如何从动态选择下拉列表中提取值

Question

我正在构建一个需要动态下拉菜单的应用程序，并试图获取所生成的下拉菜单的值，但该方法无法正常工作。 我尝试了以下

get value from dynamic dropdown jquery

How do I dynamically set the selected option of a drop-down list using jQuery, JavaScript and HTML?

但是他们不为我工作

我想在ajax从数据库返回数据并将数据附加到选择元素之后，从id =“ fac_id”中获取值

$("#uni").change(function() {
  var uni = $("#uni").val();
  var fac = $("#fac_id");
  var options;

  //Make a request for a user with a given ID
  if (uni !== "") {

    fac.empty();
    fac.append("<option id='loading'>Loading...</option>");
    axios({
        method: 'get',
        url: 'faculties/' + uni,
        responseType: 'application/json',
      })
      .then(function(response) {
        if (response.data.length > 0) {
          options = "<option>Select Faculty</option>";
          response.data.forEach(element => {
            options += "<option value=" + element.fac_id + ">" + element.name + "</options>";
          });
          fac.empty();

          fac.append(options);
        } else {
          console.log("nothing");
          fac.empty();
          options += "<option value=''>No Faculty Found</options>";
          fac.append(options);
        }
      })
      .catch(function(error) {
        // handle error
        if (error.response.status === 401) {
          console.log("Unauthorized Access");
        }
      })
      .finally(function() {
        // always executed
      });

  }
});

    var content = [];
    $('#fac_id').on("change", function() {
         content.push($('#fac_id').val());
    });
    console.log(content);

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
 <div class="form-group">
     <label for="">University</label>
     <select name="uni_id" id="uni" class="form-control">
       <option value="ZOzYdjXNXibT0DtH9WrG">ANSU</option>                                    
       <option value="aQ6WWD2UX55VVlbkpdX8">FUTA</option>                                    
       <option value="8EKA7soQQgXT23z7ez4B">FUTO</option>                                    
     </select>
</div>
<div class="form-group">
     <label for="">Faculty</label>
     <select name="fac_id" id="fac_id" class="form-control">
       <option value="">Select Faculty</option>
     </select>
</div>