问题描述
我正在尝试做看起来应该很简单的事情,但由于某种原因让我望而却步.我想将点击事件添加到我的 tasks.js 文件中的链接,如下所示:
I am trying to do what seems like it should be simple, but for some reason is eluding me. I want to add a click event to a link in my tasks.js file like so:
$ ->
$('.cancel_task').click ->
$('#task_form').toggle
这呈现为:
(function() {
$(function() {
return $('.cancel_task').click(function() {
return $('#task_form').toggle;
});
});
}).call(this);
我想要的只是:
$('.cancel_task').click(function()
{
$('#task_form').toggle();
});
我如何使用 coffescript 和 rails 3.1 堆栈来实现这一点?
How do i accomplish this with coffescript and the rails 3.1 stack?
推荐答案
Coffee 应该将你所做的一切都包装在一个有限的范围内,这样你就不会用全局变量填充世界.这很有用,除非你有,否则不要忽略它.在顶层,您可以使用 this.something = "value"
导出.
Coffee is supposed to wrap everything you do in a limited scope so you don't populate the world with globals. This is useful, unless you have, don't ignore this. At the top level, you can export with a this.something = "value"
.
现在您上面的代码不起作用,因为在没有参数时函数调用需要一个括号.这将使两个片段在功能上相同.函数是 JavaScript 中的变量,因此它只是假设您想要返回该函数而不是没有括号的结果.
Now your code above doesn't work because function calls need a paren when there are no parameters. This will make the two snip-its functionally the same. Functions are variables in JavaScript, so it just assumes you want to return that function instead of it's result without the parens.
$ ->
$('.cancel_task').click ->
$('#task_form').toggle()
最后,Coffee 函数总是返回函数的最后一个值.这就是它的工作原理.所以不用担心 return
语句,你总是可以忽略结果.
Lastly, a Coffee function always returns the last value of the function. It's just how it works. So don't worry about the return
statements, you can always ignore the results.
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