DocumentFragment: querySelector() method
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
The DocumentFragment.querySelector() method returns the
first element, or null if no matches are found, within the
DocumentFragment (using depth-first pre-order traversal of the
document's nodes) that matches the specified group of selectors.
If the selector matches an ID and this ID is erroneously used several times in the document, it returns the first matching element.
If the selectors specified in parameter are invalid a DOMException with
a SYNTAX_ERR value is raised.
Syntax
querySelector(selectors)
Parameters
selectors-
A string containing one or more CSS selectors separated by commas.
Return value
An Element object representing the first element in the document
that matches the specified set of CSS selectors, or null is returned if there are no matches.
Examples
Basic example
In this basic example, the first element in the DocumentFragment with
the class myclass is returned:
const el = documentfragment.querySelector(".myclass");
CSS syntax and the method's argument
The string argument pass to querySelector must follow the CSS syntax. To
match ID or selectors that do not follow the CSS syntax (by using semicolon or space
inappropriately for example), it's mandatory to escape the wrong character with a
double back slash:
<div id="foo\bar"></div>
<div id="foo:bar"></div>
document.querySelector("#foo\bar"); // Does not match anything
document.querySelector("#foo\\\\bar"); // Match the first div
document.querySelector("#foo:bar"); // Does not match anything
document.querySelector("#foo\\:bar"); // Match the second div
Specifications
| Specification |
|---|
| DOM # ref-for-dom-parentnode-queryselector① |
Browser compatibility
Loading…
See also
- The
DocumentFragmentinterface it belongs to.