HTML and CSS Reference
In-Depth Information
(Filters are always prepended with a colon; this is therefore combining two selectors, one
to select
tr
elements, and then another limiting the selection to
tr
elements that are in the
first position amongst their siblings.)
Filters can also accept parameters; therefore we can find any arbitrary row in the table using
the following filter:
> $('tr:eq(1)')
This will find the second row in the table (counting starts at 0).
Alternatively we may wish to find any row except the first row, so we could use the fol-
lowing filter:
> $('tr:gt(0)')
This is selecting all rows with a position greater than 0.
Other useful filters are as follows:
•
:even
finds all even numbered elements in a selection.
•
:odd
finds all odd numbered elements in a selection.
•
:not(selection)
finds all elements that do not match the selection.
•
:checked
finds radio buttons or check boxes that are checked.
•
:selected
finds options in select boxes that are selected.
•
:contains(text)
finds elements that contain a given piece of text.
•
:empty
finds all elements that have no children.
•
:focus
finds the element that currently has focus.
•
:last
finds the last element in a set.
In addition, filters can simplify the process of selecting input elements. Since most input
fields use the element type of
input
, it is necessary to also query on the attribute
type
.
jQuery contains the following filters for finding specific types of input field:
• :hidden
• :text
• :checkbox
• :password
• :radio
