class Capybara::Node::Base
A {Capybara::Node::Base} represents either an element on a page through the subclass {Capybara::Node::Element} or a document through {Capybara::Node::Document}.
Both types of Node share the same methods, used for interacting with the elements on the page. These methods are divided into three categories, finders, actions and matchers. These are found in the modules {Capybara::Node::Finders}, {Capybara::Node::Actions} and {Capybara::Node::Matchers} respectively.
A {Capybara::Session} exposes all methods from {Capybara::Node::Document} directly:
session = Capybara::Session.new(:rack_test, my_app) session.visit('/') session.fill_in('Foo', with: 'Bar') # from Capybara::Node::Actions bar = session.find('#bar') # from Capybara::Node::Finders bar.select('Baz', from: 'Quox') # from Capybara::Node::Actions session.has_css?('#foobar') # from Capybara::Node::Matchers
Attributes
Public Class Methods
# File lib/capybara/node/base.rb, line 31 def initialize(session, base) @session = session @base = base end
Public Instance Methods
@api private
# File lib/capybara/node/base.rb, line 101 def find_css(css) base.find_css(css) end
@api private
# File lib/capybara/node/base.rb, line 106 def find_xpath(xpath) base.find_xpath(xpath) end
@deprecated Use #query_scope instead
# File lib/capybara/node/base.rb, line 111 def parent warn "DEPRECATED: #parent is deprecated in favor of #query_scope - Note: #parent was not the elements parent in the document so it's most likely not what you wanted anyway" query_scope end
overridden in subclasses, e.g. Capybara::Node::Element
# File lib/capybara/node/base.rb, line 37 def reload self end
@api private
# File lib/capybara/node/base.rb, line 117 def session_options session.config end
This method is Capybara's primary defence against asynchronicity problems. It works by attempting to run a given block of code until it succeeds. The exact behaviour of this method depends on a number of factors. Basically there are certain exceptions which, when raised from the block, instead of bubbling up, are caught, and the block is re-run.
Certain drivers, such as RackTest, have no support for asynchronous processes, these drivers run the block, and any error raised bubbles up immediately. This allows faster turn around in the case where an expectation fails.
Only exceptions that are {Capybara::ElementNotFound} or any subclass thereof cause the block to be rerun. Drivers may specify additional exceptions which also cause reruns. This usually occurs when a node is manipulated which no longer exists on the page. For example, the Selenium driver specifies `Selenium::WebDriver::Error::ObsoleteElementError`.
As long as any of these exceptions are thrown, the block is re-run, until a certain amount of time passes. The amount of time defaults to {Capybara.default_max_wait_time} and can be overridden through the `seconds` argument. This time is compared with the system time to see how much time has passed. On rubies/platforms which don't support access to a monotonic process clock if the return value of `Time.now` is stubbed out, Capybara will raise `Capybara::FrozenInTime`.
@param [Integer] seconds Number of seconds to retry this block @param options [Hash] @option options [Array<Exception>] :errors (driver.invalid_element_errors +
[Capybara::ElementNotFound]) exception types that cause the block to be rerun
@return [Object] The result of the given block @raise [Capybara::FrozenInTime] If the return value of `Time.now` appears stuck
# File lib/capybara/node/base.rb, line 76 def synchronize(seconds=session_options.default_max_wait_time, options = {}) start_time = Capybara::Helpers.monotonic_time if session.synchronized yield else session.synchronized = true begin yield rescue => e session.raise_server_error! raise e unless driver.wait? raise e unless catch_error?(e, options[:errors]) raise e if (Capybara::Helpers.monotonic_time - start_time) >= seconds sleep(0.05) raise Capybara::FrozenInTime, "time appears to be frozen, Capybara does not work with libraries which freeze time, consider using time travelling instead" if Capybara::Helpers.monotonic_time == start_time reload if session_options.automatic_reload retry ensure session.synchronized = false end end end
Protected Instance Methods
# File lib/capybara/node/base.rb, line 123 def catch_error?(error, errors = nil) errors ||= (driver.invalid_element_errors + [Capybara::ElementNotFound]) errors.any? do |type| error.is_a?(type) end end
# File lib/capybara/node/base.rb, line 130 def driver session.driver end