undo() - uncaught exception (-29) error

Question

Hello Experts,

I'm using the InDesign 20.4.1.

Steps to reproduce the issues:

1. Create a master page containing the multiple text frames.
2. Apply the master page to the interior pages (ensure there are at least 5–10 pages).
3. Save the document, close it, and reopen it to clear the history stack.

Here is my script to undo the overridden textframe by the script:

}
}

If there is no undoable data, the process must be routed to catch statement and alert the error message (e).

While running the above script, the attached uncaught exception error occurred.

Note: I couldn't reproduce the same issue in InDesign 19.5.

Thanks in advance.

Regards,
Ashrafali R.

Marc Autret · Accepted Answer

Hi Ashrafali R.

Not sure what you're trying to achieve but playing with doc.undo() is not a good idea unless you have no other option.

In your particular case, it seems that you need to detect, count and/or report text frames according to their ‘overridden’ state relative to the parent (=master) page. Properties like page.masterPageItems, item.overridden and possibly item.overriddenMasterPageItem should be sufficient to safely investigate.

Here is a messy and oversimplified example that illustrates the use of these features:

(function(  doc,pgs,pg,mfs,tfs,i,n,t,s)
//----------------------------------
// Demo: Simple Text Frame Report
// - assuming at most ONE parent page in the hierarchy
// - disregarding grouped/nested frames etc.
{
   doc = app.properties.activeDocument;
   if( !doc ) return;
   
   pgs = doc.pages.everyItem().getElements();
   for( ; pg=pgs.pop() ; )
   {
      // Master frames (not overridden).
      mfs = pg.masterPageItems || [];
      for
      (
         i=mfs.length ; i-- ;
         'TextFrame' != mfs[i].constructor.name
         && mfs.splice(i,1)
      );

      // Local frames (incl. overridden)
      tfs = [];
      n = (t=pg.textFrames).length;
      while( n )
      {
         t = t.everyItem();
         s = t.overridden.join('')
            .replace(/true/g,'1')
            .replace(/false/g,'0');

         if( -1 == s.indexOf('1') ) break;

         for
         (
            tfs=t.getElements(), i=n ;
            i-- ;
            '1' != s.charAt(i) && tfs.splice(i,1)
         );

         break;
      }
      
      // Summary
      s = "Page " + pg.name + "\r" +
         "Overall visible frames: " + (n+mfs.length) + "\r" +
         "----------------------\r\r" +
         "On Master: " + mfs.length + "\r\r" +
         "On Page:   " + n + "\r" +
         " - from master: " + tfs.length + "\r" +
         " - others:      " + (n-tfs.length);
      alert( s );
      
      // At this point,
      // the array `mfs` contains the master (not overridden) frames,
      // the array `tfs` contains the local frames that were overridden.
   }

})();

Best,

M

ashrafali_r_srm · Answer

Hi, Thanks for your response. I do try the suggested way. It override the master textframes but it does not undo its overrides. i.e. It enables all the master textframes. Regards,Ashrafali R.

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