var documentURLs = ["maca.pdf", "maca2.pdf"]
function printDocuments(index){
   if(index > documentURLs.length){
        return;
   }
   else {
     printJS({
       printable: documentURLs[index],
       type: 'pdf',
       onPrintDialogClose: function () {
         console.log(index);
          printDocuments(index  )
       }
     })
   }
}

<button type="button" onclick="printDocuments(0)">Print</button>

<iframe name="sif1" sandbox="allow-forms allow-modals allow-scripts" frameborder="0"></iframe>

This is not incrementing the index, always print first document and it is not stopping

CodePudding user response：

It behaves exactly as it should. If you want to call printDocuments with the next index, you should use printDocument( index) or justprintDocument(index 1), because it's the least confusing one. i returns current value of i and then adds 1. i first adds 1 and returns that increased value (so i 1).