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
Feature | Chrome | Edge | Firefox (Gecko) | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|---|
Basic support | 1.0 | (Yes) | 2.0 (1.8.1) | 9.0 | 9.0 | 3.0 |
Feature | Android | Edge | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
---|---|---|---|---|---|---|
Basic support | (Yes) | (Yes) | 1.0 (1.8.1) | (Yes) | 9.0 | 3.0 |
See also
- The
TreeWalker
interface it belongs to.