ChildNode.before()

The ChildNode.before method inserts a set of Node or DOMString objects in the children list of this ChildNode's parent, just before this ChildNode. DOMString objects are inserted as equivalent Text nodes.

Syntax

[Throws, Unscopable] 
void ChildNode.before((Node or DOMString)... nodes);

Parameters

nodes

A set of Node or DOMString objects to insert.

Exceptions

• HierarchyRequestError: Node cannot be inserted at the specified point in the hierarchy.

Examples

Inserting an element

var parent = document.createElement("div");
var child = document.createElement("p");
parent.appendChild(child);
var span = document.createElement("span");

child.before(span);

console.log(parent.outerHTML);
// "<div><span></span><p></p></div>"

Inserting text

var parent = document.createElement("div");
var child = document.createElement("p"); 
parent.appendChild(child);

child.before("Text"); 

console.log(parent.outerHTML);
// "<div>Text<p></p></div>"

Inserting an element and text

var parent = document.createElement("div");
var child = document.createElement("p"); 
parent.appendChild(child); 
var span = document.createElement("span");

child.before(span, "Text"); 

console.log(parent.outerHTML);
// "<div><span></span>Text<p></p></div>"

ChildNode.before() is unscopable

The before() method is not scoped into the with statement. See Symbol.unscopables for more information.

with(node) { 
  before("foo");
}
// ReferenceError: before is not defined 

Specification

Browser compatibility

See also

• ChildNode and ParentNode
• ChildNode.after()
• ParentNode.append()
• Node.appendChild()
• Node.insertBefore()
• NodeList