option>
                          <option value="H2" id="A2">My Yahoo</option>
                          <option value="H3" id="A3">My Free Dictionary</option>
                          <option value="H4" id="A4">My Daily Rotation</option>
                          <option value="H5" id="A5">My Podnova</option>
                       </select>
                    </div>
                 </div>

                 <div class="form-group">
                    <div class="col-md-9">
                       <button type="submit" name="submit" id="$id">Subscribe Now</button>
                    </div>
                 </div>

              </div>
           </div>
        </form>