Copy text, images, tables, ALL formatting, margins from on GDoc to another

Question

After trying a few mail merge scripts, I decided t write my own. My merge script runs as a separate fiIt reads a template from a GDoc, reads data from a GSpreadsheet, and me

Answer 1

You should copy the template first using DocsList so you start with a "complete" initial document.

  var template = DocsList.getFileById(docIDs[0]);// get the template model, in this sample I had an array of possible templates, I took the first one
  var newmodelName=template.substr(0,11)+'multipage'+template.substring(18);// define a new name, do what you need here...
  var baseDocId = DocsList.copy(template,newmodelName).getId();// make a copy of firstelement and give it new basedocname build from the serie(to keep margins etc...)
  var baseDoc = DocumentApp.openById(baseDocId);// this is the new doc to modify

then use the document class that has a direct replaceText method

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EDIT : about your secondary question, here is a suggestion on how you could do. It works nicely except for inlineImage, I'll keep looking at this. You could also make the script more universal by adding other element types...

function myFunction() {
  var template = DocsList.getFileById(key);// get the template model
  var newmodelName='testcopy';// define a new name, do what you need here...
  var baseDocId = DocsList.copy(template,newmodelName).getId();// make a copy of firstelement and give it new basedocname build from the serie(to keep margins etc...)
  var baseDoc = DocumentApp.openById(baseDocId);// this is the new doc to modify
  var body = baseDoc.getActiveSection();
  body.appendPageBreak();
  var totalElements = body.getNumChildren();
  for( var j = 0; j < totalElements; ++j ) {
    var element = body.getChild(j).copy();
    var type = element.getType();
    if( type == DocumentApp.ElementType.PARAGRAPH )
      body.appendParagraph(element);
    else if( type == DocumentApp.ElementType.TABLE )
      body.appendTable(element);
    else if( type == DocumentApp.ElementType.LIST_ITEM )
      body.appendListItem(element);
    else if( type == DocumentApp.ElementType.INLINE_IMAGE )
      { var blob = body.getChild(j).asInlineImage().getBlob();
       body.appendImage(blob); }
  }
}

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Edit 2 Thanks to @Fausto, here is a fully working version. Inline images are included in a paragraph so we had to dig one level more to get the blob...

function myFunction() {
  var template = DocsList.getFileById(key);// get the template model
  var newmodelName='testcopy';// define a new name, do what you need here...
  var baseDocId = DocsList.copy(template,newmodelName).getId();// make a copy of firstelement and give it new basedocname build from the serie(to keep margins etc...)
  var baseDoc = DocumentApp.openById(baseDocId);// this is the new doc to modify
  var body = baseDoc.getActiveSection();
  body.appendPageBreak();
  var totalElements = body.getNumChildren();
  for( var j = 0; j < totalElements; ++j ) {
    var element = body.getChild(j).copy();
    var type = element.getType();
    if (type == DocumentApp.ElementType.PARAGRAPH) {
      if (element.asParagraph().getNumChildren() != 0 && element.asParagraph().getChild(0).getType() == DocumentApp.ElementType.INLINE_IMAGE) {
        var blob = element.asParagraph().getChild(0).asInlineImage().getBlob();
        body.appendImage(blob);
      }
      else body.appendParagraph(element.asParagraph());
    }
    else if( type == DocumentApp.ElementType.TABLE )
      body.appendTable(element);
    else if( type == DocumentApp.ElementType.LIST_ITEM )
      body.appendListItem(element);
  }
}