Gareth,
http://www.prototypejs.org/api/array/first
and
http://www.prototypejs.org/api/array/last
should do the trick.
The problem arises when you need to access next element in a
collection. Consider this example:
$$('input[type=text]').invoke('observe', 'keypress', function(e) {
if (Event.KEY_TAB == e.keyCode) {
// focus next element in collection
}
})
Inside a callback we could resort to this.next('input[type=text]'),
but this unfortunately will not work if input elements are not in a
linear order
One way to make it happen is by storing index of a current element in
a closure and focusing the element with index = index + 1 when the key
is pressed
$$('input[type=text]').each(function(el, index) {
el.observe('keypress', function(e)) {
if (Event.KEY_TAB == e.keyCode) {
$$('input[type=text]')[index+1].focus()
}
}
})
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