ASP Webforms hidden input lose value on postback?

Question

ASP Webforms hidden input lose value on postback?

1.4k views Asked by adam78 At 12 October 2016 at 10:48

I have the following hidden input field on a aspx page:

<asp:HiddenField ID="MySecretValue" runat="server" />

<asp:Button ID="Submit" runat="server" Text="Save" OnClick="submit_Click" CssClass="btn btn-primary" />

code behind:

protected void Page_Load(object sender, EventArgs e)
{

}

protected void submit_Click(object sender, EventArgs e)
{
    // Do some stuff

}

The hidden input is populated via some jQuery script. When the user submits the page I do some stuff inside the submit_Click method and redisplay the page. However when the page redisplays the hidden input field is empty. How do I ensure the hidden field keeps the value when the page is re-displayed?

Original Q&A

There are 1 answers

**Syed Mhamudul Hasan** · Answer 1 · 2016-10-12T11:58:20+00:00

This code does not lose value after post back ...Try this

Enable EnableViewState="true" in page directive or web.config

.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="StackOverflow_Solve.Others.WebForm1" EnableViewState="true" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <script src="../js/jquery.js" type="text/javascript"></script>
    <script>
        $(function () {
            //First time loaded value
             console.log($('#MySecretValue').val());
            $('#setHiddenValue').click(function() {
                $('#MySecretValue').val('1');
            });

        });
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <asp:HiddenField ID="MySecretValue" runat="server" ClientIDMode="Static" />

<asp:Button ID="Submit" runat="server" Text="Save"  CssClass="btn btn-primary" 
            onclick="Submit_Click" />
    </div>
    <div id="setHiddenValue">setHiddenValueByClick me</div>
    </form>
</body>
</html>

and .aspx.cs

public partial class WebForm1 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }

        protected void Submit_Click(object sender, EventArgs e)
        {
            //do all stuff
            String a = MySecretValue.Value;
            var dd = a;
        }
    }

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ASP Webforms hidden input lose value on postback?

There are 1 answers

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