TreeWalker.firstChild

The TreeWalker.firstChild() method moves the current Node to the first visible child of the current node, and returns the found child. It also moves the current node to this child. If no such child exists, returns null and the current node is not changed.

Syntax

node = treeWalker.firstChild;

Example

var treeWalker = document.createTreeWalker(
    document.body,
    NodeFilter.SHOW_ELEMENT,
    { acceptNode: function(node) { return NodeFilter.FILTER_ACCEPT; } },
    false
);
var node = treeWalker.firstChild(); // returns the first child of the root element, or null if none

Specifications

Specification	Status	Comment
DOM The definition of 'TreeWalker.firstChild' in that specification.	Living Standard	No change from Document Object Model (DOM) Level 2 Traversal and Range Specification
Document Object Model (DOM) Level 2 Traversal and Range Specification The definition of 'TreeWalker.firstChild' in that specification.	Recommendation	Initial definition.

Browser compatibility

See also

• The TreeWalker interface it belongs to.