Dropdown在fabric js的Materialize设计中不起作用

我使用的是实体化设计和fabric js库。我想更改画布中文本的字体样式。在物化设计之前，我使用了bootstrap，然后它运行良好。但现在我正在使用bootstrap的实体化设计位置，然后我的下拉菜单不起作用。

无材料化设计（Dropdown正在工作）

var canvas = new fabric.Canvas('canvas');
$('#font').change(function(){
  var obj = canvas.getActiveObject();
  if(obj){
    obj.setFontFamily($(this).val());
  }
  canvas.renderAll();
});
function addText() {
  var oText = new fabric.IText('Tap and Type', { 
    left: 100, 
    top: 100 ,
  });
  canvas.add(oText);
  canvas.setActiveObject(oText);
  $('#fill, #font').trigger('change');
  oText.bringToFront();
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://rawgit.com/kangax/fabric.js/master/dist/fabric.min.js"></script>
<button class="btn" onclick="addText()">Add Custom Text</button>
<select id="font">
  <option>arial</option>
  <option>tahoma</option>
  <option>times new roman</option>
</select>
<br />
<canvas id="canvas" width="750" height="550" style="border:1px solid #333"></canvas>

采用材料化设计（下拉不起作用）

var canvas = new fabric.Canvas('canvas');
$('#font').change(function(){
  var obj = canvas.getActiveObject();
  if(obj){
    obj.setFontFamily($(this).val());
  }
  canvas.renderAll();
});
function addText() {
  var oText = new fabric.IText('Tap and Type', { 
    left: 100, 
    top: 100 ,
  });
  canvas.add(oText);
  canvas.setActiveObject(oText);
  $('#fill, #font').trigger('change');
  oText.bringToFront();
}

<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/materialize/0.97.6/css/materialize.min.css">
<!-- Compiled and minified JavaScript -->
 <script src="https://cdnjs.cloudflare.com/ajax/libs/materialize/0.97.6/js/materialize.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://rawgit.com/kangax/fabric.js/master/dist/fabric.min.js"></script>
<div class="container">
<div class="row">
<div class="col s12">
<button class="btn" onclick="addText()">Add Custom Text</button>
<select id="font">
  <option>arial</option>
  <option>tahoma</option>
  <option>times new roman</option>
</select>
<br />
<canvas id="canvas" width="750" height="550" style="border:1px solid #333"></canvas>
</div>
</div>
</div>

我想在织物js中使用实体化设计。我想更改画布中文本的字体样式。