Janna Brossard wrote: > I don't see where this can be done in rails directly, but I am hoping > some creative mind can see how to use dvarious rails pieces to do it. > > I need an ajax request like "observe_field" that triggers an action so > as to update something, but rather than a field in a form, I want to > observe a file containing json data on a server, such that when the > data changes, I read it, and perform an action with it to update > something. > > Does anyone have any idea how I might accomplish this in RoR? Thanks, > Janna B
Hi Janna, I could be mistaken but I don't think you can use observe_field in that way. It has to observe a DOM ID and the closest I think you could use in the DOM Location Object, but am unsure... I know how you can read JSON data from the file though: require 'open-uri' require 'json' url = 'http://search.twitter.com/trends.json' buffer = open(url, "UserAgent" => "Ruby-Wget").read # convert JSON data into a hash result = JSON.parse(buffer) trends = result['trends'] trends.each do |subject| puts subject['name'] + ' ' + subject['url'] end If I were having to automate this I would create a rake task that called a ruby file such as the one listed here that would read the json data from the file, and then update the database with the new information.. You could create a cron task to automate the rake task every 30 minutes or 1-hour depending... -- Posted via http://www.ruby-forum.com/. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
