- It attaches a click eventhandler to every
<button>
tag. - In the handler it extracts the "foo" from the button's id attribute if it is for example "bar[foo]".
- It animates a page scroll to the postition of the element with the "foo" id (the "[id=...]" jQuery selector).
The string.split
is a string function which splits the string into an array based on the given separator, here "[" and then "]", check the documentation.
Briefly, the offset()
jQuery function returns the top and left pixel coordinates of the first element matched by the given selector, check the documentation.
So as a result, when you click a <button>
with id "bar[foo]", the page will do an animated vertical scroll so that the element with id "foo" will be at the top or the window.