Day 23 – Decode Function – Convert JSON To Objects

Sometimes you just need to pass JavaScript Objects from the client to the server be it arrays or hashes.

ruleset a60x515 {
  meta {
    name "encode-decode-example"
    description <<
      encode-decode-example
    >>
    author "Mike Grace"
    logging on
  }

  rule check_for_multiple_links {
    select when pageview ".*"
    {
      notify("Running","Will show links from tweets when you click on them") with sticky = true;
      emit <|
        $K(".stream-item").live("click", function() {

          // get app object for raising web events
          app = KOBJ.get_application("a60x515");

          // grab jQuery reference to links
          var $links = $K(this).find(".twitter-timeline-link");

          // only do the work if there is a link in the tweet
          if ($links.length > 0) {

            // create array to push links into
            var linksArray = [];

            // go through links in tweet
            $links.each(function() {
              linksArray.push( $K(this).text() );
            });

            // JSON stringify array so it can make it safely through a GET request
            var stringifiedLinks = JSON.stringify(linksArray);

            // raise event with links
            app.raise_event("check_clicked_tweet", {"links":stringifiedLinks});

          } // end of check $links length

        }); // end of live click listener
      |>;
    }
  }

  rule show_links_from_tweet {
    select when web check_clicked_tweet
    foreach event:param("links").decode() setting (link)
    {
      notify("#{link}","") with sticky = true;
    }
  }
}

14 let the user know that the app is working
16 watch for clicks on the tweet stream interface
25 only process tweet and raise event if there are links in the tweet
36 convert the JavaScript array of links found in the tweet to a JSON stringified string
39 raise web event to app with stringified array of links with the key of ‘links’
49 select when web event of ‘check_clicked_tweet’ is raised to the app
50 loop through each of the links found in the raised event by converting the JSON to an understandable object using the decode operator and set the current link to ‘link’

After clicking on tweets haphazardly on twitter.com after running the app with a bookmarklet