Support optional passing of arguments to execute/evaluate_script

lib/capybara/driver/base.rb

@@ -28,11 +28,11 @@ class Capybara::Driver::Base
     raise Capybara::NotSupportedByDriverError, 'Capybara::Driver::Base#go_forward'
   end
 
-  def execute_script(script)
+  def execute_script(script, *args)
     raise Capybara::NotSupportedByDriverError, 'Capybara::Driver::Base#execute_script'
   end
 
-  def evaluate_script(script)
+  def evaluate_script(script, *args)
     raise Capybara::NotSupportedByDriverError, 'Capybara::Driver::Base#evaluate_script'
   end
 

lib/capybara/selenium/driver.rb

@@ -86,12 +86,12 @@ class Capybara::Selenium::Driver < Capybara::Driver::Base
   def wait?; true; end
   def needs_server?; true; end
 
-  def execute_script(script)
-    browser.execute_script script
+  def execute_script(script, *args)
+    browser.execute_script script, *args
   end
 
-  def evaluate_script(script)
-    browser.execute_script "return #{script}"
+  def evaluate_script(script, *args)
+    browser.execute_script "return #{script}", *args
   end
 
   def save_screenshot(path, _options={})

lib/capybara/session.rb

@@ -602,10 +602,16 @@ module Capybara
     # +evaluate_script+ whenever possible.
     #
     # @param [String] script   A string of JavaScript to execute
+    # @param args  Optional arguments that will be passed to the script.  Driver support for this is optional and types of objects supported may differ between drivers
     #
-    def execute_script(script)
+    def execute_script(script, *args)
       @touched = true
-      driver.execute_script(script)
+      if driver.method(:execute_script).arity == 1
+        raise Capybara::NotSupportedByDriverError, "The current driver does not support arguments being passed with execute_script" unless args.empty?
+        driver.execute_script(script)
+      else
+        driver.execute_script(script, *args.map { |arg| arg.is_a?(Capybara::Node::Element) ?  arg.native : arg} )
+      end
     end
 
     ##
@@ -617,9 +623,14 @@ module Capybara
     # @param  [String] script   A string of JavaScript to evaluate
     # @return [Object]          The result of the evaluated JavaScript (may be driver specific)
     #
-    def evaluate_script(script)
+    def evaluate_script(script, *args)
       @touched = true
-      driver.evaluate_script(script)
+      if driver.method(:evaluate_script).arity == 1
+        raise Capybara::NotSupportedByDriverError, "The current driver does not support arguments being passed with execute_script" unless args.empty?
+        driver.evaluate_script(script)
+      else
+        driver.evaluate_script(script, *args.map { |arg| arg.is_a?(Capybara::Node::Element) ?  arg.native : arg} )
+      end
     end
 
     ##

lib/capybara/spec/session/evaluate_script_spec.rb

@@ -4,4 +4,18 @@ Capybara::SpecHelper.spec "#evaluate_script", requires: [:js] do
     @session.visit('/with_js')
     expect(@session.evaluate_script("1+3")).to eq(4)
   end
+
+  it "should pass arguments to the script" do
+    @session.visit('/with_js')
+    @session.evaluate_script("document.getElementById('change').textContent = arguments[0]", "Doodle Funk")
+    expect(@session).to have_css('#change', text: 'Doodle Funk')
+  end
+
+  it "should support passing elements as arguments to the script" do
+    @session.visit('/with_js')
+    el = @session.find(:css, '#change')
+    @session.evaluate_script("arguments[0].textContent = arguments[1]", el, "Doodle Funk")
+    expect(@session).to have_css('#change', text: 'Doodle Funk')
+  end
+
 end

lib/capybara/spec/session/execute_script_spec.rb

@@ -10,4 +10,17 @@ Capybara::SpecHelper.spec "#execute_script", requires: [:js] do
     @session.visit('/with_js')
     expect{ @session.execute_script("$('#change').text('Funky Doodle')") }.not_to raise_error
   end
+
+  it "should pass arguments to the script" do
+    @session.visit('/with_js')
+    @session.execute_script("document.getElementById('change').textContent = arguments[0]", "Doodle Funk")
+    expect(@session).to have_css('#change', text: 'Doodle Funk')
+  end
+
+  it "should support passing elements as arguments to the script" do
+    @session.visit('/with_js')
+    el = @session.find(:css, '#change')
+    @session.execute_script("arguments[1].textContent = arguments[0]", "Doodle Funk", el)
+    expect(@session).to have_css('#change', text: 'Doodle Funk')
+  end
 end