在application.js中运行root_path

How can I get my hands on the project's root_path in my application.js file?

如何在application.js文件中获取项目的root_path?

I need it for a js plugin (codemirror) that needs to load other JS files. It's all fine and dandy if I say "/javascripts/needed_file.js", but what if I deploy my project to "/custom".

我需要它来为需要加载其他JS文件的js插件(codemirror)。如果我说“/javascripts/needed_file.js”,这一切都很好,但如果我将项目部署到“/ custom”会怎么样。

The code needs to do its magic all over the project and I would like it to be UJS, so it needs to be in a static javascript file.

代码需要在整个项目中发挥其魔力,我希望它是UJS,所以它需要在一个静态的javascript文件中。

Any solutions/simple hacks?

任何解决方案/简单的黑客?

3 个解决方案

#1

There's no beautiful solution. I'd try one of these approaches:

没有漂亮的解决方案。我会尝试以下方法之一:

Inspect window.location.pathname. Determine from this whether running from root or from a prefix url.

检查window.location.pathname。从中确定是从root运行还是从前缀url运行。
Add something like <script type="text/javascript" charset="utf-8">var ROOT_PATH = '<%= Rails.root_path %>';</script> somewhere to the top of your layout file.

在 var ROOT_PATH ='<%= Rails.root_path%>'; 之类的位置添加到布局文件的顶部。
Use this quite hackish function (I suspect that it might break with some of the HTML5 script attributes):

使用这个非常hackish函数(我怀疑它可能会破坏一些HTML5脚本属性):
```
function urlOfCurrentFile() {
  var scripts = document.getElementsByTagName("script");
  return scripts[scripts.length - 1].src;
}
```

#2

I have this in my header file.

我在头文件中有这个。

<script type="text/javascript">
  var BASE_URL = '<%= root_url %>';
</script>

#3

Well, the best way I find is to leverage the power of JS to do so, like:

好吧,我找到的最好方法是利用JS的强大功能,例如:

window.location.origin # http://localhost:3000/

It's gonna give you the complete hostname, with http://, and the port number. Like in case of running Rails server locally, it will give you: http://localhost:3000

它将为您提供完整的主机名,http://和端口号。就像在本地运行Rails服务器一样,它会给你:http:// localhost:3000

window.location.hostname # localhost

It's just gonna give you the name of host, and nothing about port or HTTP. Incase of Rails server running locally, it will give you: localhost.

它只会给你主机的名称,而不是端口或HTTP。如果在本地运行Rails服务器,它将为您提供:localhost。

#1