在CoffeeScript中，是否有“正式"方式在运行时而不是在编译时内插字符串? [英] In CoffeeScript, is there an 'official' way to interpolate a string at run-time instead of when compiled?

问题描述

我在CS类中有一个options对象，我想在其中保留一些模板:

I have an options object in my CS class, and I'd like to keep some templates in it:

class MyClass
    options:
        templates:
            list: "<ul class='#{ foo }'></ul>"
            listItem: "<li>#{ foo + bar }</li>"
            # etc...

然后，我想在代码中稍后插入这些字符串.但是，当然，它们会被编译为"<ul class='" + foo +"'></ul>"，而foo是未定义的.

Then I'd like to interpolate these strings later in the code... But of course these are compiled to "<ul class='" + foo +"'></ul>", and foo is undefined.

在运行时是否有使用.replace()的官方CoffeeScript方法?

Is there an official CoffeeScript way to do this at run-time using .replace()?

我最终写了一个小工具来帮助:

I ended up writing a little utility to help:

# interpolate a string to replace {{ placeholder }} keys with passed object values
String::interp = (values)->
    @replace /{{ (\w*) }}/g,
        (ph, key)->
            values[key] or ''

所以我的选择现在看起来像:

So my options now look like:

templates:
    list: '<ul class="{{ foo }}"></ul>'
    listItem: '<li>{{ baz }}</li>'

然后在代码中稍后:

template = @options.templates.listItem.interp
    baz: foo + bar
myList.append $(template)

推荐答案

我会说，如果需要延迟求值，则应该将它们定义为函数.

I'd say, if you need delayed evaluation, then they should probably be defined as functions.

也许单独取值:

templates:
    list: (foo) -> "<ul class='#{ foo }'></ul>"
    listItem: (foo, bar) -> "<li>#{ foo + bar }</li>"

或从上下文对象中获得

templates:
    list: (context) -> "<ul class='#{ context.foo }'></ul>"
    listItem: (context) -> "<li>#{ context.foo + context.bar }</li>"

---

鉴于您现在的评论，您可以像上面那样使用上面的第二个示例:

---

Given your now-former comments, you could use the 2nd example above like so:

$(options.templates.listItem foo: "foo", bar: "bar").appendTo 'body'

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