DOM interaction

[sbsoftware]

I just tried this out and am fairly impressed! Just wondering, is it possible yet to interact with the DOM from my ruby script?

[sbsoftware]

Okay, so I managed to at least execute JS code from ruby (without getting any return value though).

I extended assets/mruby_init.c to provide a global ruby method run_js that uses the emscripten API to run JS code in the browser:

#include <mruby.h>
#include <mruby/irep.h>
#include <emscripten.h>

mrb_value run_js(mrb_state* mrb, mrb_value self)
{
  char *js_code;
  mrb_get_args(mrb, "z", &js_code);
  emscripten_run_script(js_code);
  return self;
}

int main() {
  mrb_state *mrb = mrb_open();

  if (!mrb) { /* handle error */ }

  mrb_define_method(mrb, mrb->kernel_module, "run_js", run_js, MRB_ARGS_REQ(1));

  mrb_load_irep(mrb, ruby_app);

  // If an exception, print error
  if (mrb->exc) mrb_print_error(mrb);

  mrb_close(mrb);
  return 0;
}

When compiling the following hello.rb to wasm, the browser shows the alert.

run_js("window.alert(\"foo\");")

I don't know whether this is a good approach or if it was even possible in another, more straightforward way. But if not, this proof of concept could be encapsulated into a mrbgem that defines some API to interact really in both directions with the DOM in the browser.

[spiffistan]

Could this be possible using this crate?

https://github.com/web-dom/web-dom