method

css_select

v3.2.13 - Show latest stable - 0 notes - Class: ActionDispatch::Assertions::SelectorAssertions

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What's this?

css_select(*args) public

Select and return all matching elements.

If called with a single argument, uses that argument as a selector to match all elements of the current page. Returns an empty array if no match is found.

If called with two arguments, uses the first argument as the base element and the second argument as the selector. Attempts to match the base element and any of its children. Returns an empty array if no match is found.

The selector may be a CSS selector expression (String), an expression with substitution values (Array) or an HTML::Selector object.

Examples

# Selects all div tags
divs = css_select("div")

# Selects all paragraph tags and does something interesting
pars = css_select("p")
pars.each do |par|
  # Do something fun with paragraphs here...
end

# Selects all list items in unordered lists
items = css_select("ul>li")

# Selects all form tags and then all inputs inside the form
forms = css_select("form")
forms.each do |form|
  inputs = css_select(form, "input")
  ...
end

Show source

# File actionpack/lib/action_dispatch/testing/assertions/selector.rb, line 62
      def css_select(*args)
        # See assert_select to understand what's going on here.
        arg = args.shift

        if arg.is_a?(HTML::Node)
          root = arg
          arg = args.shift
        elsif arg == nil
          raise ArgumentError, "First argument is either selector or element to select, but nil found. Perhaps you called assert_select with an element that does not exist?"
        elsif defined?(@selected) && @selected
          matches = []

          @selected.each do |selected|
            subset = css_select(selected, HTML::Selector.new(arg.dup, args.dup))
            subset.each do |match|
              matches << match unless matches.any? { |m| m.equal?(match) }
            end
          end

          return matches
        else
          root = response_from_page
        end

        case arg
          when String
            selector = HTML::Selector.new(arg, args)
          when Array
            selector = HTML::Selector.new(*arg)
          when HTML::Selector
            selector = arg
          else raise ArgumentError, "Expecting a selector as the first argument"
        end

        selector.select(root)
      end

css_select

Related methods

Examples