DocumentFragment.querySelector()
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
element = documentfragment.querySelector(selectors);
Parameters
- selectors
-
Is a
DOMString
containing one or more CSS selectors separated by commas.
Examples
Basic example
In this basic example, the first element in the DocumentFragment
with
the class "myclass
" is returned:
var 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>
<script>
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
</script>
Specifications
Specification |
---|
DOM Standard # ref-for-dom-parentnode-queryselector① |
Browser compatibility
BCD tables only load in the browser
See also
- The
DocumentFragment
interface it belongs to.