Rails - Oct 2006 - Browser caching creating problems while updating an image on browser using Ajax

Hi,

On one of the views I display an image "some_week.jpg", which
basically
displays a graph for data corresponding to a particular week, by default
current week.
Following is the code snippet in view which displays an image,
<div id="image_place_holder">
    <img src=''/pictures/1/some_week.jpg''>
</div>

On this view, User has an option of selecting some other week and see the
graph corresponding to it. I have implemented this using an AJAX call where
the graph image is constucted using Gruff library on server side and
following response is sent back from RJS,
imageTag ="<img
src=''/pictures/#{session[:user_id]}/#{@picName}''>"
page.replace_html ,"image_place_holder", imageTag

where, session[:user_id] =1 and @picName = "some_week.jpg"

After the response the image in the browser is still the old image, I
verified on server, the new image is created in the mentioned directory but
browser seem to cache the old image.

I am using Mozilla Firefox 1.5.0.7.

Help is appreciated.



Regards,

Jatinder


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Timestamp the image.

image_tag should do this automatically (if you put your image in
public/images):

image_tag(''some_week.jpg") or you can do
<img src="/pictures/1/some_week.jpg?<%= Time.now %>" />

The first is more elegant in that it tracks date modified time of the file
to generate the asset timestamp.

Later,
Vish

On 10/25/06, Jatinder Singh
<jatinder.saundh-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
>
> Hi,
>
> On one of the views I display an image "some_week.jpg", which
basically
> displays a graph for data corresponding to a particular week, by default
> current week.
> Following is the code snippet in view which displays an image,
> <div id="image_place_holder">
>     <img src=''/pictures/1/some_week.jpg''>
> </div>
>
> On this view, User has an option of selecting some other week and see the
> graph corresponding to it. I have implemented this using an AJAX call where
> the graph image is constucted using Gruff library on server side and
> following response is sent back from RJS,
> imageTag ="<img
src=''/pictures/#{session[:user_id]}/#{@picName}''>"
> page.replace_html ,"image_place_holder", imageTag
>
> where, session[:user_id] =1 and @picName = "some_week.jpg"
>
> After the response the image in the browser is still the old image, I
> verified on server, the new image is created in the mentioned directory but
> browser seem to cache the old image.
>
> I am using Mozilla Firefox 1.5.0.7.
>
> Help is appreciated.
>
>
>
> Regards,
>
> Jatinder
>
> >
>

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Thanks Vishnu, now it works!


Regards,
Jatinder


On 10/25/06, Vishnu Gopal
<g.vishnu-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
>
> Timestamp the image.
>
> image_tag should do this automatically (if you put your image in
> public/images):
>
> image_tag(''some_week.jpg") or you can do
> <img src="/pictures/1/some_week.jpg?<%= Time.now %>"
/>
>
> The first is more elegant in that it tracks date modified time of the file
> to generate the asset timestamp.
>
> Later,
> Vish
>
> On 10/25/06, Jatinder Singh
<jatinder.saundh-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> >
> > Hi,
> >
> > On one of the views I display an image "some_week.jpg",
which basically
> > displays a graph for data corresponding to a particular week, by
default
> > current week.
> > Following is the code snippet in view which displays an image,
> > <div id="image_place_holder">
> >     <img src=''/pictures/1/some_week.jpg''>
> > </div>
> >
> > On this view, User has an option of selecting some other week and see
> > the graph corresponding to it. I have implemented this using an AJAX
call
> > where the graph image is constucted using Gruff library on server side
and
> > following response is sent back from RJS,
> > imageTag ="<img
src=''/pictures/#{session[:user_id]}/#{@picName}''>"
> > page.replace_html ,"image_place_holder", imageTag
> >
> > where, session[:user_id] =1 and @picName = "some_week.jpg"
> >
> > After the response the image in the browser is still the old image, I
> > verified on server, the new image is created in the mentioned
directory but
> > browser seem to cache the old image.
> >
> > I am using Mozilla Firefox 1.5.0.7.
> >
> > Help is appreciated.
> >
> >
> >
> > Regards,
> >
> > Jatinder
> >
> >
> >
>
> >
>

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