用javascript打印pdf

Question

I know that there are a lot of questions about this, but I test all and not fix my problem. I have the following code:

var datauri = //PDF in base64
popup = window.open("", "Your PDF","width=1024,height=768,resizable=yes,scrollbars=yes,toolbar=no,location=no,directories=no,status=no,menubar=no,copyhistory=no,id='printPDF'");       
popup.document.location.href = datauri;//show pdf in other page
popup.print();//print pdf

But, when I print the PDF, the page appear empty, but when I close the window of print, show the PDF, I tried with a lot of stuff, but nothing works, please help me :(

Answer 1

Oh wait a minute, I think I see what might go wrong.

The datauri variable is effectively the URL of the popup. But you're using it wrong.

First, take a look at the documentation .

var windowObjectReference = window.open(strUrl, strWindowName[, strWindowFeatures]);

As you can see, the first argument is strUrl , an URL for the new popup. You give an empty argument, which isn't good to begin with.

What happens, is probably this:

1. The popup gets created.
2. The data URL is passed to the popup. The PDF starts loading in the background.
3. The print dialog comes up, which finds an empty document (the PDF hasn't loaded yet) and thus prints an empty page.
4. The PDF finishes loading, at which point you can print it (after you dismissed the first popup).

So, instead of doing this:

popup.document.location.href = datauri;

You should pass the datauri as the first argument to window.open , which is an empty string in your code fragment.

I hope this helps.