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

JavaScript
node = treeWalker.firstChild;

Example

JavaScript
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

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support 1.0 2.0 (1.8.1) 9.0 9.0 3.0
Feature Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support (Yes) 1.0 (1.8.1) (Yes) 9.0 3.0

See also

License

© 2016 Mozilla Contributors
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-us/docs/web/api/treewalker/firstchild

API DOM DOM Reference Method TreeWalker