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Element: hasAttributeNS() メソッド - Web API | MDN
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Element: hasAttributeNS() メソッド
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since 2015年7月.
hasAttributeNS は、現在の要素が指定された属性を持っているかどうかを示す論理値を返します。
構文
js
hasAttributeNS(namespace,localName)
引数
namespaceは属性の名前空間を特定する文字列です。localNameは属性の名前です。
返値
論理値です。
例
js
// 値をセットする前に属性が存在しているか検証します。
const d = document.getElementById("div1");
if (
d.hasAttributeNS("https://www.mozilla.org/ns/specialspace/", "special-align")
) {
d.setAttribute("align", "center");
}
仕様書
| Specification |
|---|
| DOM # ref-for-dom-element-hasattributens① |
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