InDesign script that generates percentages as page numbers

Question

Does anybody know of a script that could calculate percentages within an InDesign document? To clarify - I want to use this essentially as a page number: page 5 of 10 would be 50%, for example.

If no script exists, which I'm thinking might happen as this is a pretty niche request, does anyone have any suggestions as to how to do this that's not completely manual? This document is going to be pretty large, so I'm not sure if doing them by hand will be an option. Thanks in advance!

Answer 1

Not gonna lie... I spent way too much time on this, but here we are...

This should be close enough (Instructions at the top of the script):

// Version.1.0.
// Page Numbers To Percentages.jsx
// https://gist.github.com/joonaspaakko/6628e2b6252d622b1b7f7eba601f6c91

// You may want to save before running the script. Every single
// time you run the script, all text frames that are inside a
// master page or nested master pages will be torn out (overridden).

// The script assumes the starting point is this:
// 1. You have a designated layer for the page numbers (Layer name defined below↓).
// 2. The layer should only contain one empty textframe per page. The text frame could contain text too, but it will be overweritten so it doesn't really matter.
//    - The text frame can be inside a master page or a regular page.


var layerName = "Page Numbers";
var basedOn = 1; // 0 = Puts back the current page number, 1 = The numbered pages, 2 = All pages
var percentage_prefix = '';
var percentage_suffix = '%';

if ( app.documents.length > 0 ) {

    var doc = app.activeDocument;
    var targetLayer = null;
    var layer = doc.layers.itemByName( layerName );
    var numberItems = prepareNumberOverride( doc, layer );
    replacePageNumbers( layer, numberItems );

}


function prepareNumberOverride( doc, layer ) {

    var collect_items = [];

    for ( var pageIndex=0; pageIndex < doc.pages.length; pageIndex++ ) {

        var page = doc.pages[pageIndex];
        var nPageItems = page.textFrames;
        var mPageItems = page.masterPageItems;


        var pageItemAdded = false;
        for ( var nPageItemIndex=0; nPageItemIndex < nPageItems.length; nPageItemIndex++ ) {
            var textFrame = nPageItems[ nPageItemIndex ];
            if ( textFrame.itemLayer == layer ) {
                collect_items.push( textFrame );
                pageItemAdded = true;
            }
        }

        if ( !pageItemAdded ) {
            for ( var mPageItemIndex=0; mPageItemIndex < mPageItems.length; mPageItemIndex++ ) {

                var item = mPageItems[ mPageItemIndex ];
                if ( item.itemLayer === layer ) {

                    var text = item.contents;

                    item.allowOverrides = true;
                    if ( item.allowOverrides == true ) {
                        var newItem = item.override( page );
                        collect_items.push( newItem );
                    }

                }

            }
        }

    }

    return collect_items;

}

function replacePageNumbers( layer, numberItems ) {

    var numberItemsLength = numberItems.length;

    for ( var i=0; i < numberItems.length; i++ ) {

        var numberItem = numberItems[i];
        var currentPageNumber = numberItem.parentPage.name;

        // Based on all number pages...
        if ( basedOn == 1 ) {
            var percentage = Math.floor( ((i+1) / numberItemsLength) * 100 );
        }
        // Based on all pages...
        else if ( basedOn == 2 ) {
            var percentage = Math.floor( (currentPageNumber / app.activeDocument.pages.length) * 100 );
        }

        numberItem.contents = basedOn == 0 ? currentPageNumber : percentage_prefix + percentage + percentage_suffix;

    }

}