javascript - asp.net hiddenfield.value 未由 javascript 更新

Question

我想在回发之前通过 javascript 为 asp.net 隐藏字段赋值。

但是在后面的代码中，隐藏的字段值是空的。我使用的代码是:

<asp:UpdatePanel ID="UpdatePanel1" runat="server" ChildrenAsTriggers="True" Visible="True">
        <Triggers>
            <asp:AsyncPostBackTrigger   ControlID="save1"    EventName="Click">         
            </asp:AsyncPostBackTrigger>
        </Triggers>
        <ContentTemplate>
            <asp:HiddenField ID="HiddenField1" runat="server" />
       </div>

        </ContentTemplate>
   </asp:UpdatePanel>

 <asp:Button ID="save1" runat="server" Text="Send"  OnClientClick="return SaveFase();"  />

       function SaveFase() {     
           var UP = jQuery.get('<% = HiddenField1.ClientID %>');
           UP.Value= "xxxxxxxxxxxxxxxxxxxx"
          return true             
       }

Protected Sub PassBackImage(sender As Object, e As EventArgs) Handles save1.Click

      dim Value = HiddenField1.Value      
End Sub

Answer 1

使用 ID selector和 .val()方法:

var UP = jQuery('#<% = HiddenField1.ClientID %>');
UP.val("xxxxxxxxxxxxxxxxxxxx");