Rails 3 的“data-method='delete'"是如何实现的优雅地降级? [英] How Does Rails 3's "data-method='delete'" Degrade Gracefully?
问题描述
Rails 3 做了一些很酷的事情来让 Javascript 不引人注目，所以他们做了这样的事情:
Rails 3 does some cool stuff to make Javascript unobtrusive, so they've done things like this:
= link_to "Logout", user_session_path, :method => :delete
.. 转换为
<a href="/logout" data-method="delete" rel="nofollow">Logout</a>
但我突然想到.. 当我关闭 javascript 时，该方法不再是 DELETE，而是 GET.那么是否有计划或有某种方法允许这些 data- 属性优雅地降级，以便该链接仍然是 DELETE 请求?
But it just occurred to me.. When I turn off javascript the method isn't DELETE anymore, it's GET as expected. So are there plans to, or is there some way to, allow these data- attributes to degrade gracefully, so that link still is a DELETE request?
推荐答案
他们在 Rails 3 中对这些 data- 属性所做的更改不是为了优雅降级，而是为了不引人注目的 JavaScript.
The change they made in Rails 3 with these data- attributes wasn't about graceful degradation, it was about unobtrusive JavaScript.
在 Rails 2 中，指定 :method =>:delete 在链接上会生成一大堆内联 JavaScript，这些 JavaScript 会创建一个带有隐藏输入的表单，然后提交表单.这和现在一样:关闭 JavaScript，它默认为 GET 请求.因此，支持没有 JavaScript 的情况与之前相同.
In Rails 2, specifying :method => :delete on a link would generate a whole bunch of inline JavaScript that would create a form with a hidden input and then submit the form. That was the same as it is now: turn off JavaScript and it defaults to a GET request. As such, supporting the case of no JavaScript is the same as it was before.
一种选择是使用表单/按钮而不是链接，这样您就可以将该方法作为隐藏字段包含在内，就像 Rails 2 JavaScript 所做的那样.另一种选择是让 GET 版本将您带到一个中间页面，该页面又具有表单/按钮.
One option is to use a form/button instead of a link so you can include the method as a hidden field, much like the Rails 2 JavaScript does. Another option is to have the GET version take you to an intermediate page which in turn has the form/button.
新方法的好处是不引人注目.用于更改 HTTP 动词的 JavaScript 存在于外部文件中，并使用 data- 属性来确定它应该附加到哪些元素.
The benefit of the new approach is that it's unobtrusive. The JavaScript for changing the HTTP verb exists in an external file and uses the data- attributes to determine which elements it should be attached to.
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