Node: lookupNamespaceURI() method
The lookupNamespaceURI()
method of the Node
interface
takes a prefix as parameter and returns the namespace URI associated with it on the given node if found (and
null
if not).
Syntax
js
lookupNamespaceURI(prefix)
Parameters
prefix
-
The prefix to look for.
Note: This parameter is not optional, but can be set to
null
.
Return value
A string containing the namespace URI corresponding to the prefix.
If the prefix is not found, it returns null
.
If the requested prefix
is null
, it returns the default namespace URI.
Example
html
Namespace URL for <code>xlink</code> on <output>:
<output>Not tested</output>.<br />
Namespace URL for <code>xml</code> on <output>:
<output>Not tested</output>.<br />
Namespace URL for <code>html</code> on <output>:
<output>Not tested</output>.<br />
Namespace URL for <code>``</code> on <output>:
<output>Not tested</output>.<br />
Namespace URL for <code>svg</code> on <svg>:
<output>Not tested</output>.<br />
Namespace URL for <code>xlink</code> on <svg>:
<output>Not tested</output>.<br />
Namespace URL for <code>xml</code> on <svg>:
<output>Not tested</output>.<br />
<svg xmlns:svg="http://www.w3.org/2000/svg" height="1"></svg>
<button>Click to see the results</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.lookupNamespaceURI("xlink");
result[1].value = aHtmlElt.lookupNamespaceURI("xml");
result[2].value = aHtmlElt.lookupNamespaceURI("html");
result[3].value = aHtmlElt.lookupNamespaceURI("");
result[4].value = aSvgElt.lookupNamespaceURI("svg");
result[5].value = aSvgElt.lookupNamespaceURI("xlink");
result[6].value = aSvgElt.lookupNamespaceURI("xml");
});
Specifications
Specification |
---|
DOM Standard # dom-node-lookupnamespaceuri |
Browser compatibility
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