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    Element.hasAttributeNS()

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    Summary

    hasAttributeNS returns a boolean value indicating whether the current element has the specified attribute.

    Syntax

    result =
element.hasAttributeNS(
namespace,
localName)
    • result is the boolean value true or false.
    • namespace is a string specifying the namespace of the attribute.
    • localName is the name of the attribute.

    Example

    // check that the attribute exists 
// before you set a value 
var d = document.getElementById("div1"); 
if (d.hasAttributeNS( 
        "https://www.mozilla.org/ns/specialspace/", 
        "special-align")) {
   d.setAttribute("align", "center");
}

    Notes

    DOM methods dealing with element's attributes:

    Not namespace-aware, most commonly used methods Namespace-aware variants (DOM Level 2) DOM Level 1 methods for dealing with Attr nodes directly (seldom used) DOM Level 2 namespace-aware methods for dealing with Attr nodes directly (seldom used)
    setAttribute (DOM 1) setAttributeNS setAttributeNode setAttributeNodeNS
    getAttribute (DOM 1) getAttributeNS getAttributeNode getAttributeNodeNS
    hasAttribute (DOM 2) hasAttributeNS - -
    removeAttribute (DOM 1) removeAttributeNS removeAttributeNode -

    Specification

    DOM Level 2 Core: hasAttributeNS

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