An Introduction by Karl Voelker

jQuery is an all-purpose JavaScript library.

It helps you do two things:

1. Write less
2. Do more

jQuery was created by John Resig, an alumnus of CSH.

Having an interactive web page usually means lots of DOM code. This is a problem:

• DOM code is verbose
• DOM code is excessively wordy
• DOM code requires a lot of typing

jQuery solves this problem by not being verbose.

The jQuery selector language is a mix. You can use:

• CSS 1-3 Selectors
• A basic XPath subset
• Both at the same time!

Some examples:

$("#foo")

Select the element with ID "foo"

$("ul.items ~ p")

Select preceding-sibling "p" elements of "ul" elements with class "items"

$("table/tr:odd")

Select the odd table rows in a table

Here are some ideas:

$("p").after("<hr/>")