Access a javascript variable in code behind

Question

So here's what I'm trying to accomplish:

I have a client facing page that loads, and when that happens I automatically run a series of 4 quick tests, if any of those tests fail I update the HCresults variable.

.aspx

  <asp:Content ID="Content1" ContentPlaceHolderID="head" runat="server">
    <script language="javascript" src="script/XmlHttp.js?vers=<%=VersionInfo %>" type="text/javascript"></script>
    <script src="client_scripts/JQuery/jquery-1.9.1.js" type="text/javascript"></script>
    <script type="text/javascript">
        var HCresults = "";
    </script>
  </asp:Content>

I want to access the value of HCresults after the page finishes loading from my code behind page. Is there a way to do this?

Do you need this in a server form post? Do you have an event handler defined? — dana
– dana, Commented Aug 10, 2016 at 19:41
I know absolutely nothing about either of those. Today is my second day of dealing with web-dev in my internship. I don't have an event handler defined though, I can tell you that — jlee
– jlee, Commented Aug 10, 2016 at 19:48

madasu naga · Accepted Answer · 2016-08-10 20:09:47Z

1

You can write a webmethod in your code behind; pseudo code:

public static var HCresultsCS;
[webmethod]
public static void grabHCresults(var HCresultsfromJS)
{
HCresultsCS= HCresultsfromJS;
}

make an AJAX post to this webmethod with HCresults you're setting on a test failure as parameter;

Access the HCresultsCS from CS now. Check for nulls! I can't comment This link might be helpful: http://www.aspsnippets.com/Articles/Calling-ASPNet-WebMethod-using-jQuery-AJAX.aspx

answered Aug 10, 2016 at 20:09

madasu naga

1541 silver badge9 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Trasiva · Accepted Answer · 2016-08-10 20:00:13Z

0

Unfortunately not using JS, you can store the value in a hiddenfield however to retrieve in C#. Make sure that you set the attribute runat = "server" for the control. I should also mention you'll use element.value = value to assign the value.

edited Aug 10, 2016 at 20:00

answered Aug 10, 2016 at 19:50

Trasiva

4941 gold badge14 silver badges29 bronze badges

4 Comments

jlee Over a year ago

I think you may have it backwards? I'm trying to access a variable in my .aspx file from my .cs file

Trasiva Over a year ago

@jlee I realized that now. Answer is updated with the right context.

jlee Over a year ago

where does that value assignment occur? I assume you're talking about the value of the hiddenfield?

Trasiva Over a year ago

@jlee Yea, I'd have the assignment actually happen after the testing is over and you have issues. Yes to the second question, document.getElementById('hiddenfieldname').value = HCresults.

Collectives™ on Stack Overflow

Access a javascript variable in code behind

2 Answers 2

Comments

4 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

4 Comments

Your Answer

Sign up or log in

Post as a guest

Related