Rails勉強会＠大阪 第0回 - Ajax with Rails - 資料
[sample code 1] mini-Ajax
* hello.txt:
Hello, Ajax!
* list1.html:
[sample code 2] mini-Ajax with prototype.js
* list3.html:
[sample code 3] mini-Ajax with Rails
$ rails demo
$ cd demo
$ ./script/generate controller example
* app/views/layouts/example.rhtml:
<%= javascript_include_tag "prototype" %>
<%= @content_for_layout %>
* app/views/example/sample1.rhtml:
<%= link_to_remote "Hello?", :url => {:action => :hello_ajax}, :update => :hello %>
* app/controllers/example_controller.rb:
require 'kconv'
class ExampleController < ApplicationController
def hello_ajax
now = Time.now
render :text => "Hello, Ajax! (#{now})".toutf8, :layout => false
end
end
[sample code 4] Incremental search
* app/views/example/observer.rhtml:
Search term: <%= text_field_tag :search %>
<%= observe_field :search,
:frequency => 0.5,
:update => :results,
:url => {:action => :search},
:with => "'phrase=' + encodeURIComponent(value)" %>
* app/controllers/example_controller.rb:
# in class ExampleController...
WORDLIST = %w(Rails is a full-stack, open-source web framework in Ruby
for writing real-world applications with joy and less code than most
frameworks spend doing XML sit-ups)
def search
@phrase = params[:phrase]
matcher = Regexp.new(@phrase)
@results = WORDLIST.select {|word| matcher =~ word }
render :layout => false
end
* app/views/example/search.rhtml:
<% if @results.empty? %>
'<%=h @phrase %>' not found!
<% else %>
'<%=h @phrase %>' found in
<%= highlight(@results.join(", "), @phrase) %>
<% end %>
[参考文献]
* 『開発の現場 vol.2』【特別記事】Ruby on RailsでらくらくAjax開発！／舘野祐一
サンプルデータ: http://www.shoeisha.com/mag/kaihatsu/sample/kaihatsu002_RoR.lzh
* AWDwR BETA-BOOK p.375
18.2 The Rails Way | Observers