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What is your opinion (PRO an CONS) about returning HTML code as a result for an AJAX call. It is, if the app creates a new item in a list and it needs some extra parameters or some pattern customization, instead of modify it through JS, we can send it templatized through an AJAX call.
The point is that HTML snippets are sent from the server to the client computer and integrated in the document DOM. Any problem with this approach?
No problem with it at all, perfectly normal and reasonable thing to do.
There is sometimes a use-case for sending data rather than markup and expanding it with client-side templating, but that’s mostly for situations where you’re sending a lot of data and so want to keep the size on the wire down. (E.g., a large table where the HTML representation of it is 100k but the raw data in, say, JSON format would only be 10k.) Or when the templating varies depending on client-side conditions. But by and large, perfectly fine to send HTML you then incorporate into the DOM via
innerHTML(or any of several libraries’ wrappers for it that help you with the odd niggle).