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Where to include a web components css file when integrating a third party w by Martin Vyšný, 1 week ago
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Vaadin Forum3. Vaadin 6, 7, 8

Drag and Drop Upload File later

Johannes Meßmer
5 years ago Apr 25, 2016 1:18pm

Hi guys,

I want to upload a pdf with Drag and Drop. When I use the DragAndDropWrapper, the file is uploaded immediatly. Is there a way to invoke the upload later ? like a ClickEvent ?

 

Matti Tahvonen
5 years ago Apr 27, 2016 2:14pm

Most browsers suppor dragging files on top of <input type="file">, so I guess you could use a normal upload component in non-immediate mode and some CSS to make it look like a "dropzone". The trigger the upload from a normal button click listener.

From usability POV, I'd really suggest to let the upload just start right away. It just doesn't make sense to make your users wait for the upload to happen, any more than required. If you want to save some memory, just stream it to a file and use from to server side when you actually need it.

cheers,
matti