In the get_content function of the block, the file "/lib/yui/yahoo/yahoo-min.js" and "/lib/yui/dom/dom-min.js" are specified for inclusion in our HTML. These files are now at "/lib/yui/2.9.0/build/yahoo/yahoo-min.js" and "/lib/yui/2.9.0/build/dom-min.js". There actually is evidence of this problem on the page that is displayed; but its hidden in the HTML code. If I look at the code included in those statements, using something like the Firebug plug-in for Firefox, I can see a "404 Not Found" error embedded in the page.
After reading through these, and then looking at existing code in Moodle 2, I believe I can replace these two HTML lines with a call to $PAGE->requires->yui2_lib(). This should add the necessary YUI code I need to my page if it is not already presently loaded. I think the line I need is:
$PAGE->requires->yui2_lib('yahoo', 'dom');Unfortunately, making this change doesn't prove that I have fixed it, since there is no problem to verify. But I believe this is correct and will leave it as such. (If anyone can confirm this or knows what is correct, comment here and I'll fix this.)
I'm going to do one more thing. Currently, the block has defaults for the search string, update rate and the number of tweets to display. These are hardcoded into the block as "#moodle", "10" and "30000" (30 seconds). It would be nicer if the site could specify their own defaults without having to change the code. To do that, I am going to add a global configuration page. I'll leave that for the next post.