Get the index of the current page?

[Stamm]

Hello, I can't figure out, how to get the index of the active Page in a document. I can't use "activePage.name", as the name can not show the actual number of the current page. In the forums I found the following function to get javascripts indexOf() function.

if (!Array.prototype.indexOf) { 

    Array.prototype.indexOf = function (searchElement /*, fromIndex */ ) {   

        "use strict"; 

        if (this == null) { 

            throw new TypeError(); 

        } 

        var t = Object(this); 

        var len = t.length >>> 0; 

        if (len === 0) { 

            return -1; 

        } 

        var n = 0; 

        if (arguments.length > 0) { 

            n = Number(arguments[1]); 

            if (n != n) { // shortcut for verifying if it's NaN 

                n = 0; 

            } else if (n != 0 && n != Infinity && n != -Infinity) { 

                n = (n > 0 || -1) * Math.floor(Math.abs(n)); 

            } 

        } 

        if (n >= len) { 

            return -1; 

        } 

        var k = n >= 0 ? n : Math.max(len - Math.abs(n), 0); 

        for (; k < len; k++) { 

            if (k in t && t === searchElement) { 

                return k; 

            } 

        } 

        return -1; 

    } 

} 

With this I wrote then the following code:

var myDocument = app.activeDocument;

var myPages = myDocument.pages;

var number = myPages.indexOf(myDocument.layoutWindows[0].activePage);

It sadly doesn't work. When I alert "myPages" I can see, that I get the pages object. Can I know somehow get just the array with the values of this?

Thank you in advance!! Appreciate any help!

[Harbs.]

You are confusing arrays and collections Document.pages is a collection. If you want to resolve that into an array, you need myCollection.getElements(). In your case that would be myDocument.pages.getElements();

I usually use a convenience function to get items as an array when I want to work with arrays:

It also returns a copy of the array if an array is provided:

AsArray = function (collection){
  if(collection instanceof Array){return collection.slice()}
  return collection.everyItem().getElements().slice();
}

(The slice on the collection is to improve performance in older versions of InDesign...)

[Stamm]

Hey, thanks for the help, I think Peters solution is a bit quicker here

[Peter Kahrel]

Anyway, in answer to the OP's question : )

This returns the active page's index:

app.windows[0].activePage.index

Peter

[cchimi]

Is it definitely the index that you want? That returns the index of the page within the containing object, which is the Spread, so it's usually just 0 or 1.

If you actually want the number of the page within the document (disregarding section pagination options) you want documentOffset. So, you could use

app.activeWindow[0].activePage.documentOffset.

If you have a 10 page document with two roman-numeral pages and then numbered pages restarting at 1 (i, ii, 1, 2, 3, 4, 5, 6, 7, 8), that will give you a value of 1 for the first page and 10 for the last (as opposed to .name which gives 'i' for the first and '8' for the last).

[Peter Kahrel · Accepted solution]

app.activeWindow[0].activePage.documentOffset

Of course, documentOffset, not index. Thanks for noticing that.

[Stamm]

Hey, thank you really much!!! Don't know how I could not find this solution .

[rudiwarttmann]

And without the "[0]", it finally works correctly, like this:

app.activeWindow.activePage.documentOffset

To get the "nth" page in the document, I use, hence:

var myPage = Number(app.activeWindow.activePage.documentOffset) + 1;

[Peter Kahrel]

Ah, yes, I mixed up app.activeWindow and app.windows[0].

[Jongware]

Correct, but the first page starts at 0, not 1:

alert (app.activeDocument.pages[0].documentOffset);

[Stamm]

That's true. It's actually quite handy for what I am doing, as I am using the active Page value in an array for xml elements. So for example site[activePage] is doing the right effect for me, as before I had to do 'index = activePage - 1;' . For most other purposes, you would of course have to use app.activeDocument.pages[0].documentOffset +1