Unique file names

My solution, but not free. There is a 30-day trial.

https://www.marspremedia.com/software/indesign/export-named-pages

Hey Thanks for this script and explenation.
I've run though all the steps but I get an error when running the script. I'm new to this and don't know what to do with this error. 
Error number: 8
Error string: Syntax error
Line: 1
Source: {\rtf1\ansi\ansicpg1252\cocoart2759
Offending Text: \

Hello Dano,

If you have data in your master.xls that you can also have as part of your merge process see the steps below....

1. Start off by creating a Paragraph style named "PDF_name"

2. Create a text box in the slug area with a portion of the box within the page bounds and assign the Paragraph style "PDF_name"

3. Assign the field from the data source for the pdf naming

4. Create and save the Merged document, run the script to export the pdfs

The below script will export pdfs named by the contents of the text box useing the Paragraph style named "PDF_name from each page

var doc = app.documents[0];
   var myResult = {};
   var allStoriesArray = app.documents[0].stories.everyItem().getElements();
   
    for(var n=0; n<allStoriesArray.length; n++){
    var currentStory =  allStoriesArray[n];
    var textContainersLength = currentStory.textContainers.length;
    var lastFrameOfStory = currentStory.textContainers[textContainersLength-1];
    var objToCheck = lastFrameOfStory;
    
    if(lastFrameOfStory.constructor.name == "TextPath")
    objToCheck = lastFrameOfStory.parent
    
    if(currentStory.overflows && objToCheck.itemLayer.visible && objToCheck.parentPage != null)
    myResult[objToCheck.parentPage.name] = objToCheck.parentPage.name;
    }
    
    var pageList = new Array;
    for(var a in myResult)
    pageList.push(a);
        
    pageList.sort(function(a,b) {return a-b});
    
    if(pageList.length > 0){
    alert("Error!\nDocument contains overset text on page(s): \r" + pageList);
    exit();
    }
    
   var mLinks = doc.links; 
   for(var i = 0; i < mLinks.length; i++){ 
   if ((mLinks[i].status == LinkStatus.LINK_MISSING || mLinks[i].status == LinkStatus.LINK_OUT_OF_DATE) && checkIfOnPage(mLinks[i].parent.parent) && mLinks[i].parent.parent.itemLayer.visible == true ){ 
   alert("Error!\nThis document contains links to files that are missing or modified, use the links panel to fix the problem(s) and try again!");  
   exit();
     
          }
     }

function checkIfOnPage(mItem){
    
    var _OldZeroPoint = app.activeDocument.zeroPoint;     
    app.activeDocument.zeroPoint = [0,0];     
    var _Width =app.activeDocument.documentPreferences.pageWidth;     
    var _Height=app.activeDocument.documentPreferences.pageHeight;     
    var _Bounds = mItem.geometricBounds;
    if ((_Bounds[3] < 0)  || (_Bounds[1] > _Width) || (_Bounds[0] > _Height) || (_Bounds[2] < 0)){
        return false     
    }else{   
        return true 
    }
    app.activeDocument.zeroPoint =_OldZeroPoint;     
}

    function myGetPageNames(){
        var myPageNames = new Array;
        for(myCounter = 0; myCounter < app.activeDocument.pages.length; myCounter ++){
            myPageNames.push(app.activeDocument.pages.item(myCounter).name);
      }
        return myPageNames;
    }

       //Function Returns pdf_name for Selected Pages
      function getTextFromPageUsingParagraphStyle(myPage){
     
     if (doc.paragraphStyles.itemByName("PDF_name") == null) {
      alert ('Error!\nThe Paragraph Style "PDF_name" does not exist or is Labeled Incorrectly.');
      exit();
}
          app.findTextPreferences = app.changeTextPreferences = null;   
          app.findTextPreferences.appliedParagraphStyle = "PDF_name";  
  
          var myTextframes = myPage.textFrames;  
          var pdf_name = null;
          
          for (y=0; y < myTextframes.length; y++){
            try {
              var mySearchResult = myTextframes[y].findText();
                if (mySearchResult.length > 0){  
                 pdf_name = mySearchResult[0].contents; 
                   break;  
                  }
             }catch (e){
        }
            } 
  
           return pdf_name;      
  } 

//Dialog/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

var mySelectedFolder = Folder.selectDialog ("Select a Folder");
if(mySelectedFolder != null){

}else{
exit();
}

var myDialog = app.dialogs.add({name:"DataMerge 1-Page HR Pdf Exporter", canCancel:true});
with (myDialog){
with (dialogColumns.add()){

with (dialogRows.add())
staticTexts.add({staticLabel:"Page Range Options", minWidth:25});
with (borderPanels.add()){
var myradiogroup1 = radiobuttonGroups.add();
with (myradiogroup1){
var myyesradiobutton1 = radiobuttonControls.add({staticLabel:'Export All Pages', checkedState:true});
var mynoradiobutton1 = radiobuttonControls.add({staticLabel:'Export Select Pages'});    
staticTexts.add({staticLabel:"", minWidth:75});  
}
}
}
}
if (myDialog.show() == true){

var SelectedPages = myradiogroup1.selectedButton; 

}else{
}
myDialog.destroy();

//All Pages//////////////////////////////////////////////////////////////////////////////////////////////////

 if (SelectedPages == false){
     
for(var p = 0; p < app.documents[0].pages.length; p++) {  
         var frames = app.documents[0].pages[p].textFrames;  
         var pdf_name = null;  
      
         for(var i = 0; i < frames.length; i++) { 
          try { 
              if(frames[i].paragraphs[0].appliedParagraphStyle.name == 'PDF_name') {  
                   pdf_name = frames[i].paragraphs[0].contents;  
                   break;  
              }
            }catch (e){
          }  
        }
     
    if (pdf_name == null) { 
    alert ('Error!\nThe Paragraph Style "pdf_name" is not applied to one or more of the pages or is Labeled Incorrectly.');
    exit();
    }
      
      if(pdf_name != null) {  
 
    }    

         app.pdfExportPreferences.pageRange = app.documents[0].pages[p].name; 

         var export_preset = app.pdfExportPresets.item("[High Quality Print]");
         
         doc.exportFile(ExportFormat.PDF_TYPE, File(mySelectedFolder +"/"+ pdf_name + ".pdf"), false, export_preset);
  }
  alert("Done Exporting Pdf's!");
}

//Selected Pages/////////////////////////////////////////////////////////////////////////////////////////////

 if (SelectedPages == true){
     
     for(var p = 0; p < app.documents[0].pages.length; p++) {  
         var frames = app.documents[0].pages[p].textFrames;  
         var pdf_name = null;  
      
         for(var i = 0; i < frames.length; i++) { 
          try { 
              if(frames[i].paragraphs[0].appliedParagraphStyle.name == 'PDF_name') {  
                   pdf_name = frames[i].paragraphs[0].contents;  
                   break;  
              }
            }catch (e){
          }  
        }
     
     if (pdf_name == null) { 
    alert ('Error!\nThe Paragraph Style "PDF_name" is not applied to one or more of the pages or is Labeled Incorrectly.');
    exit();
      }
      if(!pdf_name) continue;
      }
  
   var myPageNames = myGetPageNames();

    var selectPgs = new Window ("dialog", "Select Page#'s To Export");
    var pgGroup = selectPgs.add("group");
    pgGroup.orientation = "column";
    pgGroup.alignChildren = "center";
    pgGroup.add("statictext", undefined, "Export Single Page pdf's");
    var pgsList = pgGroup.add("listbox", [-25, 0, 170, 246], myPageNames, {multiselect: true});
    var selectedpgsList = []; 
    for (var i = 0; i < pgsList.items.length; i++){selectedpgsList[-1] = pgsList.items[i];}
    pgsList.selection = selectedpgsList; 

    var btn = selectPgs.add("group");
    btn.orientation = "row";
    btn.alignment = ["right", "top"];
    var okBtn = btn.add ("button", undefined, "OK", {name:"OK"});
    var cancelBtn = btn.add ("button", undefined, "Cancel", {name:"Cancel"});

    var result = selectPgs.show();
    if(result == 1){
    }  
    else if (result== 2){  
    exit(0);  
    } 
    var pagelist = [];
    if(pgsList.selection == null){
     alert ("Error!\nNo page#'s were selected.")
     exit(); 
     }else{
         
      for (var i=0; i<pgsList.selection.length; i++) {
      pagelist.push(pgsList.selection[i].text);
        }
     }
 
          for (i = 0; i < doc.pages.length; i++) {
            if (String(pagelist).match("\\b"+doc.pages[i].name+"\\b")){ 

            var pdf_name = getTextFromPageUsingParagraphStyle(doc.pages[i]);
          
            app.pdfExportPreferences.pageRange = doc.pages[i].name;
           
            var export_preset = app.pdfExportPresets.item("[High Quality Print]");

           doc.exportFile(ExportFormat.PDF_TYPE, File(mySelectedFolder +"/"+ pdf_name + ".pdf"), false, export_preset);
         }
      }
      alert("Done Exporting Pdf's!");
    }

Regards,

Mike