How to share a C# Integer variable with JavaScript

Question

I want to share the currentTab variable which exists on the C# server side with JavaScript. Here is my code:

C#:

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Answer 1

You can write the index from your javascript function, to a hiddenfield, and then read that on postback.

In your code, you check the hiddenfield, if your page is postback. Like so:

protected void Page_Load(object sender, EventArgs e)
    {
        if (Page.IsPostBack)
        {
            currentTab = Int32.Parse(HiddenTabValue.Value);
        }

    }

Answer 2

Have a server side hidden field to hold this piece of information.

You can access the field through javascript and as a server side control the value will be available server side.

Answer 3

You need to use some server control to send value back to the server (i.e. asp:HiddenField) or use query string to set the tab index there.