Javascript 如果从django表单项中选择了下拉选项，则显示引导模式

我正在Django中构建一个表单，当从下拉列表中选择“是”时，我试图获得一个模式弹出窗口，如果选择“否”，则不会发生任何事情

这就是我所尝试的：

models.py：

BOOL = (
        ('Yes', 'Yes'), ('No', 'No'),
    )
    
    multipleActiveRegions = models.CharField(max_length=5, choices=BOOL, default='No')

html格式：

<label class="col-sm-2 col-form-label">Multiple active regions?</label>
                        <div class="col-sm-4" id="SelectYes">
                            {{ form.multipleActiveRegions }}</div>

 <div class="modal fade" id="ModalOpen" tabindex="-1" role="dialog" aria-labelledby="exampleModalLongTitle" aria-hidden="true">
    <div class="modal-dialog" role="document">
       <div class="modal-content">
           <div class="modal-header">
                   <h5 class="modal-title" id="exampleModalLongTitle">Modal title</h5> </div>
                   
                   <!-- Modal Body -->
                   <div class="modal-body">
                     <h1>Test Open Modal on Selection</h1>
                   </div>

           </div>
           <div class="modal-footer">
           <button type="button" class="btn btn-secondary" data- 
                                         dismiss="modal">Close</button>
           <button type="button" class="btn btn-primary">Save 
                                         changes</button>
     </div>
   </div>
</div>

$(function() {
  $('#SelectYes').on('change', function() {
    if ($(this) === 'Yes') {
      $('#ModalOpen').modal('show');
    }
  });
});