NamedNodeMap: setNamedItemNS() method
The setNamedItemNS()
method of the NamedNodeMap
interface
puts the Attr
identified by its name in the map.
If there was already an Attr
with the same name in the map,
it is replaced.
Note: This method is an alias of setNamedItem()
you can use them
interchangeably.
Syntax
js
setNamedItemNS(attr)
Parameters
attr
-
The attribute to insert in the map.
Return value
Returns the old attribute if replaced, or null
if the attribute is new.
Exceptions
InUseAttributeError
DOMException
-
Thrown if the attribute is still part of another map.
Example
html
<span ob:one="one"></span>
<pre></pre>
js
const parser = new DOMParser();
// ob:one in <span> is not in a namespace, while ob:one in <warning>, is.
const xmlString =
'<warning ob:one="test" xmlns:ob="http://www.example.com/ob">Beware!</warning>';
const doc = parser.parseFromString(xmlString, "application/xml");
const span = document.querySelector("span");
const pre = document.querySelector("pre");
const warning = doc.querySelector("warning");
const attrMap = span.attributes;
let result = `The '<span>' element initially contains ${attrMap.length} attribute.\n\n`;
result += "We remove `one` from '<span>' and adds it to '<pre>'.\n";
const one = warning.attributes.removeNamedItemNS(
"http://www.example.com/ob",
"one"
);
attrMap.setNamedItemNS(one);
result += `The '<span>' element now contains ${span.attributes.length} attributes:\n\n`;
result += "Prefix\tLocal name\tQualified name\n";
result += "=========================================\n";
for (const attr of attrMap) {
result += `${attr.prefix}\t${attr.localName}\t\t${attr.name}\n`;
}
pre.textContent = result;
Specification
Specification |
---|
DOM Standard # dom-namednodemap-setnameditemns |
Browser compatibility
BCD tables only load in the browser