Ruby on Rails 3表单中的_snowman参数是什么？ [英] What is the _snowman param in Ruby on Rails 3 forms for?
问题描述
form_tag 或 form_for 时，助手有一个名为 _snowman 的隐藏字段，其值为☃（ Unicode \x9731）显示出来。 那么，这是干什么用的？ >解决方案
这里是为了支持Internet Explorer 5并鼓励它使用 UTF-8 的形式。
提交消息见 here 详细说明如下：
修复几个已知的网页编码问题： p>
- 在所有表单上指定accept-charset。所有最近的浏览器以及
IE5 +都将使用指定
的编码作为表单参数
- 不幸的是，IE5 +不会查看accept-charset，除非至少有一个
字符在表单的值中不是
在页面的字符集中。由于
用户可以覆盖默认的
charset（Rails设置为UTF-8），
，我们提供一个隐藏的输入，其中包含
a unicode字符，强制IE为
查看accept-charset。
- 现在绝大多数web输入都是UTF-8，我们将入站
参数设置为UTF-8。这将
消除了ASCII-8BIT和
UTF-8之间不兼容的
编码的许多情况。
- 您可以安全地忽略params [ _snowman]
总之，您可以放心地忽略此参数。 b
不过，我不确定为什么我们会支持Internet Explorer 5这样的旧技术。如果你问我，这看起来像是一个非Ruby on Rails的决定。
In Ruby on Rails 3 (currently using Beta 4), I see that when using the form_tag or form_for helpers there is a hidden field named _snowman with the value of ☃ (Unicode \x9731) showing up.
So, what is this for?
This is here to support Internet Explorer 5 and encourage it to use UTF-8 for its forms.
The commit message seen here details it as follows:
Fix several known web encoding issues:
- Specify accept-charset on all forms. All recent browsers, as well as IE5+, will use the encoding specified for form parameters
- Unfortunately, IE5+ will not look at accept-charset unless at least one character in the form's values is not in the page's charset. Since the user can override the default
charset (which Rails sets to UTF-8), we provide a hidden input containing a unicode character, forcing IE to look at the accept-charset.- Now that the vast majority of web input is UTF-8, we set the inbound parameters to UTF-8. This will eliminate many cases of incompatible encodings between ASCII-8BIT and
UTF-8.- You can safely ignore params[:_snowman]
In short, you can safely ignore this parameter.
Still, I am not sure why we're supporting old technologies like Internet Explorer 5. It seems like a very non-Ruby on Rails decision if you ask me.
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