Small imposition script: Where to start?

I tried to follow your clue and got it work. BUT: sadly not every page is imported at the right position (0,0) into the button field. Some pages have an y offset, some an x offset. I tried a lot, but couldn't find the bug. Here's my code up to now:

// doc0
var tDoc0 = this;
var tDoc0Path = tDoc0.path
tDoc1Path = tDoc0Path.replace(".pdf","_NEW.pdf");
var tDoc1Pages = tDoc0.numPages;
var tDoc1PagesLength = tDoc1Pages;
var tDoc1PagesOdd = (tDoc1Pages - 1) % 2;
var tSize = tDoc0.getPageBox("Crop",0);
var tWidth = tSize[2]-tSize[0];
var tHeight = tSize[1]-tSize[3];
var tBuffer = 10;
// doc1
var tDoc1 = app.newDoc(tWidth*2+tBuffer,tHeight+tBuffer);
tDoc1.setPageBoxes ({
  cBox: "Crop",
  nStart: 0,
  nEnd: 0,
  rBox: [0,tHeight,tWidth*2,0]
});
// insert 1st page as single page
tDoc1.insertPages ({
  nPage: -1,
  cPath: tDoc0Path,
  nStart: 0,
  nEnd: 0
});
if ( tDoc1PagesOdd ) {  // last page will be inserted as single page
  tDoc1PagesLength = tDoc1Pages - 1;
}
for ( p0 = 1, pp1 = 1; p0 < tDoc1PagesLength; p0++, pp1+=0.5 ) {
  p1 = parseInt(pp1);
  var tLeftPage = p0 % 2;
  if ( p1 > 1 && tLeftPage ) { 
       tDoc1.newPage({
            nPage: pp1,
            nWidth: tWidth*2+tBuffer,
            nHeight: tHeight+tBuffer
       });
       tDoc1.setPageBoxes ({
            cBox: "Crop",
            nStart: p1,
            nEnd: p1,
            rBox: [0,tHeight,tWidth*2,0]
       });
  } 
  var tRect = [];
  if ( tLeftPage ) {
       tRect = [0,0,tWidth,tHeight];  // left page
  } else {
       tRect = [tWidth,0,tWidth*2,tHeight];  // right page
  }
  var tBtn = tDoc1.addField({
       cName: "NextPage"+p0, 
       cFieldType: "button",
       nPageNum: p1,
       oCoords: tRect }
  );
  tBtn.buttonImportIcon({
       cPath: tDoc0Path,
       nPage: p0
  });
  tBtn.boderStyle = border.s;
  tBtn.strokeColor = color.transparent;
  tBtn.buttonPosition = position.iconOnly;
  tBtn.display = display.visible;
  tBtn.buttonFitBounds = true;
  tBtn.buttonAlignX = 0;
  tBtn.buttonAlignY = 0;
  tBtn.buttonScaleHow = scaleHow.proportional;
  tBtn.buttonScaleWhen = scaleWhen.never;
}
// insert last single page
if ( tDoc1PagesOdd ) {
  tDoc1.insertPages ({
  nPage: tDoc1.numPages - 1,
  cPath: tDoc0Path,
  nStart: tDoc1Pages - 1,
  nEnd: tDoc1Pages -1
  });
}

I used this freely available PDF for testing:

http://www.regensburger-orthopaedengemeinschaft.de/fileadmin/dateien/gemeinschaft/Orthojournal/16_01_OJ_26/OJ_26.pdf

Any helpful idea is very welcome!

Thanks

Tobias

As Bernd already suggested, the only way to do this in JavaScript is to use interactive buttons on which you then add a button icon that is a page from your PDF file that you want to impose.

Take a look at the following two API documentation pages:

Acrobat DC SDK Documentation - Doc.addField()

Acrobat DC SDK Documentation - Field.buttonImportIcon()

These two pages will allow you to add a button to a page and then import an image (representing a page) from a PDF file. To place and size the button, you will need to get the crop box of your page (which you very likely just created in your new document), via the Doc.getPageBox() method.

To get this right, you will have to spend a considerable amount of time on this project. And, especially if you are just starting out with Acrobat JavaScript development, it may be much cheaper to just buy an imposition solution for Adobe Acrobat. A good example would be Quite Imposing, which is an Acrobat plug-in that has been around for a long time: Quite Imposing: home page

You can create field buttons icon only)  and import the pages with the method buttonImportIcon.