Template passes non-nil object becomes nil in frontend

Question

basically I have an object wanted to pass to the frontend. I logged it in the backend and it was not null, but in the frontend when I alerted it, it becomes null.

...
presentation := &presentationStruct {
  Object: object,
}
log.Errorf("%v", object) // not null
template.Execute(writer, presentation)
...

// but it becomes null here
alert({{.Object}})

The object is a type of

map[string]map[string]struct {
  []float32
  map[int][]struct {
    string
    float32
  }
}

Is it because the type is too complicated?

Answer 1

No, it does not matter that the type is complicated. Template is not for passing struct from backend in Go to frontend in JavaScript. It is just do string replacement, replace strings in template with variables in Go and send final string.