How to access element attributes using RJS?

Rails
1

For example, in the following block:

page.select(‘.foo’).each do |element|
…
end

How would I access, just for example, the id attribute of each element
in
the collection?

I’ve randomly tried element.id and element.attributes[‘id’], but neither
of
those has worked. I’ve also been unsuccessful in finding any
documentation
on this, but it seems like such a basic task.

Thanks!
DW

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2

dw wrote:

those has worked. I’ve also been unsuccessful in finding any documentation
on this, but it seems like such a basic task.

Thanks!
DW

I’m not sure you can at the moment. I’ve been struggling to do a
conditional in my RJS template, and finally found a post saying that you
couldn’t do that because you couldn’t get at the value of the select…

3

In the examples I’ve seen the each enumerator block has two variables

page.select('.foo).each do |value, index|

page << 'alert(value.innerHTML);'

end

Also, value is used instead of element. Not sure how significant that is
but
give it a whirl.

Regards,
John

----- Original Message -----
From: “Chris T” [email protected]
To: [email protected]
Sent: Wednesday, July 19, 2006 2:52 PM
Subject: Re: [Rails] How to access element attributes using RJS?

4

A little off topic but… in a view file for lisiting links the logic
goes something like:

<% if @links.size == 0 %>

No links...

<% else %> ## for link in @link .... <% end %>

I have a form on the same page used tro create a new link. In create.rjs
I’m looking for a way to get rid of page[‘no-links’] only if it exists.
I’ve tried

page << if($(‘no-links’)) { page[‘no-links’].remove }

which is obviously wrong. Can someone tell me what to put in create.rjs
to remove #no-links if it exists in the DOM? Many thanks…

Greg

5

Try this, it assumes your controller increments the links before the rjs
file is processed

page[:no-links].remove if @links.size == 1

----- Original Message -----
From: “Greg” [email protected]
To: [email protected]
Sent: Wednesday, July 19, 2006 3:17 PM
Subject: [Rails] Re: How to access element attributes using RJS?

6

John W. wrote:

Try this, it assumes your controller increments the links before the rjs
file is processed

Thanks. I’ve attempted the following but it didn’t work:

links_controller.rb:

def create
@link = Link.new(params[:link])
@saved = @link.save
@num_links = Link.find(:all).size
if request.xhr?
page[:listing-status].replace_html “You’ve created #{@num_links}
links in #{@num_cats} categories”
page[:no-links].remove if @num_links == 1 && page[:no-links]
return
end
if @saved
flash[:message] = ‘Link was successfully created.’
redirect_to :action => ‘list’
else
render :action => ‘new’
end
end

create.rjs

if @saved
page.insert_html :after, “category-#{@link.category_id}”, :partial =>
‘link’, :object => @link
page.visual_effect :highlight, “link-#{@link.id}”
page.replace_html ‘new_link_error’, ‘’
page[‘link_url’].value = ‘http://’
page[‘link_name’].value = ‘’
page[‘link_description’].value = ‘’
else # not saved, present error messages
page.replace_html ‘new_link_error’, error_messages_for(‘link’)
page.visual_effect :appear, ‘new_link_error’, :duration => 0.5
page.visual_effect :highlight, ‘new_link_error’, :duration => 0.5
end

#Error in links_controller#create
NameError: undefined local variable or method `page’

Guess you can’t use page[] in the controller…

7

Greg wrote:

Guess you can’t use page[] in the controller…

Certainly not true. This works:

#from links_controller.rb
if request.xhr?
render :update do |page|
if @saved
page[‘listing-status’].replace_html “You’ve created
#{num_links} links in #{num_cats} categories”
page[‘no-links’].remove if @num_links == 1 && page[‘no-links’]
page.insert_html :after, “category-#{@link.category_id}”,
:partial => ‘link’, :object => @link
page.visual_effect :highlight, “link-#{@link.id}”
page.replace_html ‘new_link_error’, ‘’
page[‘link_url’].value = ‘http://’
page[‘link_name’].value = ‘’
page[‘link_description’].value = ‘’
else # not saved, present error messages
page.replace_html ‘new_link_error’, error_messages_for(‘link’)
page.visual_effect :appear, ‘new_link_error’, :duration => 0.5
page.visual_effect :highlight, ‘new_link_error’, :duration =>
0.5
end
end #end update
return
end

…I smell a helper! Cheers.

Greg