How to send data from JavaScript to ASP.NET

  $(document).ready(function () {
    $("#MainContent_ddlFieldName").on("change", function () {
                 var id = $(this).val();
                 var name = $(this + "option:selected").text();

                 $('#<%= lblValue.ClientID %>').text(name);
                 $('#<%= lblType.ClientID %>').text(id);
             });
         });


<asp:Label ID="lblValue" runat="server" Text="" Visible="true"></asp:Label>
 <asp:Label ID="lblType" runat="server" Text="" Visible="true"></asp:Label>



protected void btnSearch_Click(object sender, EventArgs e)
        {
             string strValue = lblValue.Text;
             string strType = lblType.Text;
        }

I am incorporating JavaScript and Asp.Net to extract the dropdownlist value and place it into a label. Even though it displays the text on the label, when I trigger a button or event, it reverts back to its previous value which is ""

If anyone could offer assistance with this, it would be greatly appreciated.

Thank you!

c#javascriptasp.netdynamic

Answer №1

Consider utilizing a hidden field

aspx page

<asp:HiddenField ID="hType" runat="server" ViewStateMode="Enabled" Value="" />
<asp:HiddenField ID="hValue" runat="server" ViewStateMode="Enabled" Value="" />
<asp:Label ID="lblValue" runat="server" Text="" Visible="true"></asp:Label>
<asp:Label ID="lblType" runat="server" Text="" Visible="true"></asp:Label>
<asp:Button Text="text" OnClick="btnSearch_Click" runat="server" />
<script type="text/javascript">
    $(document).ready(function () {
        $("#MainContent_ddlFieldName").live("change", function () {
            var id = $(this).val();
            var name = $(this + "option:selected").text();

            $('#<%= lblValue.ClientID %>').text(name);
            $('#<%= hValue.ClientID %>').val(name);
            $('#<%= lblType.ClientID %>').text(id);
            $('#<%= hType.ClientID %>').val(id);
        });
    });
</script>

code behind

    protected void btnSearch_Click(object sender, EventArgs e)
    { 
        //back-end code
        string strValue = hValue.Value;
        string strType = hType.Value;


    }

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