调用用咖啡脚本定义的函数？
[英]Calling functions defined with coffee script?
问题描述
I have the following coffeescript code to generate and alert box: 
我有以下coffeescript代码来生成和警告框：
show_alert = () ->
alert("Hello! I am an alert box!")
which compiles to: 编译为：
(function() {
var show_alert;
show_alert = function() {
return alert("Hello! I am an alert box!");
};
}).call(this);
in my html I have the following 在我的HTML中我有以下内容
<input onclick='show_alert()' type='button' value='Show alert box' />
However, no alert box shows? 但是，没有显示警告框？ The following is the html copied from the browser: 以下是从浏览器复制的html：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>Test Rails Application</title>
<style type='text/css'>.application h1 {
color: lime; }
</style>
<script type='text/javascript'>(function() {
var show_alert;
show_alert = function() {
return alert("Hello! I am an alert box!");
};
}).call(this);
</script>
</head>
<body>
<h1>Hello from applicaiton.html.haml</h1>
<div class='application'><h1>Hello World</h1>
<input onclick='show_alert()' type='button' value='Show alert box' />
</div>
</body>
</html>
Why am I not able to get an alert box to show up? 为什么我无法显示警报框？
3 个解决方案
解决方案1
23 已采纳 2012-05-05 05:01:38
Your problem is that the generated javascript code is in another scope. 您的问题是生成的JavaScript代码在另一个范围内。 You have to solve this by either adding the -b parameter to the coffeescript compiler or export your function explicitly via 您必须通过将-b参数添加到coffeescript编译器或通过显式导出函数来解决此问题
root = exports ? this
root.show_alert = () -> alert("Hello! I am an alert box!")
For more information about the exporting and scope issue have a look at https://stackoverflow.com/a/4215132/832273 有关导出和范围问题的更多信息， 请查看https://stackoverflow.com/a/4215132/832273
I created a working jsfiddle with the above coffeescript code 我用上面的coffeescript代码创建了一个有效的jsfiddle
解决方案2
10 2014-06-09 11:31:24
I found two ways to solve this issue FIRST add @ before function name 我找到了两种方法来解决这个问题FIRST在函数名之前添加@
@say_hi = () ->
$(alert('Hello!!!'))
SECOND at the end of coffee file add 在咖啡文件末尾添加第二个
window["say_hi"] = say_hi
解决方案3
4 2012-05-05 04:42:34
在你的coffeescrpt代码中，尝试将该函数保存到window： window["show_alert"] = show_alert
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