Rails - Apr 2006 - AJAX update of <img> element?

Hi,

I''ve been trying to do AJAX updates of an <img> element, but I
can''t seem to make it work.

Should it be possible to do something like this...?

[View]
<%= form_remote_tag :url => {:action => ''sendplot''},
:update => ''plot'' %>
<%= submit_tag %>
<%= end_form_tag %>
<img id="plot" src="someimage.png"/>

[Controller]
def sendplot
 output_plot(...) # this sends a png file to the browser - this bit works
end

I find that the browser (Opera or Firefox), no matter what, won''t
:update an existing <img> tag. If I :update a <div> instead, I see
the png data dumped as ascii, but that isn''t very useful!

Thanks,
Chris.

If you want to replace an image and you''re updating the <div>,
return a
new img tag, not an image file.

unknown wrote:
> I''ve been trying to do AJAX updates of an <img> element, but
I can''t
> seem to make it work.
> 
> Should it be possible to do something like this...?
> 
> [View]
> <%= form_remote_tag :url => {:action =>
''sendplot''}, :update => ''plot''
> %>
> <%= submit_tag %>
> <%= end_form_tag %>
> <img id="plot" src="someimage.png"/>
> 
> [Controller]
> def sendplot
>  output_plot(...) # this sends a png file to the browser - this bit 
> works
> end
> 
> I find that the browser (Opera or Firefox), no matter what, won''t 
> :update an existing <img> tag. If I :update a <div> instead, I
see the
> png data dumped as ascii, but that isn''t very useful!
-- 
Posted via http://www.ruby-forum.com/.

Thanks, that''s what I ended up doing, essentially.

It eventually dawned on me that an <img> element has no .value, like a
div does, so trying to give it new data was pointless. 

I ended up having to add another controller action to, as you say,
replace the div contents with a new img tag, rather than the contents of
the existing img.

Chris.
> 
> If you want to replace an image and you''re updating the 
> <div>, return a new img tag, not an image file.
> 
> unknown wrote:
> > I''ve been trying to do AJAX updates of an <img>
element, but I can''t
> > seem to make it work.
> > 
> > Should it be possible to do something like this...?
> > 
> > [View]
> > <%= form_remote_tag :url => {:action =>
''sendplot''},
> :update => ''plot''
> > %>
> > <%= submit_tag %>
> > <%= end_form_tag %>
> > <img id="plot" src="someimage.png"/>
> > 
> > [Controller]
> > def sendplot
> >  output_plot(...) # this sends a png file to the browser - this bit
> > works
> > end
> > 
> > I find that the browser (Opera or Firefox), no matter what,
won''t
> > :update an existing <img> tag. If I :update a <div> 
> instead, I see the 
> > png data dumped as ascii, but that isn''t very useful!
> 
> -- 
> Posted via http://www.ruby-forum.com/. 
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