No, don't do that. It's better to use the last-modified timestamp of
the image file. Just extend your RPC method to return the mtime when
you request the width and the height.
Sorry, I should've explained why this "trick" works. The browser
caches the image with its full URL including the query string. When
you set the query string to a random value the browser can't use the
cached version because its URL is different, in your case, 99.5% of
the time. It's also possible, and very likely, that the browser will
show an older version of the image.
On 8 Sep., 10:50, Paul van Hoven <[EMAIL PROTECTED]>
wrote:
> Great, this simple trick really works. Thanks a lot.
>
> I implemented it in the following way:
>
> Image userPicture = new Image( GWT.getHostPageBaseURL() +
> umi.userPic.thumbPath + "?" + Random.nextInt(200));
>
> On Sep 8, 12:04 am, Folke <[EMAIL PROTECTED]> wrote:
>
> > Append a unique ID as query string of the image URL, i.e. the time the
> > file was last modified as integer.
>
> > /upload/images/12345.jpg?1220824911
>
> > On Sep 7, 11:34 pm, Paul van Hoven <[EMAIL PROTECTED]>
> > wrote:
>
> > > I have a simple Widget where the user can set its user picture. It has
> > > a fileupload and shows the user image. So when the user wants to
> > > change his user picture, he simply clicks on the fileupload chooses
> > > picture and this is then send to the server. On the server side the
> > > picture is safed as "userId".jpg where userId is a unique integer
> > > associated with each user. So everytime the user updates his foto, his
> > > file named "userId".jpg is simply overwritten, keeps its name and
> > > after the fileupload succeeded on the client side in the "public void
> > > onSubmitComplete(FormSubmitCompleteEvent event)" method I make an RPC
> > > call to the server to retrieve the new image data, such that the user
> > > can see his newly changed picture. But there is a problem.
>
> > > The image in the widget is constructed by
>
> > > setupWidget() {
> > > ....
> > > Image userPicture = new Image( GWT.getHostPageBaseURL() +
> > > umi.userPic.thumbPath );
> > > userPicture.setPixelSize( umi.userPic.width, umi.userPic.height );
> > > ...
>
> > > }
>
> > > So after having gotten the new image data from the server the method
> > > setupWidget() is called andthe new picture gets the same path as the
> > > old one was, since the "userId".jpg hasn't changed name but content.
> > > The problem: The new image is not reloaded, i.e. the same image as the
> > > old one is shown. But the size of the picture changes. So now I have
> > > the old picture but poorly scaled. I've already tried not to create a
> > > new image but to call "setURL()" on the "old" userpicture. But it
> > > doesn't work either.
>
> > > Why is the image not reloaded properly?
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