Print a local file with javascript

Print from client-side = form the browser via javascript

It's not possible to do this from client-side (= from inside the Browser). There are hackish solutions out there, which might work for IE, like the one here: HTML / Javascript One Click Print (no dialogs), but in general "if you try to print, the dialog will pop up" = default behaviour of "window.print()".

Print from server-side

Basically you use the server-side (PHP) to print the document, instead of the client. So you might use an Ajax request (user clicks on the print button) handing the filename or the content to print over to the "print.php" file on the server, which does the job of pushing the content to the printer.

Of course, you'd have to know which printer the user wants the content to be printed at...

There are several ways to print from PHP.

One option would be to use the php_printer extension:

$handle = printer_open(); 
printer_set_option($handle, PRINTER_MODE, "raw"); 
printer_write($handle,$myfile); 
printer_close($handle);

Or just copyor print to the printer:

exec('copy C:\file.txt com1');
exec('copy C:\file.txt lpt1');
exec('print /d:LPT1: C:\file.txt');

If you have network printer, you could try to send your content to the network address. There are some PHP utils around to work with LPR: https://github.com/Craswer/PhpNetworkLprPrinter

Referencing: https://stackoverflow.com/a/5695181/1163786

Question from comment: How can i set printer options from PHP on Windows?

This very easy on Linux because lpr accepts options lpr <options> - but that's not the case on Windows. So, here are some Windows specific tricks to configure the printer:

Windows7 has PRINTUI.EXE - a shorthand for RUNDLL32 PRINTUI.DLL,PrintUIEntry

Please see PrintUI Reference for examples.

You can configure your printer manually, for instance activate duplex mode, then save the settings file and re-use it, when printing from PHP. This allows to work with multiple printer configuration files.

The easiest way is to configure the printer in your env and then access it by name, "Printer-HP-XY-DuplexOn-2PagesOn1". In other words: it's configured outside and not from within PHP, only accessed from there.