instance method `select_first`

Ruby on Rails 3.1.12

Since v2.2.3 Last seen in v4.1.16

Available in: v2.2.3 v2.3.18 v3.0.20 v3.1.12 v3.2.22.5 v4.0.13 v4.1.16

Compare with:

select_first(root)

Similar to #select but returns the first matching element. Returns nil if no element matches the selector.

Parameters

root req

Source

# File actionpack/lib/action_controller/vendor/html-scanner/html/selector.rb, line 473
    def select_first(root)
      stack = [root]
      while node = stack.pop
        if node.tag? && subset = match(node, true)
          return subset.first if !subset.empty?
        elsif children = node.children
          stack.concat children.reverse
        end
      end
      nil
    end

Defined in actionpack/lib/action_controller/vendor/html-scanner/html/selector.rb line 473 · View on GitHub · Improve this page · Find usages on GitHub

Defined in HTML::Selector

Signature

Parameters