Element.getElementsByTagNameNS()

The Element.getElementsByTagNameNS() method returns a live HTMLCollection of elements with the given tag name belonging to the given namespace. It is similar to Document.getElementsByTagNameNS, except that its search is restricted to descendants of the specified element.

Syntax

elements = element.getElementsByTagNameNS(namespaceURI, localName)

• elements is a live HTMLCollection of found elements in the order they appear in the tree.
• element is the element from where the search should start. Note that only the descendants of this element are included in the search, not the node itself.
• namespaceURI is the namespace URI of elements to look for (see Node.namespaceURI). For example, if you need to look for XHTML elements, use the XHTML namespace URI, http://www.w3.org/1999/xhtml.
• localName is either the local name of elements to look for or the special value "*", which matches all elements (see Node.localName).

Example

// check the alignment on a number of cells in a table in an XHTML document.
var table = document.getElementById("forecast-table");
var cells = table.getElementsByTagNameNS("http://www.w3.org/1999/xhtml", "td");

for (var i = 0; i < cells.length; i++) {
    var axis = cells[i].getAttribute("axis");
    if (axis == "year") {
        // grab the data
    }
}

Specifications

Browser compatibility

[1] Initially, this method was returning a NodeList; it was then changed to reflects the spec change.

[2] The behavior of element.getElementsByTagNameNS changed between Firefox 3.5 and Firefox 3.6.

• In Firefox 3.5 and before, this function would automatically case-fold any queries so that a search for "foo" would match "Foo" or "foo".
• In Firefox 3.6 and later this function is now case-sensitive so that a query for "foo" will only match "foo" and not "Foo".

For more background on this, please see this comment from Henri Sivonen about the change. You can also look at the relevant part of the standard, which states which parts of the API are case-sensitive and which parts aren't.

[3] Prior to Firefox 19, this method was returning a NodeList; it was then changed to reflects the spec change.