点击后抓取.aspx网站答案

【问题标题】：Scraping .aspx site after click点击后抓取.aspx网站
【发布时间】：2019-08-21 00:36:55
【问题描述】：

我正在尝试从以下位置为我的中队抓取调度数据： https://www.cnatra.navy.mil/scheds/schedule_data.aspx?sq=vt-9

我已经弄清楚如何使用 BeautifulSoup 提取数据：

import urllib2
from urllib2 import urlopen
import bs4 as bs

url = 'https://www.cnatra.navy.mil/scheds/schedule_data.aspx?sq=vt-9'
html = urllib2.urlopen(url).read()
soup = bs.BeautifulSoup(html, 'lxml')
table = soup.find('table')
print(table.text)

但是，表格隐藏在选定日期（如果不是当天）和按下“查看计划”按钮的下方。

如何修改我的代码以“按下”“查看计划”按钮，以便随后抓取数据？如果代码还可以选择日期，则可以加分！

我尝试使用：

import urllib2
from urllib2 import urlopen
import bs4 as bs
from selenium import webdriver

driver = webdriver.Chrome("/users/base/Downloads/chromedriver")
driver.get("https://www.cnatra.navy.mil/scheds/schedule_data.aspx?sq=vt-9")
button = driver.find_element_by_id('btnViewSched')
button.click()

成功打开 Chrome 并“点击”按钮，但由于地址未更改，我无法从中抓取。

【问题讨论】：

标签： python asp.net selenium beautifulsoup screen-scraping

【解决方案1】：

你可以使用纯selenium获取日程：

from selenium import webdriver

driver = webdriver.Chrome('chromedriver.exe')
driver.get("https://www.cnatra.navy.mil/scheds/schedule_data.aspx?sq=vt-9")
button = driver.find_element_by_id('btnViewSched')
button.click()
print(driver.find_element_by_id('dgEvents').text)

输出：

TYPE VT Brief EDT RTB Instructor Student Event Hrs Remarks Location
Flight VT-9 07:45 09:45 11:15 JARVIS, GRANT M [LT] LENNOX, KEVIN I [ENS] BI4101 1.5 2 HR BRIEF MASS BRIEF  
Flight VT-9 07:45 09:45 11:15 MOYNAHAN, WILLIAM P [CDR] FINNERAN, MATTHEW P [1stLt] BI4101 1.5 2 HR BRIEF MASS BRIEF  
Flight VT-9 07:45 12:15 13:45 JARVIS, GRANT M [LT] TAYLOR, ADAM R [1stLt] BI4101 1.5 2 HR BRIEF MASS BRIEF @ 0745 W/ JARVIS MEI OPS  
Flight VT-9 07:45 12:15 13:45 MOYNAHAN, WILLIAM P [CDR] LOW, TRENTON G [ENS] BI4101 1.5 2 HR BRIEF MASS BRIEF @ 0745 W/ MOYNAHAN MEI OPS  
Watch VT-9   00:00 14:00 ANDERSON, LAURA [LT]   ODO (ON CALL) 14.0    
Watch VT-9   00:00 14:00 ANDERSON, LAURA [LT]   ODO (ON CALL) 14.0    
Watch VT-9   00:00 23:59 ANDERSON, LAURA [LT]   ODO (ON CALL) 24.0    
Watch VT-9   00:00 23:59 ANDERSON, LAURA [LT]   ODO (ON CALL) 24.0    
Watch VT-9   07:00 19:00   STUY, JOHN [LTJG] DAY IWO 12.0    
Watch VT-9   19:00 07:00   STRACHAN, ALLYSON [LTJG] IWO 12.0

【讨论】：

@exos 什么是“人造铬”？

【解决方案2】：

当我阅读您的问题时，您需要使用 selenium 来抓取需要输入的 .aspx 页面。

阅读这篇文章会帮助你scrape data for .aspx page with selenium

【讨论】：

【解决方案3】：

点击“查看时间表”，请求使用相同的 url 但数据btnViewSched=View Schedule 并发送令牌。这里的代码，以地图列表格式收集表格数据：

import requests
from bs4 import BeautifulSoup

headers = {
    'Connection': 'keep-alive',
    'Cache-Control': 'max-age=0',
    'Upgrade-Insecure-Requests': '1',
    'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_4) AppleWebKit/537.36 (KHTML, like Gecko) '
                  'Chrome/73.0.3683.86 Safari/537.36',
    'DNT': '1',
    'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,'
              'application/signed-exchange;v=b3',
    'Accept-Encoding': 'gzip, deflate, br',
    'Accept-Language': 'ru,en-US;q=0.9,en;q=0.8,tr;q=0.7',
}
response = requests.get('https://www.cnatra.navy.mil/scheds/schedule_data.aspx?sq=vt-9', headers=headers)
assert response.ok

page = BeautifulSoup(response.text, "lxml")
# get __VIEWSTATE, __EVENTVALIDATION and __VIEWSTATEGENERATOR for further requests
__VIEWSTATE = page.find("input", attrs={"id": "__VIEWSTATE"}).attrs["value"]
__EVENTVALIDATION = page.find("input", attrs={"id": "__EVENTVALIDATION"}).attrs["value"]
__VIEWSTATEGENERATOR = page.find("input", attrs={"id": "__VIEWSTATEGENERATOR"}).attrs["value"]

# View Schedule click set here
data = {
  '__EVENTTARGET': '',
  '__EVENTARGUMENT': '',
  '__VIEWSTATE': __VIEWSTATE,
  '__VIEWSTATEGENERATOR': __VIEWSTATEGENERATOR,
  '__EVENTVALIDATION': __EVENTVALIDATION,
  'btnViewSched': 'View Schedule',
  'txtNameSearch': ''
}
# request with params
response = requests.post('https://www.cnatra.navy.mil/scheds/schedule_data.aspx?sq=vt-9', headers=headers, data=data)
assert response.ok

page = BeautifulSoup(response.text, "lxml")
# get table headers to map as a keys in result
table_headers = [td.text.strip() for td in page.select("#dgEvents tr:first-child td")]
# get all rows, without table headers
table_rows = page.select("#dgEvents tr:not(:first-child)")

result = []
for row in table_rows:
    table_columns = row.find_all("td")

    # use map with results for row and add all columns as map (key:value)
    row_result = {}
    for i in range(0, len(table_headers)):
        row_result[table_headers[i]] = table_columns[i].text.strip()

    # add row_result to result list
    result.append(row_result)

for r in result:
    print(r)

print("the end")

示例输出：

{'TYPE': 'Flight', 'VT': 'VT-9', 'Brief': '07:45', 'EDT': '09:45', 'RTB': '11:15 '，'讲师'：'JARVIS，GRANT M [LT]'，'学生'：'LENNOX，KEVIN I [ENS]'，'事件'：'BI4101'，'小时'：'1.5'，'备注'： '2 HR Brief MASS Brief', '位置': ''}

【讨论】：