teamcapybara/capybara · error · ArgumentError

Capybara was unable to determine the file input you're attac

Error message

Capybara was unable to determine the file input you're attaching to

What it means

Error "Capybara was unable to determine the file input you're attaching to" thrown in teamcapybara/capybara.

Source

Thrown at lib/capybara/node/actions.rb:294

      #   @param [String, Array<String>] paths     The path(s) of the file(s) that will be attached
      #   @yield Block whose actions will trigger the system file chooser to be shown
      # @return [Capybara::Node::Element]  The file field element
      def attach_file(locator = nil, paths, make_visible: nil, **options) # rubocop:disable Style/OptionalArguments
        if locator && block_given?
          raise ArgumentError, '`#attach_file` does not support passing both a locator and a block'
        end

        Array(paths).each do |path|
          raise Capybara::FileNotFound, "cannot attach file, #{path} does not exist" unless File.exist?(path.to_s)
        end
        options[:allow_self] = true if locator.nil?

        if block_given?
          begin
            execute_script CAPTURE_FILE_ELEMENT_SCRIPT
            yield
            file_field = evaluate_script 'window._capybara_clicked_file_input'
            raise ArgumentError, "Capybara was unable to determine the file input you're attaching to" unless file_field
          rescue ::Capybara::NotSupportedByDriverError
            warn 'Block mode of `#attach_file` is not supported by the current driver - ignoring.'
          end
        end
        # Allow user to update the CSS style of the file input since they are so often hidden on a page
        if make_visible
          ff = file_field || find(:file_field, locator, **options.merge(visible: :all))
          while_visible(ff, make_visible) { |el| el.set(paths) }
        else
          (file_field || find(:file_field, locator, **options)).set(paths)
        end
      end

    private

      def find_select_or_datalist_input(from, options)
        synchronize(Capybara::Queries::BaseQuery.wait(options, session_options.default_max_wait_time)) do
          find(:select, from, **options)

View on GitHub (pinned to 15b5fdb76e)

When it happens

Trigger: Thrown at lib/capybara/node/actions.rb:294 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of teamcapybara/capybara@15b5fdb76e (2026-08-21). Data as JSON: /api/errors/f11276f92f995380. Report an issue: GitHub.