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I'm using the YUI3 Autocomplete widget with a URL source returning JSON data.

I'm looking for a simple way to detect HTTP error responses, such as when the user is not authenticated. (401 response from server.)

Example:

If the user hasn't authenticated on the server, the Autocomplete widget receives a 401 response and fails silently but logs the error to the browser's JavaScript console.

I'd like to detect any error response so I can show an appropriate status or otherwise handle the error.

I've searched but haven't found documentation specific to this issue - source diving didn't help, either. I *think* I'll have to roll my own datasource object so I can issue the request and detect the error. If that's the case, is there an online example for this method?

Or is there a simpler way to pass an error event handler for this type of data source?

@davglass: Thanks, I'll check out that suggestion.

I'm hoping it's a simple as supplying an parameter to the Autocomplete widget. But that seems not to be the case.

Another way to do this without resorting to the use of the IO object adapter: use a global IO failure event handler.

While I would rather handle the error locally in the AutoComplete widget handlers, alas, it's not that simple. Using Y.on('io:failure') event handling may be a much more direct approach if all you need to do is display info about comms errors.