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Theo Graham-brown

2007-Nov-18 23:59 UTC

Can someone tell my why my drag and drop doesn''t work here?

I''m attmepting to follow the Agile Web Development book but frankly the
AJAX section is pretty awful. When it comes to the drag and drop bit why
doesn''t it tell you what the actions in the controller should be?
I''ve
checked script.aculo.us and that''s not helped either. Can someone help?
Here is my code:

#arrange.rhtml

<table>
  <tr>
    <th>Main Column</th>
    <th>Side Column</th>
  </tr>
  <tr>
    <td>
      <div id="main_col_items">
        <%= render :partial => ''main_col_items'' %>
      </div>
    </td>
    <td>
      <div id="side_col_items">
        <%= render :partial => ''side_col_items'' %>
      </div>
    </td>
  </tr>
</table>


<%= drop_receiving_element(''main_col_items'',
  :accept   => ''side_col_item'',
  :complete   => "$(''spinner'').hide();",
  :before    => "$(''spinner'').show();",
  :hoverclass => ''hover'',
  :with    => "''artic='' +
encodeURIComponent(element.id.split(''_'').last())''",
  :url    => {:action=>:main_col })%>

<%= drop_receiving_element(''side_col_items'',
  :accept   => ''main_col_item'',
  :complete   => "$(''spinner'').hide();",
  :before    => "$(''spinner'').show();",
  :hoverclass => ''hover'',
  :with    => "''artic='' +
encodeURIComponent(element.id.split(''_'').last())''",
  :url    => {:action=>:side_col} )%>

#---------------------------------
# _main_col_items.rhtml

<% @issue.articles.each do |article| %>
  <% if article.column == ''main'' %>
    <% ma_id = "art_#{article.id}" %>
    <div class="main_art" id="<%= ma_id
%>"><%= article.title %></div>
    <%= draggable_element(ma_id, :ghosting=>true, :revert=>true) %>
  <% end %>
<% end %>

#---------------------------------
# _side_col_items.rhtml

<% @issue.articles.each do |article| %>
  <% if article.column != ''main'' %>
    <% si_id = "art_#{article.id}" %>
    <div class="side_art" id="<%= si_id
%>"><%= article.title %></div>
    <%= draggable_element(si_id, :ghosting=>true, :revert=>true) %>
  <% end %>
<% end %>

#---------------------------------
# issue_controller.rb

  def arrange
    @issue = Issue.find(params[:id])

  end

  def main_col
    article = Article.update(params[:artic], :column => "main")
  end

  def side_col
    article = Article.update(params[:artic], :column => "side")

  end



My problem is that nothing seems to occure for those actions, main_col
and side_col. Is params[:artic] not right? Surely this value will hold
the id from the element being dragged?


Any help would be much appreciated.

Cheers
Theo
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arpit jain

2007-Nov-19 04:23 UTC

head link

Re: Can someone tell my why my drag and drop doesn''t work here?

You need to give the accept attribute as same as the class of the
draggable element.
Try it, it will work.


On Nov 19, 2007 5:29 AM, Theo Graham-brown
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:>
> I''m attmepting to follow the Agile Web Development book but
frankly the
> AJAX section is pretty awful. When it comes to the drag and drop bit why
> doesn''t it tell you what the actions in the controller should be?
I''ve
> checked script.aculo.us and that''s not helped either. Can someone
help?
> Here is my code:
>
> #arrange.rhtml
>
> <table>
>   <tr>
>     <th>Main Column</th>
>     <th>Side Column</th>
>   </tr>
>   <tr>
>     <td>
>       <div id="main_col_items">
>         <%= render :partial => ''main_col_items''
%>
>       </div>
>     </td>
>     <td>
>       <div id="side_col_items">
>         <%= render :partial => ''side_col_items''
%>
>       </div>
>     </td>
>   </tr>
> </table>
>
>
> <%= drop_receiving_element(''main_col_items'',
>   :accept   => ''side_col_item'',
>   :complete   => "$(''spinner'').hide();",
>   :before    => "$(''spinner'').show();",
>   :hoverclass => ''hover'',
>   :with    => "''artic='' +
>
encodeURIComponent(element.id.split(''_'').last())''",
>   :url    => {:action=>:main_col })%>
>
> <%= drop_receiving_element(''side_col_items'',
>   :accept   => ''main_col_item'',
>   :complete   => "$(''spinner'').hide();",
>   :before    => "$(''spinner'').show();",
>   :hoverclass => ''hover'',
>   :with    => "''artic='' +
>
encodeURIComponent(element.id.split(''_'').last())''",
>   :url    => {:action=>:side_col} )%>
>
> #---------------------------------
> # _main_col_items.rhtml
>
> <% @issue.articles.each do |article| %>
>   <% if article.column == ''main'' %>
>     <% ma_id = "art_#{article.id}" %>
>     <div class="main_art" id="<%= ma_id
%>"><%= article.title %></div>
>     <%= draggable_element(ma_id, :ghosting=>true, :revert=>true)
%>
>   <% end %>
> <% end %>
>
> #---------------------------------
> # _side_col_items.rhtml
>
> <% @issue.articles.each do |article| %>
>   <% if article.column != ''main'' %>
>     <% si_id = "art_#{article.id}" %>
>     <div class="side_art" id="<%= si_id
%>"><%= article.title %></div>
>     <%= draggable_element(si_id, :ghosting=>true, :revert=>true)
%>
>   <% end %>
> <% end %>
>
> #---------------------------------
> # issue_controller.rb
>
>   def arrange
>     @issue = Issue.find(params[:id])
>
>   end
>
>   def main_col
>     article = Article.update(params[:artic], :column =>
"main")
>   end
>
>   def side_col
>     article = Article.update(params[:artic], :column =>
"side")
>
>   end
>
>
>
> My problem is that nothing seems to occure for those actions, main_col
> and side_col. Is params[:artic] not right? Surely this value will hold
> the id from the element being dragged?
>
>
> Any help would be much appreciated.
>
> Cheers
> Theo
> --
> Posted via http://www.ruby-forum.com/.
>
> >
>
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Theo Graham-brown

2007-Nov-19 07:44 UTC

head link

Re: Can someone tell my why my drag and drop doesn''t work here?

arpit jain wrote:> You need to give the accept attribute as same as the class of the
> draggable element.
> Try it, it will work.
> 
> 
> On Nov 19, 2007 5:29 AM, Theo Graham-brown
:(

It still doesn''t. I''ve now changed the code so
they''re both UL lists but
there''s nothing.

What happens is that I can drag them over but they snap back as soon as 
I let them go. No database update occurs. Also, my Spinner element in 
the layout isn''t being unhidden and then rehidden at all.

I just tried doing 
http://wiki.rubyonrails.org/wiki/pages/HowToUseDragAndDropSorting

for a list of articles and while I can drag them around and re-sort them 
I can see the database was never actually getting updated. Can anyone 
work out why this isn''t working?

Does anyone have similar code they can post because right now I don''t 
understand why it won''t. :(

Cheers
-- 
Posted via http://www.ruby-forum.com/.

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arpit jain

2007-Nov-19 08:05 UTC

head link

Re: Can someone tell my why my drag and drop doesn''t work here?

This problem is only because of the non matching on the class of
draggable element and the accept attribute of the
drop_receiving_element,

Give the class attribute to the element as:
# _main_col_items.rhtml

<% @issue.articles.each do |article| %>
 <% if article.column == ''main'' %>
 ######  <% ma_id = "art_#{article.id}" %>
   <div class="main_art" id="<%= ma_id
%>"><%= article.title %></div>
   <%= draggable_element(ma_id, :ghosting=>true, :revert=>true) %>
 <% end %>
<% end %>


replace the above hashed line with and try..
<% ma_id = "art_#{article.id}" , :class =>
"main_col_item"%>

or place it inside a div, give its class attribute and make the div as
draggable.




On Nov 19, 2007 1:14 PM, Theo Graham-brown
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:>
> arpit jain wrote:
> > You need to give the accept attribute as same as the class of the
> > draggable element.
> > Try it, it will work.
> >
> >
> > On Nov 19, 2007 5:29 AM, Theo Graham-brown
>
> :(
>
> It still doesn''t. I''ve now changed the code so
they''re both UL lists but
> there''s nothing.
>
> What happens is that I can drag them over but they snap back as soon as
> I let them go. No database update occurs. Also, my Spinner element in
> the layout isn''t being unhidden and then rehidden at all.
>
>
> I just tried doing
> http://wiki.rubyonrails.org/wiki/pages/HowToUseDragAndDropSorting
>
> for a list of articles and while I can drag them around and re-sort them
> I can see the database was never actually getting updated. Can anyone
> work out why this isn''t working?
>
> Does anyone have similar code they can post because right now I
don''t
> understand why it won''t. :(
>
> Cheers
> --
>
> Posted via http://www.ruby-forum.com/.
>
> >
>
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Theo Graham-brown

2007-Nov-19 08:25 UTC

head link

Re: Can someone tell my why my drag and drop doesn''t work here?

arpit jain wrote:> This problem is only because of the non matching on the class of
> draggable element and the accept attribute of the
> drop_receiving_element,
> 
> Give the class attribute to the element as:
> # _main_col_items.rhtml
> 
> <% @issue.articles.each do |article| %>
>  <% if article.column == ''main'' %>
>  ######  <% ma_id = "art_#{article.id}" %>
>    <div class="main_art" id="<%= ma_id
%>"><%= article.title %></div>
>    <%= draggable_element(ma_id, :ghosting=>true, :revert=>true)
%>
>  <% end %>
> <% end %>
> 
> 
> replace the above hashed line with and try..
> <% ma_id = "art_#{article.id}" , :class =>
"main_col_item"%>
> 
> or place it inside a div, give its class attribute and make the div as
> draggable.
> 
> 
> 
> 
> On Nov 19, 2007 1:14 PM, Theo Graham-brown
But that''s what I''ve done. I test the code you suggested but
as I
expected, I got an error. The hashed line is simply setting up a 
variable to be used twice. The div following is my draggable element and 
can be dragged. Its class is ''main_art'' and I''ve now
made sure to change
the code in the arrange.rhtml view code so that the two items accept 
items of ''side_art'' or ''main_art''
respectively.

It''s definitely not liking it. Is there a way to debug or see
what''s
happening in the actions that the drag and drop is supposed to be 
performing? I''m using Aptana but I don''t understand the debug 
functionality. In the rails casts it appears you can view the stuff 
going on in the background on the server but I''ve not yet worked out
how
to see this happening.
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arpit jain

2007-Nov-19 08:59 UTC

head link

Re: Can someone tell my why my drag and drop doesn''t work here?

You might refer development.log.
Previously i have faced the same problem where i was able to drag the
item but can''t drag it.
I solved it the way i told u.
Might be u r having another issue or i am not getting it correctly.

Thanks
Arpit

On Nov 19, 2007 1:55 PM, Theo Graham-brown
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:>
> arpit jain wrote:
> > This problem is only because of the non matching on the class of
> > draggable element and the accept attribute of the
> > drop_receiving_element,
> >
> > Give the class attribute to the element as:
> > # _main_col_items.rhtml
> >
> > <% @issue.articles.each do |article| %>
> >  <% if article.column == ''main'' %>
> >  ######  <% ma_id = "art_#{article.id}" %>
> >    <div class="main_art" id="<%= ma_id
%>"><%= article.title %></div>
> >    <%= draggable_element(ma_id, :ghosting=>true,
:revert=>true) %>
> >  <% end %>
> > <% end %>
> >
> >
> > replace the above hashed line with and try..
> > <% ma_id = "art_#{article.id}" , :class =>
"main_col_item"%>
> >
> > or place it inside a div, give its class attribute and make the div as
> > draggable.
> >
> >
> >
> >
> > On Nov 19, 2007 1:14 PM, Theo Graham-brown
>
> But that''s what I''ve done. I test the code you suggested
but as I
> expected, I got an error. The hashed line is simply setting up a
> variable to be used twice. The div following is my draggable element and
> can be dragged. Its class is ''main_art'' and I''ve
now made sure to change
> the code in the arrange.rhtml view code so that the two items accept
> items of ''side_art'' or ''main_art''
respectively.
>
> It''s definitely not liking it. Is there a way to debug or see
what''s
> happening in the actions that the drag and drop is supposed to be
> performing? I''m using Aptana but I don''t understand the
debug
> functionality. In the rails casts it appears you can view the stuff
> going on in the background on the server but I''ve not yet worked
out how
> to see this happening.
> --
>
> Posted via http://www.ruby-forum.com/.
>
> >
>
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Theo Graham-brown

2007-Nov-19 09:15 UTC

head link

Re: Can someone tell my why my drag and drop doesn''t work here?

arpit jain wrote:> You might refer development.log.
> Previously i have faced the same problem where i was able to drag the
> item but can''t drag it.
> I solved it the way i told u.
> Might be u r having another issue or i am not getting it correctly.
> 
> Thanks
> Arpit
> 
> On Nov 19, 2007 1:55 PM, Theo Graham-brown
Okay, thanks a lot Arpit :)

For what it''s worth I can now see the Sortable List I linked to earlier
working...except that the refresh totally refuses to occur after each 
drag and drop so it''s good to know something''s working. I
might look at
that again and see if I can adjust this one to work with it.

-- 
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AndyV

2007-Nov-19 19:01 UTC

head link

Re: Can someone tell my why my drag and drop doesn''t work here?

I think you misunderstood Arpit''s suggestion above.  It does not
matter what type of HTML element you use, what matters is the css
class that you use to decorate it.  For example, your main_col_items
partial renders a set of HTML elements with a ''main_art'' css
class, so
your second drop_receiving_element should have
:accept=>''main_art''
rather than :accept=>''main_col_item''.  The value that you
pass is the
class of the draggable item, not the name/class of the container from
which it is taken.

Also, be aware that the :revert=>true option that you''re passing to
the draggable_element call is telling the draggable element to snap
back into it''s original position whenever you drop it, so some of the
behavior you''re discussing is correct.

As for the actions... is the page being rendered by the
IssueController?  If not, you need to add the :controller option into
the url hash in the drop_receiving_element call.  A little named route
magic (via RESTful routes) would be better.  I suspect that correcting
the css class will resolve the issue, though.

HTH,
AndyV

On Nov 19, 2:44 am, Theo Graham-brown <rails-mailing-l...@andreas-
s.net> wrote:> arpit jain wrote:
> > You need to give the accept attribute as same as the class of the
> > draggable element.
> > Try it, it will work.
>
> > On Nov 19, 2007 5:29 AM, Theo Graham-brown
>
> :(
>
> It still doesn''t. I''ve now changed the code so
they''re both UL lists but
> there''s nothing.
>
> What happens is that I can drag them over but they snap back as soon as
> I let them go. No database update occurs. Also, my Spinner element in
> the layout isn''t being unhidden and then rehidden at all.
>
> I just tried
doinghttp://wiki.rubyonrails.org/wiki/pages/HowToUseDragAndDropSorting
>
> for a list of articles and while I can drag them around and re-sort them
> I can see the database was never actually getting updated. Can anyone
> work out why this isn''t working?
>
> Does anyone have similar code they can post because right now I
don''t
> understand why it won''t. :(
>
> Cheers
> --
> Posted viahttp://www.ruby-forum.com/.--~--~---------~--~----~------------~-------~--~----~
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Theo Graham-brown

2007-Nov-20 07:35 UTC

head link

Re: Can someone tell my why my drag and drop doesn''t work here?

AndyV wrote:> I think you misunderstood Arpit''s suggestion above.  It does not
> matter what type of HTML element you use, what matters is the css
> class that you use to decorate it.  For example, your main_col_items
> partial renders a set of HTML elements with a ''main_art''
css class, so
> your second drop_receiving_element should have
:accept=>''main_art''
> rather than :accept=>''main_col_item''.  The value that
you pass is the
> class of the draggable item, not the name/class of the container from
> which it is taken.
> 
> Also, be aware that the :revert=>true option that you''re
passing to
> the draggable_element call is telling the draggable element to snap
> back into it''s original position whenever you drop it, so some of
the
> behavior you''re discussing is correct.
> 
> As for the actions... is the page being rendered by the
> IssueController?  If not, you need to add the :controller option into
> the url hash in the drop_receiving_element call.  A little named route
> magic (via RESTful routes) would be better.  I suspect that correcting
> the css class will resolve the issue, though.
> 
> 
> HTH,
> AndyV
> 
> On Nov 19, 2:44 am, Theo Graham-brown <rails-mailing-l...@andreas-
No, I got that and I made the change you''re describing above. 
Additionally I changed my HTML to involve a List just in case.

I understand from the book that the snapback is supposed to make sure 
that you are only allowed to drop elements into the correct list but it 
seems that it won''t see the other list as correct. I''ve
actually tried
putting a render for a different action into the :main_col and :side_col 
actions but nothing''s being actually caused to function. It''s
like the
dropping side just isn''t activating anything.

I managed to get the sortable list to function okay so it seems even 
odder that this is so tricky. I''ll repost my (corrected) code now so
you
can see what I mean (I''ve ditched the partials for now).

----------------------------------------------------
# view code (arrange.rhtml):

<h1>Arrange articles for issue <%= @issue.issue_no %> (ID: <%=
@issue.id
%> ) </h1>

<div id="design">
</div>
<table>
  <tr>
    <th>Main Column</th>
    <th>Side Column</th>
  </tr>
  <tr>
    <td>
      <div id="main_col_items">
        <ul id=''main_col_list''>
        <% @issue.articles.each do |article| %>
          <% if article.column == ''main'' %>
            <% domid = "article_#{article.id}" %>
            <li class="main_art" id="<%= domid
%>"><%= article.title
%></li>
            <%= draggable_element(domid, :ghosting=>true,
:revert=>true)
%>
          <% end %>
        <% end %>
        </ul>
      </div>
    </td>
    <td>
      <div id="side_col_items">
        <ul id=''side_col_list''>
        <% @issue.articles.each do |article| %>
          <% if article.column != ''main'' %>
            <% domid = "article_#{article.id}" %>
            <li class="side_art" id="<%= domid
%>"><%= article.title
%></li>
            <%= draggable_element(domid, :ghosting=>true,
:revert=>true)
%>
          <% end %>
        <% end %>
        </ul>
      </div>
    </td>
  </tr>
</table>


<%= drop_receiving_element(''main_col_items'',
  :accept   => ''side_art'',
  :complete   => "$(''spinner'').hide();",
  :before    => "$(''spinner'').show();",
  :hoverclass => ''hover'',
  :with    => "''article='' + 
encodeURIComponent(element.id.split(''_'').last())''",
  :url    => {:action=>:main_col })%>

<%= drop_receiving_element(''side_col_items'',
  :accept   => ''main_art'',
  :complete   => "$(''spinner'').hide();",
  :before    => "$(''spinner'').show();",
  :hoverclass => ''hover'',
  :with    => "''article='' + 
encodeURIComponent(element.id.split(''_'').last())''",
  :url    => {:action=>:side_col} )%>


-------------------------------------------------
# Actions from Issue Controller

  def arrange
    @issue = Issue.find(params[:id])
  end

  def main_col
    article = Article.update(params[:article], :column => "main")
  end

  def side_col
    article = Article.update(params[:article], :column => "side")
  end



What would be good is if someone could point towards code examples that 
atually use the same method as the Agile Rails book does. 
Script.aculo.us uses a totally different method for their working but 
because they are dragging items from a place and leaving a copy of the 
original item I don''t really want to use their system. I want to sort 
between two. Moreover I can''t even see an explanation of the
'':with''
parameter to the call anywhere on their site.

Cheers
Theo
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Theo Graham-brown

2007-Nov-21 09:56 UTC

head link

Re: Can someone tell my why my drag and drop doesn''t work here?

Theo Graham-brown wrote:

A brief followup: I was fiddling with this last night. I''ve realised 
that the ''drop_receiving_element'' simply isn''t
working at all. I can see
the appropriate Javascript code being inserted into the generated HTML 
but whether I include those lines or not, the behaviour of the screen is 
identical, so there must be a fault somewhere in that call...or in my 
version of the dragdrop.js from script.aculo.us...or maybe my computer 
itself is in error?

Any ideas?
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Rails - Nov 2007 - Can someone tell my why my drag and drop doesn't work here?

Can someone tell my why my drag and drop doesn''t work here?

Re: Can someone tell my why my drag and drop doesn''t work here?

Re: Can someone tell my why my drag and drop doesn''t work here?

Re: Can someone tell my why my drag and drop doesn''t work here?

Re: Can someone tell my why my drag and drop doesn''t work here?

Re: Can someone tell my why my drag and drop doesn''t work here?

Re: Can someone tell my why my drag and drop doesn''t work here?

Re: Can someone tell my why my drag and drop doesn''t work here?

Re: Can someone tell my why my drag and drop doesn''t work here?

Re: Can someone tell my why my drag and drop doesn''t work here?