我可以从咖啡脚本文件中调用 Javascript 函数吗?

2022-01-24 00:00:00 ruby-on-rails jquery javascript coffeescript

我正在尝试从 Coffeescript 文件调用一个 JavaScript 函数，用于我的 $(document).ready() 并且它永远不会被调用.

I'm trying to call a javascript function from a Coffeescript file, for my $(document).ready() and it's never getting called.

我要调用的函数来自一个外部源，它包含在我的 html 头元素中，就在我的咖啡脚本文件的包含之前，如下所示:

The function I want to call comes from an external source that I have included in my html head element, just before the include of my coffeescript file, like this:

<script src="external.js"></script>
<%= javascript_include_tag params[:controller], 'data-turbolinks-track' => true %>

在我的咖啡脚本文件(称为 someControllerName.coffee)中，我这样做:

and in my coffeescript file (called someControllerName.coffee) I do this:

ready = ->
  ... call my method

$ -> ready

这是正确的方法吗?我可以在 Chrome 中看到我的脚本已编译为 javascript，我可以在检查器的网络"选项卡中看到它.

Is this the correct way? I can see in Chrome that my script is compile to javascript, and I can see it in the Network tab of the inspector.

我使用的是 Rails 4，这是我的 application.js

I'm using Rails 4, and this is my application.js

//= require jquery
//= require jquery.turbolinks
//= require jquery_ujs
//= require bootstrap
//= require turbolinks
//= require_tree .

如果我用 alert("..."); 替换我的方法调用，它会起作用，如果我在 $(document).ready() 中使用 javascript 调用我的 javascript 方法 效果很好.

If I replace my method call by alert("..."); it works, and if I call my javascript method using javascript in $(document).ready() it works fine.

这是我真正的 javascript 函数:

Here's my real javascript function:

var ready = function () {
  $('pre code').each(function (i, e) {
      hljs.highlightBlock(e)
  });
};

$(document).ready(ready);

我解决了这个问题:

highlight = ->
  $("pre code").each (i, e) ->
    hljs.highlightBlock(e)

$(document).on 'ready page:load', ->
  highlight()

推荐答案

这和你想的不一样:

$ -> ready

在 JavaScript 中是:

In JavaScript that is:

$(function() {
    return ready;
});

您的问题是 ready 只是对函数的引用，它不像在 Ruby 中那样是函数调用.您必须说 ready() 才能调用该函数，函数调用括号仅在您使用参数调用函数时是可选的:fx 和 f(x) 相同，但 f 和 f() 不同.

Your problem is that just ready is simply a reference to the function, it is not a function call like it would be in Ruby. You'd have to say ready() to call the function, the function calling parentheses are only optional when you're calling a function with arguments: f x and f(x) are the same but f and f() are different.

我想你想说:

$ -> ready()

甚至:

$ ready # same as $(ready)

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