gistfile1.js

YUI.add('moodle-block_codex_about-toggler', function(Y) {

  // Define a name space to call
  M.block_codex_about = M.block_codex_about || {};
  M.block_codex_about.toggler = {
    init: function() {
        // Delegate adds a single event listener rather than one per .codex_about_link
        // There's no need to loop through and get the IDs and then pass them to the eventHandler as the targetted
        // Node is available to the eventHandler in any case.
        Y.delegate('click', this.toggleShow, Y.config.doc, '.codex_about_link', this);
    },
    toggleShow: function (e) {
        // this = M.block_codex_about.toggler
        // e = the EventFacade
        // e.currentTarget is the Node which was targetted in the Y.delegate (the .codex_about_link)
        // e.currentTarget.get('id') is the id of that node
        console.log(e.currentTarget.get('id'));

        // e.currentTarget is *only* available when the context (5th argument to Y.delegate) is supplied.
        // If no context is supplied, the 'this' variable is the targetted Node.
        // http://yuilibrary.com/yui/docs/api/classes/YUI.html#method_delegate
    };

  };
}, '@VERSION@', {
  requires: ['node']
});