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# it's not critical for understanding | |
# but here is the associated server-side action | |
# | |
def version | |
@program = load_program! | |
@version = @program.versions.find(params[:version_id]) | |
if stale?(:last_modified => @version.updated_at, :etag => @version.cache_key) | |
render | |
end | |
end |
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// today's quiz is simple: | |
// | |
// fork this code and explain, in english, what it does. | |
// | |
// suggest simpler alternatives. | |
// | |
// if the state (of the quiz) is NOT 'complete' | |
// pass the get variable to the head variable, both of which are functions that fetch data via ajax request | |
// seems to be determining latest version by comparing last modified times of server & browser | |
// most importantly, what if i don't like getting head? | |
if(state != 'complete'){ | |
var get = function(){ | |
jq.ajax({ | |
'type' : 'GET', | |
'url' : url, | |
'cache' : false, | |
'success' : function(html){ | |
version.replaceWith(html); | |
} | |
}); | |
}; | |
var head = function(callback){ | |
jq.ajax({ | |
'type' : 'HEAD', | |
'url' : url, | |
'success' : function(res, code, xhr){ | |
var server_last_modified = xhr.getResponseHeader("Last-Modified"); | |
if(Date.parse(server_last_modified) > Date.parse(last_modified)){ | |
callback(); | |
}; | |
} | |
}); | |
}; | |
head(get); | |
}; |
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