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Johnny Hall

2007-May-15 08:48 UTC

Problem with RJS and/or Prototype.js =>ResponseText is blank

Hi, I''ve got a real head-scratcher.  I''ve got a standard Ajax
form using
form_remote_tag, which calls a controller action which adds a comment
and then sends back some JS via RJS which updates a few items on the
page.

It did work fine but (and I''ve no idea what has happened) now it
doesn''t.  It calls the controller action but gets an empty response
back
and then redirects (it seems) to the controller directly, thus rendering
the javascript in plain text.

If I get rid of the RJS and render a partial and use :update =>
"comments" in my form_remote_tag then it does the same thing but
renders
the html partial.

You can check it out by going to the site itself at

http://indecipherable.co.uk/home/index/welcome-to-indecipherable/

Click add comment to show the form and off you go.

The server is mongrel (on my dev box as well, though it does the same
with webrick).

I''ve looked at Firebug and the request goes off ok but no responseText
comes back.

The RJS code looks like this

page.visual_effect "BlindUp", "add-comment"
page.insert_html :top, "comments", :partial =>
"/common/comments/comment", :object => @comment
page.show "show-comment"
page.replace_html "comment-count",
pluralize(@comment.entry.comments.count, "Comment")
page[:latest].visual_effect :highlight, :startcolor => "#ffffff" #,
:endcolor => "#b1d0e9"

The controller action looks like this

def comment
  @comment = Comment.new(:text => params[:text])
  @comment.user = User.find(:first)
  @comment.entry = Entry.find_by_identifier(params[:entry])
  if (@comment.save)
    @latest_comment = @comment
    # render :partial => "/common/comments/comment", :object =>
@comment
# This fails too
  else
    render :action => "show"
  end
end

The form looks like this

<% form_remote_tag(:url => { :action => :comment },
  :html => {:class => "margin-form" }) do %>
  <label for="text">
    Your Comment:
    <%= text_area_tag(:text, "", :rows => 4, :cols => 50)
%>
  </label>
  <label>
    <%= submit_tag("add your comment »", :class =>
"submit",
:disable_with => "Sending comment&hellip;") %>
  </label>
<% end %>

I''ve searched high and low and found a few similar stories but every
time the reason for the odd behaviour hasn''t been related to my code,
which seems to be pretty boilerplate to me.

Thanks for any help.

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Johnny Hall

2007-May-15 08:49 UTC

head link

Re: Problem with RJS and/or Prototype.js =>ResponseText is b

Here is the header (after the page has refreshed to .../comment) - 
nothing unusual (to my eyes).

Response Headers
Cache-Control    no-cache
Connection    Keep-Alive
Date    Tue, 15 May 2007 08:31:50 GMT
Content-Type    text/javascript; charset=utf-8
Server    WEBrick/1.3.1 (Ruby/1.8.6/2007-03-13)
Content-Length    1213
Set-Cookie 
_indecipherable_session_id=e6e8e71a0fa0bbef590ef22814a64126; path=/
Request Headers
Host    localhost:3000
User-Agent    Mozilla/5.0 (Windows; U; Windows NT 6.0; en-GB; 
rv:1.8.1.3) Gecko/20070309 Firefox/2.0.0.3
Accept 
text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5
Accept-Language    en-gb,en;q=0.5
Accept-Encoding    gzip,deflate
Accept-Charset    ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive    300
Connection    keep-alive
Referer    http://localhost:3000/home/index/welcome-to-indecipherable/
Cookie    style=null; 
_indecipherable_session_id=e6e8e71a0fa0bbef590ef22814a64126

---

The only before_filter that runs populates a couple of globals with some 
navigation data from the db.  If I stop it from running for the comment 
action, it makes no difference.

---

Here''s the (only) log entry from the action



Processing ContentController#comment (for 127.0.0.1 at 2007-05-15 
09:37:12) [POST]
  Session ID: e6e8e71a0fa0bbef590ef22814a64126
  Parameters: {"text"=>"...",
"action"=>"comment",
"controller"=>"content",
"entry"=>"welcome-to-indecipherable",
"page"=>"index",
"section"=>"home"}
  [4;36;1mComment Columns (0.000000)   [0;1mSHOW FIELDS FROM 
comments
  [4;35;1mUser Load (0.000000)   SELECT * FROM users LIMIT 
1
  [4;36;1mUser Columns (0.016000)   [0;1mSHOW FIELDS FROM 
users
has_many_polymorphs: INIT
  [4;35;1mEntry Columns (0.016000)   SHOW FIELDS FROM 
entries
  [4;36;1mTagging Columns (0.016000)   [0;1mSHOW FIELDS FROM 
taggings
has_many_polymorphs: injecting dependencies
  [4;35;1mEntry Load (0.015000)   SELECT * FROM entries WHERE 
(entries.`identifier` = ''welcome-to-indecipherable'') LIMIT 1
  [4;36;1mSQL (0.000000)   [0;1mBEGIN
  [4;35;1mSQL (0.000000)   INSERT INTO comments (`entry_id`, 
`text`, `user_id`, `created_at`) VALUES(2, ''...'', 1,
''2007-05-15
09:37:13'')
  [4;36;1mSQL (0.016000)   [0;1mCOMMIT
Rendering content/comment
Rendered /common/comments/_comment (0.00000)
  [4;35;1mSQL (0.000000)   SELECT count(*) AS count_all FROM 
comments WHERE (comments.entry_id = 2) 
Completed in 0.74900 (1 reqs/sec) | Rendering: 0.01600 (2%) | DB: 
0.07900 (10%) | 200 OK 
[http://localhost/home/index/welcome-to-indecipherable/comment]

So, it''s only running the action once, rather than once for the AJAX 
call and then again for the regular browser refresh.

It looks like the AJAX call is getting no reply or not getting to it''s 
destination and then it falls through to POST the form in the normal 
fashion.

-- 
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Jason Roelofs

2007-May-15 12:58 UTC

head link

Re: Problem with RJS and/or Prototype.js =>ResponseText is blank

Well when I post a comment, Firebug shows me an error, but the page is
redirected too fast for me to see what the error actually is.

Manually running the RJS on the comments page seems to work quite well.

You''ll need to find a way to keep the page from redirecting into the
RJS to
find out what the problem is.

Jason

On 5/15/07, Johnny Hall
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:>
>
> Hi, I''ve got a real head-scratcher.  I''ve got a standard
Ajax form using
> form_remote_tag, which calls a controller action which adds a comment
> and then sends back some JS via RJS which updates a few items on the
> page.
>
> It did work fine but (and I''ve no idea what has happened) now it
> doesn''t.  It calls the controller action but gets an empty
response back
> and then redirects (it seems) to the controller directly, thus rendering
> the javascript in plain text.
>
> If I get rid of the RJS and render a partial and use :update =>
> "comments" in my form_remote_tag then it does the same thing but
renders
> the html partial.
>
> You can check it out by going to the site itself at
>
> http://indecipherable.co.uk/home/index/welcome-to-indecipherable/
>
> Click add comment to show the form and off you go.
>
> The server is mongrel (on my dev box as well, though it does the same
> with webrick).
>
> I''ve looked at Firebug and the request goes off ok but no
responseText
> comes back.
>
> The RJS code looks like this
>
> page.visual_effect "BlindUp", "add-comment"
> page.insert_html :top, "comments", :partial =>
> "/common/comments/comment", :object => @comment
> page.show "show-comment"
> page.replace_html "comment-count",
> pluralize(@comment.entry.comments.count, "Comment")
> page[:latest].visual_effect :highlight, :startcolor =>
"#ffffff" #,
> :endcolor => "#b1d0e9"
>
> The controller action looks like this
>
> def comment
>   @comment = Comment.new(:text => params[:text])
>   @comment.user = User.find(:first)
>   @comment.entry = Entry.find_by_identifier(params[:entry])
>   if (@comment.save)
>     @latest_comment = @comment
>     # render :partial => "/common/comments/comment", :object
=> @comment
> # This fails too
>   else
>     render :action => "show"
>   end
> end
>
> The form looks like this
>
> <% form_remote_tag(:url => { :action => :comment },
>   :html => {:class => "margin-form" }) do %>
>   <label for="text">
>     Your Comment:
>     <%= text_area_tag(:text, "", :rows => 4, :cols =>
50) %>
>   </label>
>   <label>
>     <%= submit_tag("add your comment »", :class =>
"submit",
> :disable_with => "Sending comment&hellip;") %>
>   </label>
> <% end %>
>
> I''ve searched high and low and found a few similar stories but
every
> time the reason for the odd behaviour hasn''t been related to my
code,
> which seems to be pretty boilerplate to me.
>
> Thanks for any help.
>
> --
> Posted via http://www.ruby-forum.com/.
>
> >
>
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Johnny Hall

2007-May-15 15:07 UTC

head link

Re: Problem with RJS and/or Prototype.js =>ResponseText is b

Jason Roelofs wrote:> Well when I post a comment, Firebug shows me an error, but the page is
> redirected too fast for me to see what the error actually is.
> 
> Manually running the RJS on the comments page seems to work quite well.
> 
> You''ll need to find a way to keep the page from redirecting into
the RJS
> to
> find out what the problem is.
> 
> Jason
Thanks.  Yep, the script itself is fine.  I''ve been living in Firebug, 
stepping through prototype.js for the last day and I can''t for the life
of me work it out.

The call goes through to the controller but no response comes back.  I 
don''t see an error in Firebug and it doesn''t break if I set
"break on
all errors".

The controller action obviously works because it does send the JS back 
to the browser.  The JS works, as we''ve seen.

The controller action doesn''t even fire for the AJAX call (checking the
log files).

I can''t see where it calls the controller action with a
"manual" POST -
is that by design in prototype?

Is there something that needs to be set or switched on, or otherwise, to 
allow RJS to work?

I''m sure that whatever it is, it''s something
obvious/simple/annoying.

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Johnny Hall

2007-May-15 15:27 UTC

head link

Re: Problem with RJS and/or Prototype.js =>ResponseText is b

Ok.  I''ve discovered something I was wrong about above.

It does make 2 calls to the comment action - one for AJAX and one for 
the POST.

I changed the controller code to add server-side degradability, which 
has the effect of making the page work properly (I check request.xhr?).

Now, the log shows 2 entries and 2 entries are posted.

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Abel

2007-May-24 20:43 UTC

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Re: Problem with RJS and/or Prototype.js =>ResponseText is b

a bad job

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