Enhanced Bookmark Navigation: Direct Linking to Specific Text within PDF Pages

Aspose.PDF Product Family
1

We have a use case where we need to map bookmarks to the page numbers where the corresponding text can be found. Our current code allows us to navigate to the exact page number, but it doesn’t precisely locate the text associated with the bookmark. We want to enhance this feature so that when a user clicks on a bookmark or outline item, they are taken not only to the correct page but also directly to the specific text the bookmark refers to.

static String addHighlightsToPDF(String pdfPath,String JsonPath) {

    String fullPath="/tmp/output_aspose.pdf";
    try {
        com.aspose.pdf.Document pdfDocument = new com.aspose.pdf.Document("/tmp/"+pdfPath);

        // Delete all bookmarks
        pdfDocument.getOutlines().delete();

        // Iterate through the pages
        for(Page singlePage : pdfDocument.getPages())
        {
            // Iterate through the annotations
            for(Annotation singleAnnot : singlePage.getAnnotations())
            {
                singlePage.getAnnotations().delete(singleAnnot);
            }
        }

        FileReader reader = new FileReader("/tmp/"+JsonPath);
        JSONTokener tokener = new JSONTokener(reader);
        JSONObject object = new JSONObject(tokener);
        JSONArray keys = object.names ();

        JSONArray jsonArray = object.getJSONArray("text_reference");  
            // Iterate jsonArray using for loop   
            for (int i = 0; i < jsonArray.length(); i++) {  

                OutlineItemCollection pdfOutline = new OutlineItemCollection(pdfDocument.getOutlines());
                JSONObject explrObject = jsonArray.getJSONObject(i);  
                if(!explrObject.isNull("reference_text") && !explrObject.isNull("reference_page")){
                    
                    // Split the paragraph into words.
                    String[] words = ((String) explrObject.get("reference_text")).split(" ");
                    String comment = words.toString();
                    if(words.length>6){
                        // Get the first three words.
                        String[] firstThreeWords = Arrays.copyOfRange(words, 0, 3);

                        // Get the last three words.
                        String[] lastThreeWords = Arrays.copyOfRange(words, words.length - 3, words.length);

                        comment=String.join(" ",firstThreeWords)+" ... "+String.join(" ",lastThreeWords);
                    }

                    pdfOutline.setTitle("REF_BIN_"+(String) explrObject.get("id")+"_"+comment);
                    pdfOutline.setAction(new GoToAction(pdfDocument.getPages().get_Item(Integer.parseInt((String) explrObject.get("reference_page")))));
    
                    // Add a bookmark in the document's outline collection.
                    // not adding outline to avoid bookmarks mismatch problem
                    pdfDocument.getOutlines().add(pdfOutline);

...
2

@cacglo
We are looking into it and will be sharing our feedback with you shortly.

4

@cacglo

In order to jump to specific word or phrase inside a Page via bookmark, you need to define the XYZExplicitDestination for the GotoAction like below:

// XYZExplicitDestination(pageNumber, left, top, zoom)
action.setDestination(new XYZExplicitDestination(1, 0, 10, 0));
5

Where should I add the code snippet you shared in my code?

6

@cacglo

You can please get action of the bookmark and use the suggested method with the desired position of the text. The method can be used below above line of the code.