Import and Export

Annotation

The Annotation supports three types of files to import/export data: XFDF, FDF and JSON. The following table lists what annotations currently support or not support to import/export.

File Type	If all annots support	What not support
XFDF/FDF	Mostly	Screen Image, Link, Sound
JSON	Mostly	Screen Image, Link, Sound

API

The following table list methods that can be used to import/export from/to data file.

Method	XFDF/FDF	JSON	JSON
Import	PDFDoc.importAnnotsFromFDF()	PDFDoc.importAnnotsFromJSON(annotsJson)	PDFPage.addAnnot(annotJson)
Export	PDFDoc.exportAnnotsToFDF()	PDFDoc.exportAnnotsToJSON()	Annot.exportToJson()

It is recommended to use a corresponding method to import and export data. For example, If PDFDoc.exportAnnotsToJSON() is called to export data, then it would better the PDFDoc.importAnnotsFromJSON(annotsJson)is used to import.

Note: Adding exported JSON data to the document via the PDFPage.addAnnot method can lead to loss of binary data streams for some annotations, such as Stamp and fileAttachment. This is because the PDFPage.addAnnot method does not support JSON data that contains binary streams. Therefore, if the data exported by PDFDoc.exportAnnotsToJSON contains binary streams, then it cannot be passed to the PDFPage.addAnnot method.

var pdfViewer = await pdfui.getPDFViewer();
var test = {ExportDataFile:'http://pathToSourceFile.pdf',ImportDatafile:'http://pathToTargetFile.pdf'};
var resp = await fetch(test.ExportDataFile);
var file = await resp.blob();

var pdfdoc = await pdfViewer.openPDFByFile(file);
var annotJson = await pdfdoc.exportAnnotsToJSON();
var newResp = await fetch(test.ImportDatafile);
var newFile = await newResp.blob()

var newPdfdoc = await pdfViewer.openPDFByFile(newFile);
for(var i=0;i<annotJson.length;i++){
    var newPage = await newPdfdoc.getPageByIndex(annotJson[i].page);
    var newAnnot = await newPage.addAnnot(annotJson[i]);
}

Form

The Form supports five standard types of files to import/export data: XFDF, FDF, XML, CSV and Txt.

API

The following table list APIs that Foxit PDF SDK for Web provides to import/export data file.

• PDFDoc.exportFormToFile()
• PDFDoc.importFormFromFile()