Pass javascript variable to Codebehind

Question

Is it posible to get a value from a javascript variable and use it into visual basic code without incrusting value on any control.

It kinda depends on what kind of situation you want to get a javascript variable. Do you want to get it after a button clicked ? — maxisam
– maxisam, Commented Dec 27, 2011 at 2:02

Tim Schmelter · Accepted Answer · 2011-12-26 23:07:20Z

9

You cannot access a js-variable from codebehind without any help of a server-control. You could redirect the page to itself and pass that value as URL-Parameter(window.location.href = window.location.href + "?value=test";). But i assume that this is not what you want because it forces a postback. So the best way is to use a hiddenfield:

In javascript function:

<script type="text/javascript">
    function Foo(){
        var hidden=document.getElementById('hidValue');
        hidden.value="test";
    }
</script>

On aspx:

<Input id="hidValue" type="hidden" runat="server" />

In code behind

Protected hidValue As HtmlControls.HtmlInputHidden

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
    Dim hiddenValue = hidValue.Value
End Sub

edited Dec 26, 2011 at 23:07

answered Dec 26, 2011 at 21:59

Tim Schmelter

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user3285528 · Accepted Answer · 2014-02-07 21:00:34Z

0

if possible (is available) try to assign value in java to document.cookie = javavalue and then get it from codebehind var x= document.cookie (either via webbrowser or page)

answered Feb 7, 2014 at 21:00

user3285528

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