我已经尝试了大约一周的时间，以找出使用selenium2的下拉菜单。这是我正在使用ITA Matrix
2（http://matrix.itasoftware.com/）自动进行航班搜索的一个项目。一切正常，除了从下拉菜单中选择乘客人数。单击它可以正常工作，但是尝试向其发送键或箭头命令，以及尝试在弹出时创建的新ID都不会执行任何操作。感谢您的帮助！（我是python的新手，我正在做这个项目，是一种要学习的自学练习）。

from selenium import webdriver
from time import sleep
import time

driver = webdriver.Firefox()
driver.get("http://matrix.itasoftware.com/")


driver.find_element_by_id("advancedfrom1").send_keys(lport) #starting airport
driver.find_element_by_id("advancedto1").send_keys(rport) #destination airport
driver.find_element_by_id("advanced_rtDeparture").send_keys(ldate) #leaving date
driver.find_element_by_id("advanced_rtReturn").send_keys(rdate)    #return date
driver.find_element_by_id("ita_form_location_RouteLanguageTextBox_0").send_keys(lflight) #going flight number
driver.find_element_by_id("ita_form_location_RouteLanguageTextBox_1").send_keys(rflight) #return flight number

#problem code:


driver.find_element_by_id("ita_form_pax_Passenger_0").click()#.send_keys("2")
time.sleep(2)  #allow drop down to pop up

from selenium.webdriver.common.keys import Keys
driver.find_element_by_id("dijit_MenuItem_4_text").send_keys(Keys.DOWN)  #tried to scroll down
driver.find_element_by_id("ita_form_pax_Passenger_0").send_keys(Keys.DOWN)
#also tried just sending the number directly:
driver.find_element_by_id("dijit_MenuItem_4_text").send_keys(numpax)
driver.find_element_by_id("ita_form_pax_Passenger_0").send_keys(numpax)