Silent print to pdf using button action javascript

I have a button in a pdf form that has an on focus action to run a javascript. I need to print to pdf(or just save) without print dialog, or save dialog. I want to specify the name in the script using a variable:

var name="test";
var file_path="C:/Users/user/Desktop/Forms/"+name+".pdf";

 and after pressing the button, the test.pdf should appear in the specified path without any dialog window.

I tried:

var name="test";
var file_path="C:/Users/user/Desktop/Forms/"+name+".pdf";
var printer = this.getPrintParams();
printer.fileName = "";
printer.printerName = "Adobe PDF";
this.print(pp);
app.openDoc({cPath:file_path, bUseConv:true}; 
this.saveAs(this.path);

Nothing happens and the test.pdf isn't in the path.