asp.net c# force page reload on browser print hotkey

Question

Is there any way to run code in my asp.net c# web application if the print hotkey (ctrl+P) is pressed by the user?

I have an multiline asp:TextBox and I need to calculate the number of rows to generate the correct height of the textbox for the document. Atm I have an Print- Button, which works really fine, but I want to run the same code if the browser print function is used by the user.

Thank you in advance

why not use Javascript to calculate the rows, instead? Then you don't need a request to the server. — ADyson, Oct 01 '20 at 08:09
That would be possible too but I prefer the solution with server request because I can do some additional stuff in one step. Thank you anyway, I appreciate your help. — raven_977, Oct 02 '20 at 07:33

score 2 · Accepted Answer · answered Oct 01 '20 at 08:12

I would do something like this in Webforms. Make a dummy Button or LinkButton and trigger the click on that with jQuery when Control+P is pressed. Then in code behind write window.print() to the page with the ScriptManager.

The <span> element in the LinkButton is needed to register the click.

<script>
    $(window).bind('keydown', function (e) {
        if ((e.ctrlKey || e.metaKey) && String.fromCharCode(e.which).toUpperCase() === 'P') {
            $('#LinkButton1')[0].click(); 
            e.preventDefault();
        }
    });
</script>

<asp:LinkButton ID="LinkButton1" runat="server" 
    ClientIDMode="Static" OnClick="LinkButton1_Click"><span></span></asp:LinkButton>

And then the code

protected void LinkButton1_Click(object sender, EventArgs e)
{
    ScriptManager.RegisterStartupScript(Page, Page.GetType(), "PrintWindow", "window.print()", true);
}

Thank you very much, I love that solution – raven_977 Oct 02 '20 at 07:28 — raven_977, Oct 02 '20 at 07:28

asp.net c# force page reload on browser print hotkey

1 Answers1