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When you use a DataSource as an AutoComplete source, it's generally best to process the response into a usable format using a DataSchema of some kind so that the object that ultimately gets passed from the DataSource to AutoComplete is something AutoComplete can handle (or at least close to it). Mixing a DataSource with AutoComplete's own result locating functionality can make it hard to understand which part of a response is being processed in which place. DataSchemas do take some configuration though (they don't just magically know what to do with your data).

In this case, it looks like the DataSource is returning an array with an unparsed XMLHttpRequest object as the first item. You would need to extract that item's `responseText`, parse it as JSON to get an object, and *then* AutoComplete would be able to operate on that object.

If you're not taking advantage of the DataSource to provide data to multiple components or to perform some kind of complex schema processing, then I'd recommend getting rid of it and just letting AutoComplete handle the XHR requests itself. It will then automatically parse the responses into objects, and you can set your resultListLocator to the string "response.items" (no function needed).