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CharacterData: before() method

The before() method of the CharacterData interface inserts a set of Node objects and strings in the children list of the CharacterData's parent, just before the CharacterData node.

Strings are inserted as Text nodes; the string is being passed as argument to the Text() constructor.

Syntax

js

before(...nodes)

Parameters

nodes

A set of Node or strings to insert.

Exceptions

HierarchyRequestError DOMException

Thrown when the new nodes cannot be inserted at the specified point in the hierarchy, that is if one of the following conditions is met:

Examples

The before() method allows you to insert new nodes before a CharacterData node leaving the current node's data unchanged.

js

const h1TextNode = document.querySelector("h1").firstChild;
h1TextNode.before("h1# ");

h1TextNode.parentElement.childNodes;
// NodeList [#text "h1# ", #text "CharacterData.before()"]

h1TextNode.data;
// "CharacterData.before()"

Specifications

Browser compatibility

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

See also

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https://developer.mozilla.org/en-US/docs/Web/API/CharacterData/before