Question 1

How do I upload files with cljs-ajax?

Accepted Answer

Use js/FormData to append files and send them via POST requests, but note this requires ring.middleware.multipart-params on the server and isn't supported in browsers older than IE10. Examples are in the README's FormData support section.

Question 2

cljs-ajax or fetch API: which is better for ClojureScript?

Accepted Answer

cljs-ajax offers a Clojure-friendly API with unified error handling and format support, while fetch is native JavaScript and might be lighter. Choose cljs-ajax for consistency with Clojure backends; use fetch for minimal dependencies and direct browser compatibility.

Question 3

Does cljs-ajax support WebSockets?

Accepted Answer

No, cljs-ajax is focused on HTTP requests like GET, POST, and PUT. For WebSockets, you'll need a separate library such as cljs-websockets or use JavaScript's WebSocket API directly in ClojureScript.

Question 4

How can I set up global error handlers in cljs-ajax?

Accepted Answer

Override the default-error-handler atom with your own function. This global handler will be called for any request without a custom error-handler, ensuring consistent error logging or handling across your application, as described in the options.

Question 5

What's the performance impact of using cljs-ajax in a ClojureScript app?

Accepted Answer

cljs-ajax is lightweight but adds an abstraction layer over native APIs. Using ajax-request can reduce compiled code size with advanced optimizations, but for very performance-critical apps, direct JavaScript interop might be more efficient.

Question 6

Can I use cljs-ajax with React or other frontend frameworks?

Accepted Answer

Yes, cljs-ajax is framework-agnostic and integrates with any ClojureScript web app, including those using React via libraries like Reagent or Rum. It handles HTTP requests independently of the UI layer.

cljs-ajax

What is cljs-ajax?

Overview

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Frequently Asked Questions