ASP.NET：回发后如何保留使用javascript在服务器控件上设置的值

Question

I'm creating an ASP.NET website which will does some calculations (if it's relevant it uses some formulas to calculate retirement plans) the first page, has a bunch of fields and labels that the user will input the numbers, and on key-down i have the JavaScript code running calculations and updating the labels with the numbers. Then I want to pass these values over to the next page where they will be parsed and put into a bar graph for a summary, However I keep getting the default value of the labels. I know this is related to the postback of the page.

I have tried using hidden fields, to store the values but they also are being reset. A lot of the solutions I've seen that are similar to that here I've also tried to no avail.

The javascript code is as follows:

function RATotal() {
    $('#lblRATotal').text("$" + (masterRANQAptERI + masterRAPTQptERI + 
                                 masterRARQAptERI + lumpsum).format());

    masterRATotal = (masterRANQAptERI + masterRAPTQptERI + masterRARQAptERI + lumpsum);

    document.getElementById('<%= hiddenRAtotal.ClientID %>').value = masterRATotal;
    document.getElementById('hideRAtotal').value = masterRATotal;
}

the ASP/HTML:

<tr>
  <td>
    <span>Total After-Tax Equivalent Contribution: </span>
    <asp:Label runat="server" ID="lblRAATTotal" Text="$X.XX" Font-Bold="true" />
  </td>
  <td>
    <span>Total Pre-Tax Equivalent Contribution: 
      <asp:Label runat="server" ID="lblRAPTTotal" Text="$X.XX" Font-Bold="true" />
    </span>
  </td>
  <td>
    <span>Total Retirement Retirement Income:</span>
    <br />
    <asp:Label runat="server" ID="lblRATotal" Text="0.00" Font-Bold="true" />
    <asp:HiddenField runat="server" ID="hiddenRAtotal" EnableViewState="True" />
    <input id='hideRAtotal' name='hideRAtotal' type='hidden' />
  </td>
</tr>

The C# code is as follows

protected void btnSummary_Click(object sender, EventArgs e)
{
    string RAOtotal2 = hiddenRAtotal.Value.ToString();
    Session["RAOtotal"] = RAOtotal2
    Response.Redirect("ChartDataQuery.cshtml");
}

Based on everything I've read, this should do the trick... but I am actually just getting a "," or null when I try to play around with it. I've deducted the "," isn't a miscalc because when I set the value to a manually defined string i would also just get a ",". I am still learning these kinds of things, and I would appreciate any help! Thanks!

Answer 1

Thanks to @wazz for helping me out with this one.

the line, document.getElementById('<%= hiddenRAtotal.ClientID %>').value = masterRATotal; is what was breaking this. I removed the line, and it is now working.