DataTransfer getData

[Ronit]

Hello Team,

I am new to GWT and working on an existing code. I am trying to implement a drag and drop functionality .I am having issues getting data from DataTransfer object. I need to drag and drop any file from the computer on the widget.

 grid.addDropHandler(new DropHandler() {
            @Override
            public void onDrop(DropEvent event) {
                event.preventDefault();

                DataTransfer dataTransfer = event.getNativeEvent().getDataTransfer();

                dataTransfer.setDropEffect(DropEffect.COPY);

                Object data = dataTransfer.getData("File");

             }
        });

I am getting an empty-string on  dataTransfer.getData("file")'

How can we set the format "File" while doing dataTransfer.setData();

I think I am doing something wrong here . Please advice. 

Thank you

Ronit

[Thomas Broyer]

AFAICT, this is not how you handle file drops: https://developer.mozilla.org/en-US/docs/Web/API/HTML_Drag_and_Drop_API/File_drag_and_drop

and GWT's drag and drop API doesn't support what's needed here. You'd have to use Elemental2 (com.google.elemental2:elemental2-dom) which should have everything.