我知道在HTML/XHTML页面中id必须是唯一的。

对于一个给定的元素,我可以给它分配多个id吗?

<div id="nested_element_123 task_123"></div>

我意识到我有一个简单的解决方案,只需使用一个类。我只是好奇以这种方式使用id。


当前回答

I don´t think you can have two Id´s but it should be possible. Using the same id twice is a different case... like two people using the same passport. However one person could have multiple passports... Came looking for this since I have a situation where a single employee can have several functions. Say "sysadm" and "team coordinator" having the id="sysadm teamcoordinator" would let me reference them from other pages so that employees.html#sysadm and employees.html#teamcoordinator would lead to the same place... One day somebody else might take over the team coordinator function while the sysadm remains the sysadm... then I only have to change the ids on the employees.html page ... but like I said - it doesn´t work :(

其他回答

每个元素只能有一个ID,但确实可以有多个类。但不要有多个类属性;将多个类值放入一个属性中。

<div id="foo" class="bar baz bax">

完全合法。

不,单个标记不能有多个id,但我见过带有name属性和id属性的标记,一些应用程序对它们的处理是相同的。

I don´t think you can have two Id´s but it should be possible. Using the same id twice is a different case... like two people using the same passport. However one person could have multiple passports... Came looking for this since I have a situation where a single employee can have several functions. Say "sysadm" and "team coordinator" having the id="sysadm teamcoordinator" would let me reference them from other pages so that employees.html#sysadm and employees.html#teamcoordinator would lead to the same place... One day somebody else might take over the team coordinator function while the sysadm remains the sysadm... then I only have to change the ids on the employees.html page ... but like I said - it doesn´t work :(

与别人说的相反,正确的答案是肯定的

Selectors规范对此非常清楚:

如果一个元素有多个ID属性,为了ID选择器的目的,所有这些属性都必须被视为该元素的ID。这种情况可以混合使用xml:id、DOM3 Core、xml dtd和特定于名称空间的知识来实现。


Edit

澄清一下:是的,一个XHTML元素可以有多个id,例如:

<p id="foo" xml:id="bar">

但是使用空格分隔的列表将多个id分配给同一个id属性是不可能的。

不。每个DOM元素(如果它有id)都有一个唯一的id。你可以用以下方法来近似:

<div id='enclosing_id_123'><span id='enclosed_id_123'></span></div>

然后使用导航来得到你真正想要的东西。

如果你只是想应用样式,类名会更好。