how can I load the waypoint coordinates from Asp Label.Text

问题

First code in which i hardcore the value:

<script type="text/javascript">
    function myfunction() {
    var label3LatLng = 
document.getElementById('<%=TextBox1.ClientID%>').value;
      var label4LatLng = 
document.getElementById('<%=TextBox2.ClientID%>').value;
      
       
      L.Routing.control({
          waypoints: [
          L.latLng(21.5278654, 55.9196996), 
          L.latLng(23.5278654, 55.9196996) 

          ],
          routeWhileDragging: true,
          geocoder: L.Control.Geocoder.nominatim()
       
      }).addTo(map);
    }

Output:[![Output with hardcore][1]][1]

Code with textbox or labels: <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>

             <asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>         
         
         
             <input type="button" onclick="myfunction()" value="Click Me" 
style="width:300px;">
            
        </td>
    </tr>
</table>

<div id="d1"></div>
<script type="text/javascript">
    function myfunction() {
    var label3LatLng = 
document.getElementById('<%=TextBox1.ClientID%>').value;
      var label4LatLng = 
document.getElementById('<%=TextBox2.ClientID%>').value;
      
       
      L.Routing.control({
          waypoints: [
          L.latLng(label3LatLng.trim()), // This assumes the label contains both latitude & longitude.
          L.latLng(label4LatLng.trim()) // Note: call trim to remove any potential whitespace.

          ],
          routeWhileDragging: true,
          geocoder: L.Control.Geocoder.nominatim()
       
      }).addTo(map);
    }

[![Output when entered with TextBox][2]][2]

Even if i enter the values in the Textbox Alert message shows the value but routing machine shows empty values. [1]: https://i.stack.imgur.com/x85v2.png [2]: https://i.stack.imgur.com/7MzyC.png

来源：https://stackoverflow.com/questions/65305764/how-can-i-load-the-waypoint-coordinates-from-asp-label-text