< input type ="隐藏">的原始目的 [英] Original purpose of <input type="hidden">?
问题描述
我很好奇< input type =hidden> 标记的原始目的。
<现在，它经常与JavaScript一起用于存储发送到服务器的变量以及类似的东西。
- HTML 2.0已于 1995年11月发布，其中已包含 input type =hidden的规范
- JavaScript已发布 1996年3月
因此， code>< input type =hidden> 存在之前 JavaScript，那么它的原始目的是什么？我只能想象从服务器向客户端发送一个值（未发送），以保持一种状态。或者在它的历史记录中出现错误，并且< input type =hidden> 总是应该与JavaScript一起使用？
如果可能的话，请在您的答案中提供参考。
我只能想象从服务器向客户端发送一个值（不变）返回以维持某种状态。
准确地说。事实上，它今天仍然用于这个目的，因为我们今天所知道的HTTP仍然是，至少从根本上说，是一个无状态协议。
这个用例实际上是第一个如 HTML 3.2 所述（我很惊讶HTML 2.0不包含这样的描述） p>
type = hidden
这些字段不应该呈现，为服务器提供一种用表单存储状态信息的手段。当提交表单时，这将使用由相应属性定义的名称/值对来传递回服务器。这是HTTP的无状态工作。
< input type = hidden name = customerid value =c2415-345- 8563\" >
值得一提的是，HTML 3.2仅仅成为W3C推荐标准< 在JavaScript的初始版本之后，假设隐藏字段几乎总是具有相同的用途是安全的。
I am curious about the original purpose of the <input type="hidden"> tag.
Nowadays it is often used together with JavaScript to store variables in it which are sent to the server and things like that.
- HTML 2.0 was released in November 1995, containing already the specification for input type="hidden"
- JavaScript was released March 1996
Therefore, the <input type="hidden"> existed before JavaScript, so what was its original purpose? I can only imagine of sending a value from the server to the client which is (unchanged) sent back to maintain a kind of a state. Or do I get something wrong in the history of it and <input type="hidden"> was always supposed to be used together with JavaScript?
If possible, please also give references in your answers.
I can only imagine of sending a value from the server to the client which is (unchanged) sent back to maintain a kind of a state.
Precisely. In fact, it's still being used for this purpose today because HTTP as we know it today is still, at least fundamentally, a stateless protocol.
This use case was actually first described in HTML 3.2 (I'm surprised HTML 2.0 didn't include such a description):
type=hidden
These fields should not be rendered and provide a means for servers to store state information with a form. This will be passed back to the server when the form is submitted, using the name/value pair defined by the corresponding attributes. This is a work around for the statelessness of HTTP. Another approach is to use HTTP "Cookies".<input type=hidden name=customerid value="c2415-345-8563">
While it's worth mentioning that HTML 3.2 became a W3C Recommendation only after JavaScript's initial release, it's safe to assume that hidden fields have pretty much always served the same purpose.
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