<select  class="form-control input-sm" name="category" lay-filter="category" aria-invalid="false">
                <option value="0">請選擇運維位置</option>
             
        
            </select>
  

            var category = 0;
            var categoryName = '';
            form.on('select(category)', function (data) {
                category = data.value;
                categoryName = data.elem[data.elem.selectedIndex].text;
                form.render('select'); 
            });