AJAX problem

Rails
1

Hello everyone :slight_smile:

I have this ajax issue, I’d be glad if someone would be willing to
help, thanks :slight_smile:

What I try to do:
Have a select box with a list of countries.
When the country select box value is changed, have the state box
appear.
Up to this point, I got this successfully.

When the state box gets changed, have the city box appear for
selection. This is what I couldn’t acheive…

How I coded it:
In my rhtml page I got this code:

<%= select “assoc”, “country_id”, @country_options, {:include_blank =>
true} %>
<%= observe_field(:assoc_country_id,
:frequency => 0.5,
:update => :states,
:url => { :action => :show_states_select },
:with => “‘country_id=’ + value”) %>

In show_states_select.rhtml, I got this:
<%= select ‘assoc’, ‘state_id’, @state_options, {:include_blank =>
true} %>

<%= observe_field(:assoc_state_id,
:frequency => 0.5,
:update => :cities,
:url => { :action => :show_cities_select },
:with => “‘state_id=’ + value”) %>

And show_cities_select.rhtml:
<%= select ‘user’, ‘city_id’, @city_options, {:include_blank => true}
%>

I think it does not appear because maybe the second observe_field
comes from ajax request and maybe is not interpreted, I don’t know, if
someone could help me, I’d appreciate…

Thank you :slight_smile:

2

Come on, no idea for this ?

3

(My apologies if this gets double-posted - I sent it last night but
haven’t
gotten any indication that it was received. It might be something weird
with GMail, however)

Hello, everyone.

I’m currently working on a politically-themed social networking site
that I
hope will grow in the near future. I’ve decided to use (obviously) Ruby
on
Rails to write the site, although I come from an ASP.NET background and
this
is my first real foray into RoR and anything outside of the MS world
(I’ve
dabbled very little in Linux, so I know the basics but not much else).

The issue I’m running into, however, is that I want to have an
integrated
blogging module that allows for multiple blogs by multiple users, each
with
different URLs - a core feature of the site is that it will host various
related blogs by different people, hopefully with subdomains such as
johndoe.mysite.com (which would redirect to something like
mysite.com/blogs/johndoe). I’d also like to have integrated forums, so
that
when a user joins the site, their session spans to the forums, and for
posting comments to blogs (we only want to allow registered users to
post
comments), and the like. The integrated forums is a must because users
can
have special icons based on information in their profile (if they own a
business, for example, and want to associate with the site), but other
than
that there are no specific requirements outside of a normal forum.

My web host (HostingRails) has some options built-in, but they’re all
PHP
based and I’m finding that they don’t really integrate well with the RoR
application (one of the PHP boards especially, since it uses a similar
URL
method to Rails, and thus Rails tries to parse it, only to fail and give
me
a 404); I could use them in a pinch, but I’d really like a unified look
and
feel to the site. As I said, I’m relatively new to RoR development (I’ve
read through the Agile Web D. With Rails book twice now) so,
while
I could probably try my hand at writing custom functionality, I figure
I’d
take a chance and see if there’s anything that I can use as the base
first.

Is there anything out there that would fulfil my needs, or would I be
better
off rolling up my sleeves and coding my own? I have an idea of what it
would
take, I’m just not confident enough in my RoR skills to think I could do
a
very good job of it, as I’m still pretty much a newbie.

I’m hoping that someone can point me in the right direction, or at least
offer some suggestions I can look into. Many thanks!

No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.5.516 / Virus Database: 269.20.7/1285 - Release Date:
2/18/2008
5:50 AM

4

Check out railscasts.com. Ryan B. did an excellent cast on exactly
this topic a few weeks ago (no. 88 - Dynamic Select Menus). Better
than AJAX, since it is all processed client-side. (You’d also be able
to use the caching methods, since your available options aren’t going
to change very often.)

5

why not have an
onChange=“showState();”
on the country list.

then in some JS have
function showState(){
// use CSS to show the box.
document.getElementById(‘user_city_id’).style.display=‘block’;
}
to make it “appear”

and you can “hide” the city box by adding some JS at the bottom of the
page.
// use CSS to hide the box.
document.getElementById(‘user_city_id’).style.display=‘none’;
This way if the user does not have JS turned on they will still see
the city box.

John I.

6

Unless I misunderstand the problem, the issue is that he wants to
dynamically populate the city and state selects based on the user’s
choices. Pick country A and you get a list of n States populated into
the state select. Pick state B from the newly visible state select
and you get m cities in that state populated into the newly visible
city select.

@pierre – I think that IE gets very cranky about executing JS that
was not part of the original page. You may find that you need to
compromise here. Create the selects and the observers and hide their
containing divs. Your AJAX method can then either replace the
previously empty select OR add the options to it (rather than
rendering a new select with options and its observer). The return js
would finish up by making the containing div visible.

HTH,
AndyV