how can i get a ASP.NET session variable in javascript?

Question

i have a website a with some textfields.

website b is in the iframe of a.

I saved in website b some values in different sessions

  Session("anzahlInterneTeilnehmer") = anzahlInterneTeilnehmer
  Session("anzahlExterneTeilnehmer") = anzahlExterneTeilnehmer

after i saved the sessions i call the parent function from website a

parent.parentTeilnehmer()

i want to display the session values in the textfields of website a

            function parentTeilnehmer() {
            var intern = ????
            var extern = ????
            var InterneTextFeld = ISGetObject("WebInput1");
            var ExterneTextFeld = ISGetObject("WebInput2");
            InterneTextFeld.SetValueData(intern);
            ExterneTextFeld.SetValueData(extern);
        }

how can i do that without refreshing the whole page?

possible duplicate of Access ASP.NET session variable from JavaScript — Steve B
– Steve B, Commented Jan 29, 2013 at 10:12
Possible duplicate of Access ASP.NET session variable from JavaScript — AXMIM
– AXMIM, Commented Mar 27, 2017 at 13:48

Riain McAtamney · Accepted Answer · 2013-01-29 10:32:16Z

4

Session is stored server side so you cannot access these variables clientside via javascript. I suggest saving these variables to a hidden field

<input type="hidden" id="anzahlInterneTeilnehmer" runat="server" />
<input type="hidden" id="anzahlExterneTeilnehmer" runat="server" />

Attach an event handler to the Website A's page PreRender method and in there set the anzahlInterneTeilnehmer's value to the session value (excuse my VB)

Private Sub Page_Render(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MyBase.PreRender
anzahlInterneTeilnehmer.Value = Session("anzahlInterneTeilnehmer")
End Sub

Then in your javascript

var internHolder = document.getElementById("anzahlInterneTeilnehmer");
var intern = internHolder.value;

edited Jan 29, 2013 at 10:32

answered Jan 29, 2013 at 10:10

Riain McAtamney

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Nag · Accepted Answer · 2013-01-29 11:08:04Z

3

You can do like this in javascript

var val = <%= Session["MyVariable"]%>;

answered Jan 29, 2013 at 11:08

Nag

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Software Engineer · Accepted Answer · 2013-01-29 10:31:50Z

1

You can access Session variables in javascript only if your js function is present on .aspx page which is not a good approach as it is better to keep our script files in separate Scripts folder so you can store session values in hidden fields:

<script type="text/javascript">
    function GetSessionValues() {
        var intern = '<%=Session("InternalValue") %>';
        var extern = '<%=Session("ExternalValue") %>';
    }
</script>

answered Jan 29, 2013 at 10:31

Software Engineer

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1 Comment

Software Engineer Over a year ago

It works for me if I set Session("InternalValue") and Session("ExternalValue") at Page_Load event, how you do that ?

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