From: Matt Todd <chiology@...>
Date: 2008-04-04T16:07:36+09:00
Subject: Re: Responding to AJAX - XMLHttpRequest

One thing to note is that it is expecting a Content-Type of
application/json as well as the content to be in actual JSON format.
You can simply require 'json' and call wts.to_json which should be
sufficient for your needs.

You might consider looking at Rack for building your tiny web app and
just proxy some address to it; it really cleans up handling requests
and not needing CGI, but your solution does work fine and avoids a
problem with AJAX requests failing due to cross-server requests (which
is what requests not on port 80 are considered).

Matt Todd



On Fri, Apr 4, 2008 at 2:54 AM, Tony De <tonydema@gmail.com> wrote:
> Hi all,
>
>  Perhaps someone experienced with XMLHttpRequest & ruby might be able to
>  help me.  I don't know if it's my ruby code that is failing to properly
>  respond, or the javascript making the request and handling the response.
>  I've tried just prototype, just extjs, and as you can see, a mixin of
>  both as I try and figure out why I only get one response in return.  The
>  only way I can get all of the results found in the search (server
>  script), is to build a really long string with results and pass just the
>  one "combined" result.  I don't have any more hair to pull out.
>
>  tonyd
>
>  searchlog.rb
>  ---------------------
>
>  #!/usr/local/bin/ruby -w
>  require 'cgi'
>
>  @cgi = CGI.new
>
>  # Our search params passed from our HTML page
>  sstring  = @cgi['search']
>  slogtype = @cgi['logtype']
>  smethod  = @cgi['method']
>
>  # A hash of possible logs
>  logs = {'smtp' => 'smtp', 'mail' => 'mails', 'mx' => 'mx', 'spam' =>
>  'spam', 'Dial Up' => 'radius', 'DHCP' => 'dhcp' }
>
>  # Send Response
>  def send_response(wts)
>   @cgi.header { "Content-Type: text/html" }  # Not sure if this is
>  correct - Content? necessary?
>   @cgi.out{ "#{wts}" }
>  end
>
>  ...
>  ...
>  # Search through the log
>  File.open("/var/log/#{logs[slogtype]}",
>  'r').grep(/#{search_string}/).each do |line|
>   # This works but is not "live"..
>   response = response << "#{line}<br>" # append to response string
>
>   # This dosen't work - The end result is I only get one response back
>  at my javascript call
>   send_response( "#{line}<br>" ) # send response for each result
>  end
>
>  send_response( response ) # This in conjunction with building of
>  response string
>
>  ...
>  ...
>
>  searchlog.js
>  ----------------
>  // Extjs JS Lib - extjs.com
>  Ext.onReady(function(){
>
>   // Disable the ENTER key from submitting the form
>   Ext.get('getinfo').on({
>   submit:function(e){
>     e.preventDefault();
>     return false;
>     }
>   });
>
>   // Handle form submission
>   Ext.get('submitButton').on('click', function(){
>         var pars = Form.serialize('getinfo');
>         var url = '/cgi-bin/search.rb'
>     ajaxUpdate(pars, url);
>   });
>
>  });
>
>  function ajaxUpdate(pars, url) { //Prototype.js function
>   var ajax = new Ajax.Updater({success: 'results-div', failure:
>  'results-div'}, url, {
>    method: 'get',
>    parameters: pars,
>    encoding: 'UTF-8',
>    insertion: Insertion.Bottom,
>   });
>  }
>  --
>  Posted via http://www.ruby-forum.com/.
>
>