blocks|key|730459|text|name属性仅在<form>和表单元素(<input>、<textarea>和<select>)上有效。它用于指定与表单post中提交的名称/值对相关联的name。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|730460|例如：|730461|<input+type="checkbox"+name="foo"+value="1"+/>|code-block|syntax|javascript|730462|如果选中，将提交foo=1。在DOM中，可以通过将name指定为索引来引用form.elements集合中的表单元素。如果name不是唯一的，集合将返回一个元素数组，而不是元素。现代DOM支持按名称查找表单元素，如下所示：|730463|+document.getElementsByName(nameValue)|730464|注意:即使只找到一个元素，它也总是返回一个数组。|730465|id属性来自XML界，对于任何节点都是惟一的id，而不仅仅是表单元素。与name属性不同，它在任何HTML节点上都是有效的。与name属性一样，它也必须遵循有效的标识符规则。标识符应该以字母开头，并且只包含字母([a-zA-Z])、数字、连字符、下划线和冒号(注意，ASP.NET打破了这一规则，保留的ID以下划线开头-因此它们总是无法通过HTML/XML实际上是一些代理将它们剥离)。要通过id查找任何超文本标记语言元素，可以使用：|730466|document.getElementById(idvalue)|730467|这只返回一个DOM节点。|730468|entityMap^0|0|4|8|6|K|7|S|A|13|8|25|4|0|0|0|8|5|P|4|11|D|1P|4|0|0|0|0|2|10|4|1R|4|2Y|8|5G|2|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@$9|11|A|12|B|C]|$9|13|A|14|B|C]|$9|15|A|16|B|C]|$9|17|A|18|B|C]|$9|19|A|1A|B|C]|$9|1B|A|1C|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|1D|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|1E|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|1F|8|@$9|1G|A|1H|B|C]|$9|1I|A|1J|B|C]|$9|1K|A|1L|B|C]|$9|1M|A|1N|B|C]]|D|@]|E|$]]|$1|O|3|P|5|J|7|1O|8|@]|D|@]|E|$K|L]]|$1|Q|3|R|5|6|7|1P|8|@]|D|@]|E|$]]|$1|S|3|T|5|6|7|1Q|8|@$9|1R|A|1S|B|C]|$9|1T|A|1U|B|C]|$9|1V|A|1W|B|C]|$9|1X|A|1Y|B|C]|$9|1Z|A|20|B|C]]|D|@]|E|$]]|$1|U|3|V|5|J|7|21|8|@]|D|@]|E|$K|L]]|$1|W|3|X|5|6|7|22|8|@]|D|@]|E|$]]|$1|Y|3|-4|5|6|7|23|8|@]|D|@]|E|$]]]|Z|$]]

<p>The <code>name</code> attribute is only valid on the <code>&lt;form&gt;</code> and form elements (<code>&lt;input&gt;</code>,<code>&lt;textarea&gt;</code> and <code>&lt;select&gt;</code>). It's used to specify the <code>name</code> to associate with the name/value pair that is submitted on a form post.</p>

<p>For example:</p>

<pre><code>&lt;input type="checkbox" name="foo" value="1" /&gt;
</code></pre>

<p>if checked will submit <code>foo=1</code>. In the DOM you can reference form elements from the <code>form.elements</code> collection by specifying the <code>name</code> as the index. If <code>name</code> is not unique, the collection returns an array of elements rather than the element. Modern DOM's support looking up form elements by name as:</p>

<pre><code> document.getElementsByName(nameValue)
</code></pre>

<p>note: it always returns an array even if only one element is found.</p>

<p><code>id</code> attribute is from the XML world, and is a unique id for any node, not just form elements. Unlike the <code>name</code> attribute it is valid on any HTML node. Also like the <code>name</code> attribute, it must follow the valid identifier rules. The identifier should start with an alpha, and only contain alpha (<code>[a-zA-Z]</code>), numbers, hyphen, underscore and colons (note ASP.NET breaks this rule by starting reserved IDs with a underscore - thus they will always fail an HTML/XML lint - actually some proxies strip them). To find any HTML element by <code>id</code> you use:</p>

<pre><code>document.getElementById(idvalue)
</code></pre>

<p>this only returns one DOM node.</p>


blocks|key|946525|text|name属性不是唯一的。例如，它用于对单选按钮进行分组。它表示特定表单属性的值。id%25s必须是惟一的。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|946526|entityMap^0|0|4|14|2|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

<p>The <code>name</code> attribute is not unique. For instance, it is used to group radio buttons. It represents the value of a particular form property. <code>id</code>s must be unique.</p>


blocks|key|946568|text|ID应该是唯一的，但您可以使用多个同名的表单元素。这是单选按钮工作方式的标准，因此您可以强制选择一个单选按钮组。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|946569|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

<p>ID should be unique but you can use multiple form elements with the same NAME. This is standard for how radio buttons work so you can force one seletion of a radio button group.</p>


<p>I remember reading in the spec once that both the <code>id</code> attribute and the <code>name</code> attribute share the same namespace and have to be unique. Henceforth I've always tried to fulfill this requirement in my applications, dreading even to give the same <code>id</code> and <code>name</code> to the same element.</p>

<p>But lately I've started working with ASP.NET MVC 3, and it (like PHP) can use the same <code>name</code> attribute on several input controls to form a collection of values at server-side. I tried to look up the relevant section in the spec - but failed to find it. Perhaps I have misunderstood something then, or read the wrong documentation?</p>

<p>How is it then? I want to produce as valid HTML as possible (both 4.01 and 5 in different apps). Can I use this trick without fear? Or would I be violating something and should better stick to unique values?</p>


Does a name attribute have to be unique in a HTML document?

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我记得有一次在规范中读到，id属性和name属性共享相同的名称空间，并且必须是唯一的。从此以后，我总是试图在我的应用程序中满足这一要求，甚至不敢给同一个元素提供相同的id和name。但是最近我开始使用PHPVMVC3，它(像ASP.NET一样)可以在几个输入控件上使用相同的name属性在服务器端形成一个值集合。我试图在...

问名称属性在HTML文档中必须是唯一的吗？
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问名称属性在HTML文档中必须是唯一的吗？
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