Print-specific javascript

Is 开发者_Python百科there a way to run javascript at print time? I know of the IE onprintbefore event, but we use mostly Firefox.

What I'm trying to do is get element positions as they would be in the page rendered for printing so I can insert appropriate page breaks, basically to accomplish what the CSS "page-break-inside: avoid" attribute would do if it were implemented.

It seems that if I could force the javascript to run a separate time for the print rendering, I could do this.

Better use CSS media rule. Provide a print stylesheet.

<link rel="stylesheet" type="text/css" href="print.css" media="print">

Also see http://www.alistapart.com/articles/goingtoprint/.

You may be able to do this as a Firefox extension, otherwise, once you print, the javascript is out of the picture and the page is being sent to the printer.

The other option is to just send the page to the server and have it return a PDF for printing.