I found a really cool site called PlainJS (http://plainjs.com), and within it a great trick for requesting data cross-domain called JSONP. I’d heard of this before, but never tried it out.
Here’s the code I used: JSONP and Mustache · GitHub
I made a simple Rails app to handle the JSON reply and to populate the database. Because I was running Rails locally, it was hosted at localhost:3000, and I hosted my test HTML page using Apache, so it was at al.local/api. Even though an Ajax request from al.local to localhost:3000 fails on two counts (host and port) to be from the Same Origin, this just works. I can add a new widget and see it reflected on the HTML page.
Walter
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