It is always beneficial to include some code in your project.
If you are dealing with a large HTML document, using jQuery to traverse the DOM can be resource-intensive.
When it comes to performance, jQuery Selectors have a hierarchy:
- #Id
- Element
- .class, :pseudoclass and :custom
The Class, PseudoClass, and Custom selectors might not perform as well as ID and Element selectors. To improve their efficiency, try combining them with other types of selectors whenever possible.
For instance:
$(".oddRows"); //Not optimized: scans entire DOM for elements with oddrows class
$("tr.oddRows"); //Better: only searches <tr> elements with oddrows class
$("#MyTable tr.oddRows"); //Even better: looks for descendents of #MyTable
("#MyTable>tbody>tr.oddRows"); //Best practice: targets immediate children
In these examples, we demonstrate how combining CSS style selectors can enhance performance in different scenarios.
- Element.WithClass – Searching for an element with a specific class name
- #Id Descendents – Searching within descendents of a particular Id
- #Id>Children – Targeting only immediate children
Optimizing selector performance is crucial for efficient jQuery usage. This should be a key focus for developers and reviewers alike.
UPDATE Regarding Firefox and JavaScript Speed
There have been reports indicating that newer versions of FF have implemented improvements in JavaScript performance:
3.1 -
3.6 -