Element: before() method
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since April 2018.
TheElement.before() method inserts a set ofNode objects or strings in the children list of thisElement's parent, just before thisElement.Strings are inserted as equivalentText nodes.
Syntax
js
before(param1)before(param1, param2)before(param1, param2, /* …, */ paramN)Parameters
param1, …,paramNA set of
Nodeobjects or strings to insert.
Return value
None (undefined).
Exceptions
HierarchyRequestErrorDOMExceptionThrown when the node cannot be inserted at the specified point in the hierarchy.
Examples
Inserting an element
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>"Inserting text
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>"Inserting an element and text
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>"Specifications
| Specification |
|---|
| DOM # ref-for-dom-childnode-before① |