hasAttributeNS
returns a boolean value indicating whether the current element has the specified attribute.
hasAttributeNS
returns a boolean value indicating whether the current element has the specified attribute.
js
hasAttributeNS(namespace,localName)
namespace
is a string specifying the namespace of the attribute.localName
is the name of the attribute.A boolean.
js
// Check that the attribute exists before you set a value const d = document.getElementById("div1"); if ( d.hasAttributeNS("http://www.mozilla.org/ns/specialspace/", "special-align") ) { d.setAttribute("align", "center"); }
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 Standard # ref-for-dom-element-hasattributens① |
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
hasAttributeNS |
1 | 12 | 1 | 9 | ≤12.1 | 1 | 4.4 | 18 | 4 | ≤12.1 | 1 | 1.0 |
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https://developer.mozilla.org/en-US/docs/Web/API/Element/hasAttributeNS