How do I display authorized signature only when user tries to print certificate

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I want to display signature of the person in the asp.net page only when user clicks on print button.

I have created a certificate page where page can have digital signature of the person
but user should able to see signature only in the print preview page but not in the actual aspx page.

How can i achieve this..any suggestions please.

Thanks in Advance..

What I have tried:

JavaScript

function cert_Print() {
            
                var contents = document.getElementById("divPrintContent").innerHTML;
                var frame1 = document.createElement('iframe');
                frame1.name = "frame1";
                frame1.style.position = "absolute";
                frame1.style.top = "-1000000px";
                document.body.appendChild(frame1);
                var frameDoc = frame1.contentWindow ? frame1.contentWindow : frame1.contentDocument.document ? frame1.contentDocument.document : frame1.contentDocument;
                frameDoc.document.open();
                frameDoc.document.write('');
                frameDoc.document.write('');
                frameDoc.document.write(contents);
                frameDoc.document.write('');
                frameDoc.document.close();
                setTimeout(function () {
                    window.frames["frame1"].focus();
                    window.frames["frame1"].print();
                    document.body.removeChild(frame1);
                }, 500);
                return false;
            }

Posted 13-Jan-17 20:35pm

syedkhaleel2010

Updated 14-Jan-17 2:25am

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Afzaal Ahmad Zeeshan · Answer 1 · 2017-01-14T02:25:00

In ASP.NET (or overall web development), did you know that CSS can control what is shown on screen and what is hidden, until a state is met? Such as being in the state of printed?

You can hide the sign,

CSS

#signelement {
   display: none;
}

Then, you can show it in the printed version of your web page, using CSS3 media queries,

CSS

@media print {
   #signelement {
      display: inline-block; /* Or whatever. */
   }
}

This will control even the elements created by JavaScript on runtime. So you can easily manage what is visible and what is hidden from the user.

For more, Using media queries - CSS | MDN[^]