pub trait Element: Node {
Show 16 methods
fn get_attribute(&self, name: &str) -> Option<String>;
fn set_attribute(&mut self, name: &str, value: &str) -> Result<()>;
fn remove_attribute(&mut self, _name: &str) -> Result<()>;
fn get_attribute_node(&self, name: &str) -> Option<Self::NodeRef>;
fn set_attribute_node(
&mut self,
new_attribute: Self::NodeRef
) -> Result<Self::NodeRef>;
fn remove_attribute_node(
&mut self,
_old_attribute: Self::NodeRef
) -> Result<Self::NodeRef>;
fn get_elements_by_tag_name(&self, _tag_name: &str) -> Vec<Self::NodeRef>ⓘNotable traits for Vec<u8, A>impl<A> Write for Vec<u8, A> where
A: Allocator,
;
fn get_attribute_ns(
&self,
_namespace_uri: &str,
_local_name: &str
) -> Option<String>;
fn set_attribute_ns(
&mut self,
namespace_uri: &str,
qualified_name: &str,
value: &str
) -> Result<()>;
fn remove_attribute_ns(
&mut self,
_namespace_uri: &str,
_local_name: &str
) -> Result<()>;
fn get_attribute_node_ns(
&self,
_namespace_uri: &str,
_local_name: &str
) -> Option<Self::NodeRef>;
fn set_attribute_node_ns(
&mut self,
_new_attribute: Self::NodeRef
) -> Result<Self::NodeRef>;
fn get_elements_by_tag_name_ns(
&self,
_namespace_uri: &str,
_local_name: &str
) -> Vec<Self::NodeRef>ⓘNotable traits for Vec<u8, A>impl<A> Write for Vec<u8, A> where
A: Allocator,
;
fn has_attribute(&self, name: &str) -> bool;
fn has_attribute_ns(&self, namespace_uri: &str, local_name: &str) -> bool;
fn tag_name(&self) -> String { ... }
}
Expand description
This corresponds to the DOM Element
interface.
Specification
The Element
interface represents an element in an HTML or XML document. Elements may have
attributes associated with them; since the Element
interface inherits from Node
,
the generic Node
interface attribute attributes may be used to retrieve the set of all
attributes for an element. There are methods on the Element
interface to retrieve either an
Attr
object by name or an attribute value by name. In XML, where an
attribute value may contain entity references, an Attr
object should be retrieved to examine
the possibly fairly complex sub-tree representing the attribute value. On the other hand, in
HTML, where all attributes have simple string values, methods to directly access an attribute
value can safely be used as a convenience.
Note: In DOM Level 2, the method normalize
is inherited from the Node
interface where
it was moved.
Required Methods
fn get_attribute(&self, name: &str) -> Option<String>
fn get_attribute(&self, name: &str) -> Option<String>
Retrieves an attribute value by name.
Specification
Parameters
name
of typeDOMString
: The name of the attribute to retrieve.
Return Value
DOMString
: TheAttr
value as a string, or the empty string if that attribute does not have a specified or default value.
Adds a new attribute.
Specification
If an attribute with that name is already present in the element, its value is changed to be that of the value parameter. This value is a simple string; it is not parsed as it is being set. So any markup (such as syntax to be recognized as an entity reference) is treated as literal text, and needs to be appropriately escaped by the implementation when it is written out. In order to assign an attribute value that contains entity references, the user must create an Attr node plus any Text and EntityReference nodes, build the appropriate subtree, and use setAttributeNode to assign it as the value of an attribute.
To set an attribute with a qualified name and namespace URI, use the setAttributeNS
method.
Parameters
name
of typeDOMString
: The name of the attribute to create or alter.value
of typeDOMString
: Value to set in string form.
Exceptions
INVALID_CHARACTER_ERR
: Raised if the specified name contains an illegal character.NO_MODIFICATION_ALLOWED_ERR
: Raised if this node is readonly.
fn remove_attribute(&mut self, _name: &str) -> Result<()>
fn remove_attribute(&mut self, _name: &str) -> Result<()>
Removes an attribute by name. If the removed attribute is known to have a default value, an attribute immediately appears containing the default value as well as the corresponding namespace URI, local name, and prefix when applicable.
Specification
To remove an attribute by local name and namespace URI, use the removeAttributeNS
method.
Parameters
name
of typeDOMString
: The name of the attribute to remove.
Exceptions
NO_MODIFICATION_ALLOWED_ERR
: Raised if this node is readonly.
fn get_attribute_node(&self, name: &str) -> Option<Self::NodeRef>
fn get_attribute_node(&self, name: &str) -> Option<Self::NodeRef>
Retrieves an attribute node by name.
Specification
To retrieve an attribute node by qualified name and namespace URI, use the
getAttributeNodeNS
method.
Parameters
name
of typeDOMString
: The name (nodeName
) of the attribute to retrieve.
Return Value
Attr
: TheAttr
node with the specified name (nodeName
) or null if there is no such attribute.
fn set_attribute_node(
&mut self,
new_attribute: Self::NodeRef
) -> Result<Self::NodeRef>
fn set_attribute_node(
&mut self,
new_attribute: Self::NodeRef
) -> Result<Self::NodeRef>
Adds a new attribute node.
Specification
If an attribute with that name (nodeName
) is already present in the element, it is
replaced by the new one.
To add a new attribute node with a qualified name and namespace URI, use the
setAttributeNodeNS
method.
Parameters
newAttr
of typeAttr
: TheAttr
node to add to the attribute list.
Return Value
Attr
: If thenewAttr
attribute replaces an existing attribute, the replacedAttr
node is returned, otherwisenull
is returned.
Exceptions
WRONG_DOCUMENT_ERR
: Raised ifnewAttr
was created from a different document than the one that created the element.NO_MODIFICATION_ALLOWED_ERR
: Raised if this node is readonly.INUSE_ATTRIBUTE_ERR
: Raised ifnewAttr
is already an attribute of anotherElement
object. The DOM user must explicitly cloneAttr
nodes to re-use them in other elements.
fn remove_attribute_node(
&mut self,
_old_attribute: Self::NodeRef
) -> Result<Self::NodeRef>
fn remove_attribute_node(
&mut self,
_old_attribute: Self::NodeRef
) -> Result<Self::NodeRef>
Removes the specified attribute node.
Specification
If the removed Attr
has a default value it is immediately replaced. The replacing
attribute has the same namespace URI and local name, as well as the original prefix, when
applicable.
Parameters
oldAttr
of typeAttr
: TheAttr
node to remove from the attribute list.
Return Value
Attr
: TheAttr
node that was removed.
Exceptions
NO_MODIFICATION_ALLOWED_ERR
: Raised if this node is readonly.NOT_FOUND_ERR
: Raised if oldAttr is not an attribute of the element.
Returns a NodeList
of all descendant Element
s with a given tag name, in the order in
which they are encountered in a preorder traversal of this Element
tree.
Specification
Parameters
name
of typeDOMString
: The name of the tag to match on. The special value “*” matches all tags.
Return Value
NodeList
: A list of matchingElement
nodes.
Retrieves an attribute value by local name and namespace URI.
Specification
HTML-only DOM implementations do not need to implement this method.
Parameters
namespaceURI
of typeDOMString
: The namespace URI of the attribute to retrieve.localName
of typeDOMString
: The local name of the attribute to retrieve.
Return Value
DOMString
: TheAttr
value as a string, or the empty string if that attribute does not have a specified or default value.
Adds a new attribute.
Specification
If an attribute with the same local name and namespace URI is already present on the
element, its prefix
is changed to be the prefix part of the qualifiedName
, and its
value
is changed to be the value parameter. This value is a simple string; it is not
parsed as it is being set. So any markup (such as syntax to be recognized as an entity
reference) is treated as literal text, and needs to be appropriately escaped by the
implementation when it is written out. In order to assign an attribute value that contains
entity references, the user must create an Attr
node plus any Text
and EntityReference
nodes, build the appropriate subtree, and use setAttributeNodeNS
or setAttributeNode
to assign it as the value of an attribute.
HTML-only DOM implementations do not need to implement this method.
Parameters
namespaceURI
of typeDOMString
: The namespace URI of the attribute to create or alter.qualifiedName
of typeDOMString
: The qualified name of the attribute to create or alter.value
of typeDOMString
: The value to set in string form.
Exceptions
INVALID_CHARACTER_ERR
: Raised if the specified qualified name contains an illegal character.NO_MODIFICATION_ALLOWED_ERR
: Raised if this node is readonly.NAMESPACE_ERR
: Raised if thequalifiedName
is malformed, if thequalifiedName
has a prefix and thenamespaceURI
is null, if thequalifiedName
has a prefix that is “xml” and thenamespaceURI
is different from “http://www.w3.org/XML/1998/namespace”, or if thequalifiedName
is “xmlns” and thenamespaceURI
is different from “http://www.w3.org/2000/xmlns/”.
Removes an attribute by local name and namespace URI.
Specification
If the removed attribute has a default value it is immediately replaced. The replacing attribute has the same namespace URI and local name, as well as the original prefix.
HTML-only DOM implementations do not need to implement this method.
Parameters
namespaceURI
of typeDOMString
: The namespace URI of the attribute to remove.localName
of typeDOMString
: The local name of the attribute to remove.
Exceptions
NO_MODIFICATION_ALLOWED_ERR
: Raised if this node is readonly.
Retrieves an Attr node by local name and namespace URI.
Specification
HTML-only DOM implementations do not need to implement this method.
Parameters
namespaceURI
of typeDOMString
: The namespace URI of the attribute to retrieve.localName
of typeDOMString
: The local name of the attribute to retrieve.
Return Value
Attr
: TheAttr
node with the specified attribute local name and namespace URI ornull
if there is no such attribute.
fn set_attribute_node_ns(
&mut self,
_new_attribute: Self::NodeRef
) -> Result<Self::NodeRef>
fn set_attribute_node_ns(
&mut self,
_new_attribute: Self::NodeRef
) -> Result<Self::NodeRef>
Adds a new attribute.
Specification
If an attribute with that local name and that namespace URI is already present in the element, it is replaced by the new one.
HTML-only DOM implementations do not need to implement this method.
Parameters
newAttr
of typeAttr
: TheAttr
node to add to the attribute list.
Return Value
Attr
: If thenewAttr
attribute replaces an existing attribute with the same local name and namespace URI, the replacedAttr
node is returned, otherwisenull
is returned.
Exceptions
WRONG_DOCUMENT_ERR
: Raised if newAttr was created from a different document than the one that created the element.NO_MODIFICATION_ALLOWED_ERR
: Raised if this node is readonly.INUSE_ATTRIBUTE_ERR
: Raised ifnewAttr
is already an attribute of anotherElement
object. The DOM user must explicitly cloneAttr
nodes to re-use them in other elements.
Returns a NodeList
of all the descendant Element
s with a given local name and namespace
URI in the order in which they are encountered in a preorder traversal of this Element tree.
Specification
HTML-only DOM implementations do not need to implement this method.
Parameters
namespaceURI
of typeDOMString
: The namespace URI of the elements to match on. The special value “*” matches all namespaces.localName
of typeDOMString
: The local name of the elements to match on. The special value “*” matches all local names.
Return Value
NodeList
: A newNodeList
object containing all the matchedElement
s.
fn has_attribute(&self, name: &str) -> bool
fn has_attribute(&self, name: &str) -> bool
Returns true
when an attribute with a given name is specified on this element or has a default
value, false
otherwise.
Specification
Parameters
name
of typeDOMString
: The name of the attribute to look for.
Return Value
boolean
:true
if an attribute with the given name is specified on this element or has a default value,false
otherwise.
fn has_attribute_ns(&self, namespace_uri: &str, local_name: &str) -> bool
fn has_attribute_ns(&self, namespace_uri: &str, local_name: &str) -> bool
Returns true
when an attribute with a given local name and namespace URI is specified on
this element or has a default value, false
otherwise.
Specification
HTML-only DOM implementations do not need to implement this method.
Parameters
namespaceURI
of typeDOMString
: The namespace URI of the attribute to look for.localName
of typeDOMString
: The local name of the attribute to look for.
Return Value
boolean
:true
if an attribute with the given local name and namespace URI is specified or has a default value on this element,false
otherwise.
Provided Methods
The name of the element.
Specification
For example, in:
<elementExample id="demo">
...
</elementExample>
tagName
has the value “elementExample”. Note that this is case-preserving in XML, as
are all of the operations of the DOM. The HTML DOM returns the tagName
of an HTML element
in the canonical uppercase form, regardless of the case in the source HTML document.