Node: isDefaultNamespace() method
The isDefaultNamespace()
method of the Node
interface accepts a namespace URI as an argument.
It returns a boolean value that is true
if the namespace is the default namespace on the given node and false
if not.
Note:
The default namespace of an HTML element is always ""
. For a SVG element, it is set by the xmlns
attribute.
Syntax
js
isDefaultNamespace(namespaceURI)
Parameters
namespaceURI
-
A string representing the namespace against which the element will be checked.
Note:
namespaceURI
is not an optional parameter, but can benull
.
Return value
A boolean value that holds the return value true
or false
, indicating if the parameter is the default namespace, or not.
Example
html
Is "" the default namespace for <output>:
<output>Not tested</output>.<br />
Is "http://www.w3.org/2000/svg" the default namespace for <output>:
<output>Not tested</output>.<br />
Is "" the default namespace for <svg>: <output>Not tested</output>.<br />
Is "http://www.w3.org/2000/svg" the default namespace for <svg>:
<output>Not tested</output>.<br />
<svg xmlns="http://www.w3.org/2000/svg" height="1"></svg>
<button>Click to run tests</button>
js
const button = document.querySelector("button");
button.addEventListener("click", () => {
const aHtmlElt = document.querySelector("output");
const aSvgElt = document.querySelector("svg");
const result = document.getElementsByTagName("output");
result[0].value = aHtmlElt.isDefaultNamespace(""); // true
result[1].value = aHtmlElt.isDefaultNamespace("http://www.w3.org/2000/svg"); // false
result[2].value = aSvgElt.isDefaultNamespace(""); // false
result[3].value = aSvgElt.isDefaultNamespace("http://www.w3.org/2000/svg"); // true
});
Specifications
Specification |
---|
DOM Standard # dom-node-isdefaultnamespace |
Browser compatibility
BCD tables only load in the browser