Question

26

How can I execute Javascript function before Page load?

rated 0 times [ 32] [ 6] / answers: 1 / hits: 26015 / 15 Years ago, wed, may 20, 2009, 12:00:00

I am using a hidden field 'Isjsenabled' to detect whether Client's Javascript is enabled or disabled. If Javascript is enabled, Javascript function will be fired and it will set hidden field's value to 1.

I want to check the hidden value from server side Page_load. But the problem is Javascript gets fired after Page load.

Do you have any suggestion ?

Html Part

<script type=text/javascript>

    $(function() {

        $(#<%= Isjsenabled.ClientID %>).val(1);

    }); 

</script>



<input id=Isjsenabled runat=server value =0  type=hidden  />

Code Behind Part

protected void Page_Load(object sender, EventArgs e) {                

    HtmlInputHidden hdn = this.FindControl(Isjsenabled) as HtmlInputHidden;

        if (hdn != null)

            if (hdn.Value != null && hdn.Value == 0)

                Helper.SetCookie(IJE, 0);

            else

                Helper.SetCookie(IJE, 1);

}

Answers

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analiseb

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answered 15 Years ago daveon · Accepted Answer

Without thinking too hard about the direction you're trying to go in, there is a little used tag that is supported by all browsers called NOSCRIPT.

<noscript>

<img src=http://myserver/notify_no_script.aspx style=display:none>

</noscript>

As you can see, the idea is to make the browser request an image but only if javascript is disabled. This page could set a session variable stating that the current client has no script capability that would be available to all code in the current session.

Or, you could follow your current methodology:

<noscript>

<input type=hidden name=noscript value=1>

</noscript>

<script><!--

document.writeline('<input type=hidden name=noscript value=0>');

//--></script>

Hope this helps,

-Oisin