ZK Developer's Guide

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Chapter 4
{
Object media = Fileupload.get();
if (media instanceof org.zkoss.image.Image)
{
org.zkoss.image.Image img =
(org.zkoss.image.Image) media;
image.setContent(img);
imagegrid.setWidth(""+(img.getWidth()+10)+"px");
}
else if (media != null)
Messagebox.show("Not an image: "+media, "Error",
Messagebox.OK, Messagebox.ERROR);
}