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. |
Obsolete | Initial definition. |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
firstChild | Chrome Full support 1 | Edge Full support 12 | Firefox Full support 4 | IE Full support 9 | Opera Full support 9 | Safari Full support 3 | WebView Android Full support 3 | Chrome Android Full support Yes | Firefox Android Full support 4 | Opera Android Full support 10.1 | Safari iOS Full support 3 | Samsung Internet Android Full support Yes |
Legend
- Full support
- Full support
See also
- The
TreeWalker
interface it belongs to.