The Element.before()
method inserts a set of Node
or string objects in the children list of this Element
's parent, just before this Element
. String objects are inserted as equivalent Text
nodes.
The Element.before()
method inserts a set of Node
or string objects in the children list of this Element
's parent, just before this Element
. String objects are inserted as equivalent Text
nodes.
js
before(param1) before(param1, param2) before(param1, param2, /* …, */ paramN)
None (undefined
).
HierarchyRequestError
DOMException
Thrown when the node cannot be inserted at the specified point in the hierarchy.
js
let container = document.createElement("div"); let p = document.createElement("p"); container.appendChild(p); let span = document.createElement("span"); p.before(span); console.log(container.outerHTML); // "<div><span></span><p></p></div>"
js
let container = document.createElement("div"); let p = document.createElement("p"); container.appendChild(p); p.before("Text"); console.log(container.outerHTML); // "<div>Text<p></p></div>"
js
let container = document.createElement("div"); let p = document.createElement("p"); container.appendChild(p); let span = document.createElement("span"); p.before(span, "Text"); console.log(container.outerHTML); // "<div><span></span>Text<p></p></div>"
Specification |
---|
DOM Standard # ref-for-dom-childnode-before① |
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
before |
54 | 17 | 49 | No | 39 | 10 | 54 | 54 | 49 | 41 | 10 | 6.0 |
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https://developer.mozilla.org/en-US/docs/Web/API/Element/before