Photoshop Script Import PDF Application.open without dialog

I did not read through  this thread  I create a script  years ago the open a pdf pages in Photoshop It does not have a Script Dialog but does have a system  open  file selection dialog so you can select the PDF to open its pages. I believe it  creates a document with the PDF pages stacked on top of each other. It bypasses the PDF Import dialog. Have not used it in years.

/* ==========================================================
// 2017  John J. McAssey (JJMack) 
// Stack the open Document Visible layer composite into a new 300 DPI document
// This script is supplied as is. It is provided as freeware. 
// The author accepts no liability for any problems arising from its use.
// ======================================================= */
// enable double-clicking from Mac Finder or Windows Explorer
#target photoshop // this command only works in Photoshop CS2 and higher
// bring application forward for double-click events
app.bringToFront();

if (documents.length >= 2) { 
	app.togglePalettes();											// toggle off palettes so Photoshop will not need to update them
	stackpages();												    // Photosho document can be different when oneo via UI
}
else {
	var theFile = File.openDialog("Select your PDF file", "Select:*.pdf");  
	app.displayDialogs = DialogModes.NO;  
	var check = true;  
	var page = 1;  
	// define pdfopenoptions;  
	var pdfOpenOpts = new PDFOpenOptions;  
	pdfOpenOpts.antiAlias = true;  
	pdfOpenOpts.bitsPerChannel = BitsPerChannelType.EIGHT;  
	pdfOpenOpts.cropPage = CropToType.MEDIABOX;  
	pdfOpenOpts.mode = OpenDocumentMode.RGB;  
	pdfOpenOpts.resolution = 300;  
	pdfOpenOpts.suppressWarnings = true;  
	pdfOpenOpts.usePageNumber  = true;  
	app.togglePalettes();											// toggle off palettes so Photoshop will not need to update them
	while (check == true) {  
		try {  
			pdfOpenOpts.page = page;								// open a page at it slower the using Photoshop UI ans selection all the pages you want  
			var thePdf = app.open(theFile, pdfOpenOpts);  
			page++;  
		} 
		catch (e) { check =  false };  
	}; 

	if (documents.length >= 2) { stackpages(); }
	else {
		app.togglePalettes();										// toggle on palettes
		alert("multiple Document are not open in Photoshop");
	}
}	
///////////////////////////////////////////////////////////////////////////////
//                     stack pages function                                  //
///////////////////////////////////////////////////////////////////////////////
function stackpages() {
	var orig_ruler_units = app.preferences.rulerUnits;
	var orig_display_dialogs = app.displayDialogs;
	app.preferences.rulerUnits = Units.PIXELS;						// set the ruler units to PIXELS
	app.displayDialogs = DialogModes.NO;							// Set Dialogs off
	//newFile = theFile.name.substr(0,theFile.name.indexOf(".pdf"));	//New File name
	newFile = app.activeDocument.name.substr(0,app.activeDocument.name.lastIndexOf("-"));	//New File name
	var doc = app.documents.add(app.activeDocument.width.value, app.activeDocument.height.value, app.activeDocument.resolution, newFile, NewDocumentMode.RGB, DocumentFill.TRANSPARENT ); // create a new document
	//for (var i=0;i<documents.length-1;i++) {						// stack a layer for the open document into the new document page 1 on botton	
	for (var i=documents.length-2;i>-1;i--) {						// stack a layer for the open document into the new document page 1 on top
		app.activeDocument = documents[i];							// switch active document
		var layerName = app.activeDocument.name;					// get document name
		app.activeDocument.flatten();								// Flatten remove transparency
		var idDplc = charIDToTypeID( "Dplc" );
		var desc259 = new ActionDescriptor();
		var idnull = charIDToTypeID( "null" );
        var ref24 = new ActionReference();
        var idLyr = charIDToTypeID( "Lyr " );
        var idOrdn = charIDToTypeID( "Ordn" );
        var idTrgt = charIDToTypeID( "Trgt" );
        ref24.putEnumerated( idLyr, idOrdn, idTrgt );
		desc259.putReference( idnull, ref24 );
		var idT = charIDToTypeID( "T   " );
        var ref25 = new ActionReference();
        var idDcmn = charIDToTypeID( "Dcmn" );
        ref25.putName( idDcmn, documents[documents.length-1].name );
		desc259.putReference( idT, ref25 );
		var idNm = charIDToTypeID( "Nm  " );
		desc259.putString( idNm, layerName );
		var idVrsn = charIDToTypeID( "Vrsn" );
		desc259.putInteger( idVrsn, 5 );
		executeAction( idDplc, desc259, DialogModes.NO );			// Copy Layer to document
		app.activeDocument = documents[documents.length-1];			// switch to newly created document
		layerName = layerName.substr(0,layerName.indexOf(".pdf")); 
		app.activeDocument.activeLayer.name=layerName;				// label layer with Document name
	}
	app.activeDocument = documents[documents.length-1];				// switch to newly created document
	var layers = activeDocument.layers;								// get layers
	activeDocument.activeLayer = layers[layers.length-1]			// Target Bottom Layer
	activeDocument.activeLayer.remove();							// Remove original layer
	while  (documents.length>1) {									// close all opened document except the newly created document							
		app.activeDocument = documents[0];		
		activeDocument.close(SaveOptions.DONOTSAVECHANGES);
	}
	app.togglePalettes();											// toggle user's palettes back on	
	app.runMenuItem(charIDToTypeID(("FtOn")));						// fit the document to the screen 
	app.displayDialogs = orig_display_dialogs;						// Reset display dialogs 
	app.preferences.rulerUnits = orig_ruler_units;					// reset units to original settings
}
///////////////////////////////////////////////////////////////////////////////
//                stack open pages function                                  //
///////////////////////////////////////////////////////////////////////////////
function stackopenpages() {
	var orig_ruler_units = app.preferences.rulerUnits;
	var orig_display_dialogs = app.displayDialogs;
	app.preferences.rulerUnits = Units.PIXELS;						// set the ruler units to PIXELS
	app.displayDialogs = DialogModes.NO;							// Set Dialogs off
	//newFile = theFile.name.substr(0,theFile.name.indexOf(".pdf"));	//New File name
	newFile = app.activeDocument.name.substr(0,app.activeDocument.name.lastIndexOf("-"));	//New File name
	var doc = app.documents.add(app.activeDocument.width.value, app.activeDocument.height.value, app.activeDocument.resolution, newFile, NewDocumentMode.RGB, DocumentFill.TRANSPARENT ); // create a new document
	for (var i=0;i<documents.length-1;i++) {						// stack a layer for the open document into the new document page 1 on botton	
	//for (var i=documents.length-2;i>-1;i--) {						// stack a layer for the open document into the new document page 1 on top
		app.activeDocument = documents[i];							// switch active document
		var layerName = app.activeDocument.name;					// get document name
		app.activeDocument.flatten();								// Flatten remove transparency
		var idDplc = charIDToTypeID( "Dplc" );
		var desc259 = new ActionDescriptor();
		var idnull = charIDToTypeID( "null" );
        var ref24 = new ActionReference();
        var idLyr = charIDToTypeID( "Lyr " );
        var idOrdn = charIDToTypeID( "Ordn" );
        var idTrgt = charIDToTypeID( "Trgt" );
        ref24.putEnumerated( idLyr, idOrdn, idTrgt );
		desc259.putReference( idnull, ref24 );
		var idT = charIDToTypeID( "T   " );
        var ref25 = new ActionReference();
        var idDcmn = charIDToTypeID( "Dcmn" );
        ref25.putName( idDcmn, documents[documents.length-1].name );
		desc259.putReference( idT, ref25 );
		var idNm = charIDToTypeID( "Nm  " );
		desc259.putString( idNm, layerName );
		var idVrsn = charIDToTypeID( "Vrsn" );
		desc259.putInteger( idVrsn, 5 );
		executeAction( idDplc, desc259, DialogModes.NO );			// Copy Layer to document
		app.activeDocument = documents[documents.length-1];			// switch to newly created document
		layerName = layerName.substr(0,layerName.indexOf(".pdf")); 
		app.activeDocument.activeLayer.name=layerName;				// label layer with Document name
	}
	app.activeDocument = documents[documents.length-1];				// switch to newly created document
	var layers = activeDocument.layers;								// get layers
	activeDocument.activeLayer = layers[layers.length-1]			// Target Bottom Layer
	activeDocument.activeLayer.remove();							// Remove original layer
	while  (documents.length>1) {									// close all opened document except the newly created document							
		app.activeDocument = documents[0];		
		activeDocument.close(SaveOptions.DONOTSAVECHANGES);
	}
	app.togglePalettes();											// toggle user's palettes back on	
	app.runMenuItem(charIDToTypeID(("FtOn")));						// fit the document to the screen 
	app.displayDialogs = orig_display_dialogs;						// Reset display dialogs 
	app.preferences.rulerUnits = orig_ruler_units;					// reset units to original settings
}

Do your PDFs contain only one page, or are they multi-page documents?

Also, using app.displayDialogs = DialogModes.NO, prevents the dialog, but the PDF is not opened/imported.