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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( 
       "http://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

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
hasAttributeNSChrome Full support YesEdge Full support 12Firefox Full support YesIE ? Opera Full support YesSafari Full support 6WebView Android Full support YesChrome Android Full support YesFirefox Android Full support YesOpera Android Full support YesSafari iOS Full support YesSamsung Internet Android Full support Yes

Legend

Full support  
Full support
Compatibility unknown  
Compatibility unknown

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