使用jquery获取表中隐藏标签的值

我在列表视图中有一个html表，其中有一个隐藏的标签，名为"vehicle_num"。我可以获得表中所选的行以及任何td，但我似乎无法获得标签的值。我试过：

var vehicle_number = $(this).closest('tr').children('#vehicle_num').text();

下面是列表视图的代码。如何获取标签的值？

<asp:ListView ID="lvEquipmentList" runat="server" DataKeyNames="vehicle_number">
    <LayoutTemplate>
            <table id="table-equipment-list" class="table table-list">
                <thead>
                    <tr>
                        <th scope="col" class="product-line">Product line</th>
                        <th scope="col" class="model-number">Model #</th>
                        <th scope="col" class="serial-number">Serial #</th>
                        <th scope="col" class="dar-status">DAR Status</th>
                        <th scope="col" class="ship-date">Ship Date</th>
                    </tr>
                </thead>
                <tbody>
                    <asp:PlaceHolder ID="ItemPlaceholder" runat="server" /> 
                </tbody>
            </table>
    </LayoutTemplate>
    <ItemTemplate>
        <tr>
            <th scope="row" class="product-line"><div class="icon"><img src='<%#Eval("image_path")%>' onerror="this.src='assets/images/placeholder.png';" alt=""/></div> <span class="line-title"><%#Eval("product_line")%></span></th>
            <td class="model-number"><%#Eval("model")%><label class="vehicle_num" hidden="hidden"><%#Eval("vehicle_number")%></label></td>
            <td class="serial-number"><%#Eval("serial_number")%></td>
            <td class="dar-status"><img src='<%#Eval("display_status") %>'/></td>
            <td class="ship-date"><%#Eval("date")%></td>
        </tr>
    </ItemTemplate>
    <EmptyDataTemplate>
        <table id="table-equipment-list" class="table table-list">
            <thead>
                <tr>
                    <th scope="col" class="product-line">Product line</th>
                    <th scope="col" class="model-number">Model #</th>
                    <th scope="col" class="serial-number">Serial #</th>
                    <th scope="col" class="dar-status">DAR Status</th>
                    <th scope="col" class="ship-date">Ship Date</th>
                </tr>
            </thead>
            <tbody>
                <tr>
                    <th scope="row" class="product-line"><div class="icon"></div> <span class="line-title"></span></th>
                    <td class="model-number"></td>
                    <td class="serial-number"></td>
                    <td class="dar-status"></td>
                    <td class="ship-date"></td>
                </tr>   
            </tbody>
        </table>
    </EmptyDataTemplate>
</asp:ListView>

编辑

我已经编辑了上面的代码，将标签放在表格列中。我能够使用获得值

var vehicle_number = $(this).closest('tr').find('.vehicle_num').text();