我找不到 js_of_ocaml 等效的document.getElementsByClassName. 规范的做法是什么？

编辑：我正在使用 js_of_ocaml v2.5。

我有以下 OCaml 程序打开 Js

和下面的 JavaScript 程序

运行编译的 ocaml 代码时，它会打印出来

有没有办法进行漂亮的打印以更好地显示格式？

我在 js_of_ocaml 中创建了一个画布，如下所示。

我只能看到一个白屏。
现在，我想在画布上添加一个水平滚动条。
我想我必须做一个比白色画布小的水平滚动条的盒子，白色画布在盒子里。
我怎样才能做到这一点？

Trying to compile ocaml into javascript.

Some OCaml code I have put in https://gist.github.com/larsr/6b3cd6f62d54d56e3f9a uses the menhir parser, and the js_of_ocaml library together. I've installed them with opam.

The code comes from http://toss.sourceforge.net/ocaml.html. It is a lexer and a parser and a main program that calls them. The goal is to generate a javascript program from the ocaml code and run it from within a web page.

I am able to compile the first Main program using only menhir with make from the Makefile in the repo, which does

and I can compile a program that only uses js_of_ocaml, with make Formula.js, which does

My problem is that now I'm unable to get ocamlfind to build JsClient.js, with

so I can't produce javascript code for 'JsClient.ml'. The error I get is that the compiler can't find the module Js which is used by JsClient. The code seems to be in the opam library in my home-dir, but I can't get the right arguments to ocamlfind to use it.

How do I compile the JsClient.ml into JsClient.js?

以下签名中的“#”是什么意思？

我想在 OCaml 中翻译以下 Javascript 示例程序，使用js_of_ocaml：

我写了以下 OCaml 片段

但是当我编译它时

它与

如何修复我的程序或编译命令来解决这个问题？

I am experimenting with js_of_ocaml and node.js. As you know, node.js makes extensive use of callbacks to implement asynchronous requests without introducing explicit threads.

In OCaml we have a very nice threading library, Lwt, coming with a very useful syntax extension. I wrote a prototype with a binding to some node library (a AWS S3 client) and added a lwt-ish layer to hide the callback.

Since there is no binding to Lwt_main for node.js, I had to run my code with Lwt.async. What are the differences between running the code with Lwt.async rather than with Lwt_main.run – the latter not existing in node.js? Is it guaranteed that the program will wait until the asynchronous threads are completed before exiting, or is this rather a lucky but random behaviour of my code?

假设我使用 Tyxml 的语法创建了一个 SVG 矩形：

如何使用 js_of_ocaml 的 API 将其插入 DOM 中？

我想做这样的事情：

但我不知道如何进行正确的类型转换。

我试图绑定的库的一部分返回一个对象 -

我不知道如何指定类类型，因为返回的对象是匿名的：

有人可以在这里提出前进的方向吗？

谢谢

缺口

刚刚开始用 Tyxml 打破僵局——似乎没有比这更进一步的了——

createCircle 参数需要一个“Dom_svg.document Js.t”，但给定一个“Dom_html.canvasElement Js.t”

有人可以给我一些关于如何将 svg 元素插入 dom 树的想法吗？

谢谢尼克