LOAD(...) has a "content" keyword just for it.
A() doesn't use "loading..." but "working...". it's customizable too, using 
_disable_with

On Saturday, February 6, 2016 at 12:10:15 AM UTC+1, Antonio Salazar wrote:
>
> LOAD(content=x) will replace the button with x (default content is 
> "loading...") until it gets a response back.
> A() also replaces itself with "loading..." when using the callback or cid 
> parameters, but I don't see a builtin way to replace "loading..." with, for 
> example, a spinner image.
>
> What alternatives do I have here?
>

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