DWObject.LoadImage("C:\\DWT.jpg");

DWObject.IfShowFileDialog = true;
DWObject.LoadImageEx("", EnumDWT_ImageType.IT_ALL);

var imagedata;
DWObject.SelectedImagesCount = 1;
DWObject.SetSelectedImageIndex(0,0);
DWObject.GetSelectedImagesSize(EnumDWT_ImageType.IT_JPG);
imagedata = DWObject.SaveSelectedImagesToBase64Binary();
DWObject.LoadImageFromBase64Binary(imagedata, EnumDWT_ImageType.IT_JPG, function(){
    console.log('success');
    },function(){
    console.log('failure');
});

DWObject.SaveAllAsMultiPageTIFF("C:\\DWT.tiff");

DWObject.SaveAllAsPDF("C:\\DWT.pdf");

//Callback functions for async APIs
function OnSuccess() {
    console.log('successful');
}
function OnFailure(errorCode, errorString) {            
    alert(errorString);
}
function btn_SaveOnClick() {
    if (DWObject.HowManyImagesInBuffer == 0){
        alert("No images in buffer.");
        return;                
    }
    DWObject.SaveAsBMP("D:\\test.bmp", 0, OnSuccess, OnFailure);
}

//Callback functions for async APIs
function OnSuccess() {
    console.log('successful');
}
function OnFailure(errorCode, errorString) {
        alert(errorString);
}
function btn_SaveOnClick() {
    if (DWObject.HowManyImagesInBuffer == 0){
        alert("No images in buffer.");
        return;
    }
    DWObject.SaveAsJPEG("D:\\test.jpg", 0, OnSuccess, OnFailure);
}

//Callback functions for async APIs
function OnSuccess() {
    console.log('successful');
}
function OnFailure(errorCode, errorString) {            
    alert(errorString);
}
function btn_SaveOnClick() {
    if (DWObject.HowManyImagesInBuffer == 0){
        alert("No images in buffer.");
        return;                
    }
    DWObject.SaveAsPDF("D:\\test.pdf", 0, OnSuccess, OnFailure);
}

//Callback functions for async APIs
function OnSuccess() {
    console.log('successful');
}
function OnFailure(errorCode, errorString) {
    alert(errorString);
}        
function btn_SaveOnClick() {
    if (DWObject.HowManyImagesInBuffer == 0){
        alert("No images in buffer.");
        return;
    }
    DWObject.SaveAsPNG("D:\\test.png", 0, OnSuccess, OnFailure);
}

//Callback functions for async APIs
function OnSuccess() {
    console.log('successful');
}
function OnFailure(errorCode, errorString) {            
    alert(errorString);
}
function btn_SaveOnClick() {
    if (DWObject.HowManyImagesInBuffer == 0){
        alert("No images in buffer.");
        return;                
    }
    DWObject.SaveAsTIFF("D:\\test.tif", 0, OnSuccess, OnFailure);
}

DWObject.SelectedImagesCount = 1;
DWObject.SetSelectedImageIndex(0,0);
DWObject.SaveSelectedImagesAsMultiPagePDF("C:\\DWT.pdf");

DWObject.SelectedImagesCount = 1;
DWObject.SetSelectedImageIndex(0,0);
DWObject.SaveSelectedImagesAsMultiPageTIFF("C:\\DWT.tiff");

var imagedata;
DWObject.SelectedImagesCount = 1;
DWObject.SetSelectedImageIndex(0, 0);
DWObject.GetSelectedImagesSize(EnumDWT_ImageType.IT_JPG);
imagedata = DWObject.SaveSelectedImagesToBase64Binary();
newImage.src = "data:image/png;base64," + imagedata;

DWObject.RegisterEvent('OnGetFilePath', function(bSave, filesCount, 
index, path, filename){
    alert(" fileCount: " +  filesCount + " index: " +  index + 
    " path: " +  path + "\\" +  filename);
});
//On macOS
var result = DWObject.ShowFileDialog(false, "TIF,TIFF,JPG,JPEG,PNG,PDF", 0, 
"", "", true, false, 0);
//On Windows
DWObject.ShowFileDialog(false, "BMP,TIF,JPG,PNG,PDF|*.bmp;*.tif;*.png;*.jpg;*.pdf;*.tiff;*.jpeg", 0, 
"", "", true, true, 0);

• boolean bSave: 'true' -- show save file dialog, 'false' -- show open file dialog.
• number filesCount: How many files were selected. 0 means no file was selected or the user closed/cancelled.
• number index: The index of the currently selected file. 0-based. -1 means no file was selected.
• string path: The parent path of currently selected file(s), "\\" is not included. If the methed ShowFileDialog() failed, the initial directory path set in the ShowFileDialog method is returned.
• string filename: The current file name.

DWObject.RegisterEvent('OnGetFilePath', function(bSave, filesCount, 
index, path, filename)
{
    alert("bSave:" + bSave + " fileCount: " +  filesCount + " index: " +  index + 
    " path: " +  path + "\\" +  filename);
});

• string path: the local path of the loaded image. For example, C:\Users\[username]\Downloads\
• string name: the name of the loaded image. For example, image1.jpg
• EnumDWT_ImageType type: Image format.

DWObject.RegisterEvent('OnPostLoad', function(path, name, type) {
    alert(path + '\\' + name);
});