Asp Forum - How to refresh Image through ajax request

Kumar Saurav

1/16/2009 3:26:00 PM

Hi all ,
I am very new for ruby. I am using Ajax Request(Rmagick in controller)
for changing image on my DIV but the problem is it refresh for first
time only then after i have to refresh the browser always. If anybody
having any solution, Please let me know . I am posting my code here

Code in rhtml file
==================================================================================
<%= form_remote_tag({:url=>{:controller=>'image_builders', :action
=>'index'}, :update =>'photo'})%>
<dl style="width:450px">
<dt>Type</dt>


</dl>
<%= submit_tag 'Create Image' %>
</div>



<div>
<label><b>Image:</b></label>

<div id="photo" style="width:99%;">

</div>
</div>



===============================================================================
code in controller

def index
@Rows =20
@Cols = 120
@alpha = params[:alpha].to_i
@margin = params[:margin].to_i
if params[:height].to_i >9000 || params[:width].to_i > 9000
if params[:height].to_i >9000
params[:height] = 8999
end
if params[:width].to_i > 9000
params[:width] = 8999
end
end
if params[:height] && params[:width]
@Rows =params[:height].to_i
@Cols = params[:width].to_i
end
@Start = params[:input_field_1]
@End = params[:input_field_2]
if params[:type] == 'gradation'
fill = Magick::GradientFill.new(0, 0, 0, @Cols, @Start, @End)
img = Magick::Image.new(@Rows, @Cols, fill)
img.opacity = @alpha/ 127.0 * Magick::TransparentOpacity if
@alpha != 0
img_new = img.rotate(90)
if params[:reverse]
img_rev = img_new.rotate(270)
img_rev.write("public/images/xyz.jpg")
render :text => "<img src='/images/xyz.jpg' />"
else
img_new.write("public/images/xyz.jpg")
render :text => "<img src='/images/xyz.jpg' />"
end
end
end
================================================================================
--
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12 Answers

Ryan Davis

1/17/2009 6:27:00 AM

On Jan 16, 2009, at 07:25 , Kumar Saurav wrote:

> I am very new for ruby. I am using Ajax Request(Rmagick in controller)
> for changing image on my DIV but the problem is it refresh for first
> time only then after i have to refresh the browser always. If anybody
> having any solution, Please let me know . I am posting my code here

pls ask these q's in the rubyonrails forums/lists.

Kumar Saurav

1/17/2009 7:30:00 AM

Ryan Davis wrote:
> On Jan 16, 2009, at 07:25 , Kumar Saurav wrote:
>
>> I am very new for ruby. I am using Ajax Request(Rmagick in controller)
>> for changing image on my DIV but the problem is it refresh for first
>> time only then after i have to refresh the browser always. If anybody
>> having any solution, Please let me know . I am posting my code here
>
> pls ask these q's in the rubyonrails forums/lists.

I don't have access of that forum due to lost of the password and i
think it belongs to this forum also so i put it here.
Thanks
--
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Kumar Saurav

1/17/2009 7:34:00 AM

Kumar Saurav wrote:
> Ryan Davis wrote:
>> On Jan 16, 2009, at 07:25 , Kumar Saurav wrote:
>>
>>> I am very new for ruby. I am using Ajax Request(Rmagick in controller)
>>> for changing image on my DIV but the problem is it refresh for first
>>> time only then after i have to refresh the browser always. If anybody
>>> having any solution, Please let me know . I am posting my code here
>>
>> pls ask these q's in the rubyonrails forums/lists.
>
> I don't have access of that forum due to lost of the password and i
> think it belongs to this forum also so i put it here.
> Thanks

Sorry i misunderstood.

Thanks for the suggestion
--
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AGoofin

1/17/2009 3:38:00 PM

On Jan 17, 2:33 am, Kumar Saurav <sau...@cipher-tech.com> wrote:
> Kumar Saurav wrote:
> > Ryan Davis wrote:
> >> On Jan 16, 2009, at 07:25 , Kumar Saurav wrote:
>
> >>> I am very new for ruby. I am using Ajax Request(Rmagick in controller)
> >>> for changing image on my DIV but the problem is it refresh for first
> >>> time only then after i have to refresh the browser always. If anybody
> >>> having any solution, Please let me know . I am posting my code here
>
> >> pls ask these q's in the rubyonrails forums/lists.
>
> > I don't have access of that forum due to lost of the password and i
> > think it belongs to this forum also so i put it here.
> > Thanks
>
> Sorry i misunderstood.
>
> Thanks for the suggestion
> --
> Posted viahttp://www.ruby-....

Have you tried: periodically_call_remote?

or (non-AJAX): <META HTTP-EQUIV="Refresh" CONTENT="300">

Kumar Saurav

1/19/2009 5:01:00 AM

AGoofin wrote:
> On Jan 17, 2:33ï¿½am, Kumar Saurav <sau...@cipher-tech.com> wrote:
>>
>> > I don't have access of that forum due to lost of the password and i
>> > think it belongs to this forum also so i put it here.
>> > Thanks
>>
>> Sorry i misunderstood.
>>
>> Thanks for the suggestion
>> --
>> Posted viahttp://www.ruby-....
>
> Have you tried: periodically_call_remote?
>
> or (non-AJAX): <META HTTP-EQUIV="Refresh" CONTENT="300">

Hi
As i sent you code i have to refresh the whole form not a single element
So please let me know if you have any solution regarding to whole
form.

Thanks in Advance.
--
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Albert Schlef

1/19/2009 9:20:00 AM

Kumar Saurav wrote:
> I am using Ajax Request(Rmagick in controller)
> for changing image on my DIV but the problem is it refresh for first
> time only
[...]
> render :text => "<img src='/images/xyz.jpg' />"

Perhaps the browser caches this image. The browser isn't aware that it
has changed. I suggest you add some random string to the image's URL.
E.g. /image/xyz.jpg?56543653.
--
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Kumar Saurav

1/19/2009 10:30:00 AM

Albert Schlef wrote:
> Kumar Saurav wrote:
>> I am using Ajax Request(Rmagick in controller)
>> for changing image on my DIV but the problem is it refresh for first
>> time only
> [...]
>> render :text => "<img src='/images/xyz.jpg' />"
>
> Perhaps the browser caches this image. The browser isn't aware that it
> has changed. I suggest you add some random string to the image's URL.
> E.g. /image/xyz.jpg?56543653.

Hi i just hard code the path like "public/images/xyz.jpg?1234" but after
that i get the following error

no encode delegate for this image format `public/images/xyz.jpg?1234'

RAILS_ROOT: C:/Myworkspace/css_menu_builder - import
Application Trace | Framework Trace | Full Trace

app/controllers/image_builders_controller.rb:68:in `write'
app/controllers/image_builders_controller.rb:68:in `index'

So please help me how can i add any random string after the URL
Please let me help ...
Thanks in advance

--
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Ryan Davis

1/19/2009 10:51:00 AM

On Jan 19, 2009, at 02:30 , Kumar Saurav wrote:

> So please help me how can i add any random string after the URL
> Please let me help ...

this DOES NOT belong on this list.

Albert Schlef

1/19/2009 10:57:00 AM

Kumar Saurav wrote:
> Albert Schlef wrote:
>> Kumar Saurav wrote:
>> [...]
>>> render :text => "<img src='/images/xyz.jpg' />"
>>
>> Perhaps the browser caches this image. The browser isn't aware that it
>> has changed. I suggest you add some random string to the image's URL.
>> E.g. /image/xyz.jpg?56543653.
>
> Hi i just hard code the path like "public/images/xyz.jpg?1234" but after
> that i get the following error
>
> no encode delegate for this image format `public/images/xyz.jpg?1234'

You added that random string in img_rev.write(). No good. Add it to the
URL. In other words, add it in the <img> tag. You need to send the
browser '<img src="pic.jpg?some-changing-string">' instead of just '<img
src="pic.jpg">'.
--
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Albert Schlef

1/19/2009 11:02:00 AM

Ryan Davis wrote:
> On Jan 19, 2009, at 02:30 , Kumar Saurav wrote:
>
>> So please help me how can i add any random string after the URL
>> Please let me help ...
>
> this DOES NOT belong on this list.

I'm not sure it doesn't belong here. It's an HTML/HTTP issue, not a
Rails one. It doesn't involve the Rails API, AFAICS. But I'll submit to
your judgment and forward Kumar to that other list in my next reply.
--
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comp.lang.ruby

How to refresh Image through ajax request

Kumar Saurav

Ryan Davis

Kumar Saurav

Kumar Saurav

AGoofin

Kumar Saurav

Albert Schlef

Kumar Saurav

Ryan Davis

Albert Schlef

Albert Schlef

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