Name
Document.getElementById( ): find an element with the specified unique ID â DOM Level 2 Core:
Synopsis
Element getElementById(StringelementId
);
Arguments
-
elementId
The value of the
id
attribute of the desired element.
Returns
The Element node that represents the document element with
the specified id
attribute or
null
if no such element is
found.
Description
This method searches the document for an Element node with an
id
attribute whose value is
elementId
and returns that Element. If no
such Element is found, it returns null
. The value of the id
attribute is intended to be unique
within a document, and if this method finds more than one Element
with the specified elementId
, it may
return one at random, or it may return null
. This is an important and commonly
used method because it provides a simple way to obtain the Element
object that represents a specific document element. Note that the
name of this method ends with âIdâ, not with âIDâ; be careful not to
misspell it.
In HTML documents, this method searches for an element based
on the value of its id
attribute.
Use HTMLDocument.getElementsByName(
)
to search for HTML elements based on the value of their
name
attributes.
In XML documents, this method performs its search using any
attribute whose type is id
,
regardless of what the name of that attribute is. If XML attribute
types are not known (because, for example, the XML parser ignored or
could not locate the documentâs DTD), this method always returns
null
. In client-side ...
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