:not(selector): find elements that do not match the selector e.g. ![]() ![]() :has(selector): find elements that contain elements matching the selector e.g.:eq(n): find elements whose sibling index is equal to n e.g.:gt(n): find elements whose sibling index is greater than n e.g.its position in the DOM tree relative to its parent) is less than n e.g. :lt(n): find elements whose sibling index (i.e.el, el, el: group multiple selectors, find unique elements that match any of the selectors e.g.siblingA ~ siblingX: finds sibling X element preceded by sibling A, e.g.siblingA siblingB: finds sibling B element immediately preceded by sibling A, e.g.div.content > p finds p elements and body > * finds the direct children of the body tag parent > child: child elements that descend directly from parent, e.g. ![]() ancestor child: child elements that descend from ancestor, e.g.body p finds p elements anywhere under a block with class "body".: elements with attribute values that match the regular expression e.g., , : elements with attributes that start with, end with, or contain the value, e.g.finds elements with HTML5 dataset attributes : elements with an attribute name prefix, e.g.class: find elements by class name, e.g.masthead ns|tag: find elements by tag in a namespace, e.g.Select returns a list of Elements (as Elements), which provides a range of methods to extract and manipulate the results. It is contextual, so you can filter by selecting from a specific element, or by chaining select calls. The select method is available in a Document, Element, or in Elements. Jsoup elements support a CSS (or jquery) like selector syntax to find matching elements, that allows very powerful and robust queries. Use the lect(String selector) and lect(String selector) methods: File input = new File("/tmp/input.html") ĭocument doc = Jsoup.parse(input, "UTF-8", "") Įlements links = doc.select("a") // a with hrefĮlements pngs = doc.select("img") Įlement masthead = doc.select("div.masthead").first() Įlements resultLinks = doc.select("h3.r > a") // direct a after h3 You want to find or manipulate elements using a CSS or jquery-like selector syntax. You'd use one of takeWhile, dropWhile, or dropWhileEnd in this case.Use selector-syntax to find elements Problem.This could be the core of a home-grown CSV parser (although you shouldn't have to write it - there's a library for that!) Select all elements from the beginning of a list of Char till you reach a delimiter, say.You want to stop selecting elements (basically terminate the iteration) as soon as a condition is met.You'd want to use take or takeEnd in this case. You want to extract the first (or last) N elements of a list (and N is independent of the contents of the list).You want to go through the entire list and decide whether the element should be present in the resultant list, or not.There are three general ways to filter / reject / select multiple elements from a Haskell list: Please fix the input data" else Right users Filtering / Rejecting / Selecting multiple elements from a Haskell list Let users = in if ( any (\(_, age) -> age 100) users) then Left "Some user has an incorrect age. Whereas in the case of find the result is a Maybe a because you don't know beforehand which element will match the given condition. In the case of elem the result is a Bool, since you've already specified the exact element you're searching for.elem implicitly uses the = operator to check for equality when searching for the given element, which is why there is an Eq a type-class constraint in its type-signature. ![]()
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