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org.jsoup.select.Selector

2015-11-26 00:14 423 查看
org.jsoup.select.Selector

CSS-like element selector, that finds elements matching a query.

Selector syntax

A selector is a chain of simple selectors, separated by combinators. Selectors are case insensitive (including against elements, attributes, and attribute values).

The universal selector (*) is implicit when no element selector is supplied (i.e. 
*.header
and 
.header
is equivalent).

PatternMatchesExample
*
any element
*
tag
elements with the given tag name
div
ns|E
elements of type E in the namespace ns
fb|name
finds 
<fb:name>
elements
#id
elements with attribute ID of "id"
div#wrap
, 
#logo
.class
elements with a class name of "class"
div.left
, 
.result
[attr]
elements with an attribute named "attr" (with any value)
a[href]
, 
[title]
[^attrPrefix]
elements with an attribute name starting with "attrPrefix". Use to find elements with HTML5 datasets
[^data-]
, 
div[^data-]
[attr=val]
elements with an attribute named "attr", and value equal to "val"
img[width=500]
,
a[rel=nofollow]
[attr="val"]
elements with an attribute named "attr", and value equal to "val"
span[hello="Cleveland"][goodbye="Columbus"]
,
a[rel="nofollow"]
[attr^=valPrefix]
elements with an attribute named "attr", and value starting with "valPrefix"
a[href^=http:]
[attr$=valSuffix]
elements with an attribute named "attr", and value ending with "valSuffix"
img[src$=.png]
[attr*=valContaining]
elements with an attribute named "attr", and value containing "valContaining"
a[href*=/search/]
[attr~=regex]
elements with an attribute named "attr", and value matching the regular expression
img[src~=(?i)\\.(png|jpe?g)]
The above may be combined in any order
div.header[title]

Combinators

E F
an F element descended from an E element
div a
, 
.logo h1
E > F
an F direct child of E
ol > li
E + F
an F element immediately preceded by sibling E
li + li
, 
div.head + div
E ~ F
an F element preceded by sibling E
h1 ~ p
E, F, G
all matching elements E, F, or G
a[href], div, h3

Pseudo selectors

:lt(n)
elements whose sibling index is less than n
td:lt(3)
finds the first 3 cells of each row
:gt(n)
elements whose sibling index is greater thann
td:gt(1)
finds cells after skipping the first two
:eq(n)
elements whose sibling index is equal to n
td:eq(0)
finds the first cell of each row
:has(selector)
elements that contains at least one element matching the selector
div:has(p)
finds divs that contain p elements
:not(selector)
elements that do not match the selector. See also 
Elements.not(String)
div:not(.logo)
finds all divs that do not have the "logo" class.
div:not(:has(div))
finds divs that do not contain divs.

:contains(text)
elements that contains the specified text. The search is case insensitive. The text may appear in the found element, or any of its descendants.
p:contains(jsoup)
finds p elements containing the text "jsoup".
:matches(regex)
elements whose text matches the specified regular expression. The text may appear in the found element, or any of its descendants.
td:matches(\\d+)
finds table cells containing digits.
div:matches((?i)login)
finds divs containing the text, case insensitively.
:containsOwn(text)
elements that directly contain the specified text. The search is case insensitive. The text must appear in the found element, not any of its descendants.
p:containsOwn(jsoup)
finds p elements with own text "jsoup".
:matchesOwn(regex)
elements whose own text matches the specified regular expression. The text must appear in the found element, not any of its descendants.
td:matchesOwn(\\d+)
finds table cells directly containing digits. 
div:matchesOwn((?i)login)
finds divs containing the text, case insensitively.
The above may be combined in any order and with other selectors
.light:contains(name):eq(0)

Structural pseudo selectors

:root
The element that is the root of the document. In HTML, this is the 
html
element
:root
:nth-child(an+b)
elements that have 
an+b-1
siblings before it in the document tree, for any positive integer or zero value of 
n
, and has a parent element. For values of 
a
and 
b
greater than zero, this effectively divides the element's children into groups of a elements (the last group taking the remainder), and selecting the bth element of each group. For example, this allows the selectors to address every other row in a table, and could be used to alternate the color of paragraph text in a cycle of four. The 
a
and
b
values must be integers (positive, negative, or zero). The index of the first child of an element is 1.

In addition to this, 
:nth-child()
can take
odd
and 
even
as arguments instead. 
odd
has the same signification as 
2n+1
, and 
even
has the same signification as 
2n
.
tr:nth-child(2n+1)
finds every odd row of a table. 
:nth-child(10n-1)
the 9th, 19th, 29th, etc, element. 
li:nth-child(5)
the 5h li
:nth-last-child(an+b)
elements that have 
an+b-1
siblings after it in the document tree. Otherwise like 
:nth-child()
tr:nth-last-child(-n+2)
the last two rows of a table
:nth-of-type(an+b)
pseudo-class notation represents an element that has 
an+b-1
siblings with the same expanded element name before it in the document tree, for any zero or positive integer value of n, and has a parent element
img:nth-of-type(2n+1)
:nth-last-of-type(an+b)
pseudo-class notation represents an element that has 
an+b-1
siblings with the same expanded element name after it in the document tree, for any zero or positive integer value of n, and has a parent element
img:nth-last-of-type(2n+1)
:first-child
elements that are the first child of some other element.
div > p:first-child
:last-child
elements that are the last child of some other element.
ol > li:last-child
:first-of-type
elements that are the first sibling of its type in the list of children of its parent element
dl dt:first-of-type
:last-of-type
elements that are the last sibling of its type in the list of children of its parent element
tr > td:last-of-type
:only-child
elements that have a parent element and whose parent element hasve no other element children
:only-of-type
an element that has a parent element and whose parent element has no other element children with the same expanded element name
:empty
elements that have no children at all
Author:Jonathan Hedley, jonathan@hedley.netSee Also:Element.select(String)
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