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问题描述

当使用HTML < input> 标记时,使用名称和 id 属性,特别是我发现它们有时被命名为相同?

解决方案

在HTML4.01中:



名称属性


  • 仅对< a> ,< form> ,< iframe> ,< img> ,< map> ,< input> ,< select> ,< textarea>

  • 名称不必是唯一的,并且可以用于将元素分组在一起,例如单选按钮&复选框

  • 不能在URL中引用,尽管JavaScript和PHP可以看到URL有变通方法

  • 在JS中引用 getElementsByName()

  • 共享与 id 属性相同的命名空间
  • 必须以字母开头

  • 根据规格是区分大小写的,但大多数现代浏览器似乎不遵循这一点

  • 用于表单元素提交信息。只有具有名称属性的输入标记才会提交给服务器



  • Id 属性




    • 对除< base> < html> ,< head> ,< meta> code> < param> ,< script> ,<风格> ,<标题>

    • 每个标识在 / em>在浏览器中呈现,可能或不可能都在同一个文件中

    • 可用作URL中的锚点引用

    • 在CSS或URL中引用# sign

    • 在JS中用 getElementById()和jQuery由 $(#< id>)

    • 空格作为名称属性

    • 必须包含至少一个字符

    • 必须以字母开头

    • 包含字母,数字以外的任何内容s,下划线( _ ),破折号( - ),冒号(:)或句点(。)

    • 不区分大小写



    在(X)HTML5中,除了以下内容外,所有内容都是相同的:

    名称属性




    • 无效于< form> 之后

    • XHTML表示它必须全部小写,但大多数浏览器不会遵循这一点



    Id 属性




    • 对任何元素有效

    • XHTML表示它必须全部小写,但大多数浏览器不会请遵循


    这个问题是在HTML4.01为标准时编写的,许多浏览器和功能都与今天不同。

    >

    When using the HTML <input> tag, what is the difference between the use of the name and id attributes especially that I found that they are sometimes named the same?

    解决方案

    In HTML4.01:

    Name Attribute

    • Valid only on <a>, <form>, <iframe>, <img>, <map>, <input>, <select>, <textarea>
    • Name does not have to be unique, and can be used to group elements together such as radio buttons & checkboxes
    • Can not be referenced in URL, although as JavaScript and PHP can see the URL there are workarounds
    • Is referenced in JS with getElementsByName()
    • Shares the same namespace as the id attribute
    • Must begin with a letter
    • According to specs is case sensitive, but most modern browsers don't seem to follow this
    • Used on form elements to submit information. Only input tags with a name attribute are submitted to the server

    Id Attribute

    • Valid on any element except <base>, <html>, <head>, <meta>, <param>, <script>, <style>, <title>
    • Each Id should be unique in the page as rendered in the browser, which may or may not be all in the same file
    • Can be used as anchor reference in URL
    • Is referenced in CSS or URL with # sign
    • Is referenced in JS with getElementById(), and jQuery by $(#<id>)
    • Shares same name space as name attribute
    • Must contain at least one character
    • Must begin with a letter
    • Must not contain anything other than letters, numbers, underscores (_), dashes (-), colons (:), or periods (.)
    • Is case insensitive

    In (X)HTML5, everything is the same except:

    Name Attribute

    • Not valid on <form> anymore
    • XHTML says it must be all lowercase, but most browsers don't follow that

    Id Attribute

    • Valid on any element
    • XHTML says it must be all lowercase, but most browsers don't follow that

    This question was written when HTML4.01 was the norm, and many browsers and features were different from today.

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07-25 15:47