我正在尝试从使用某个__doPostBack
功能的网站上抓取搜索结果。该网页显示每个搜索查询 10 个结果。要查看更多结果,必须单击触发__doPostBack
javascript 的按钮。经过一番研究,我意识到 POST 请求的行为就像一个表单,并且可以简单地使用 scrapyFormRequest
来填写该表单。我使用了以下线程:
使用带有javascript __doPostBack 方法的scrapy 的问题
编写以下脚本。
# -*- coding: utf-8 -*-
from scrapy.contrib.spiders import CrawlSpider
from scrapy.http import FormRequest
from scrapy.http import Request
from scrapy.selector import Selector
from ahram.items import AhramItem
import re
class MySpider(CrawlSpider):
name = u"el_ahram2"
def start_requests(self):
search_term = u'اقتصاد'
baseUrl = u'http://digital.ahram.org.eg/sresult.aspx?srch=' + search_term + u'&archid=1'
requests = []
for i in range(1, 4):#crawl first 3 pages as a test
argument = u"'Page$"+ str(i+1) + u"'"
data = {'__EVENTTARGET': u"'GridView1'", '__EVENTARGUMENT': argument}
currentPage = FormRequest(baseUrl, formdata = data, callback = self.fetch_articles)
requests.append(currentPage)
return requests
def fetch_articles(self, response):
sel = Selector(response)
for ref in sel.xpath("//a[contains(@href,'checkpart.aspx?Serial=')]/@href").extract():
yield Request('http://digital.ahram.org.eg/' + ref, callback=self.parse_items)
def parse_items(self, response):
sel = Selector(response)
the_title = ' '.join(sel.xpath("//title/text()").extract()).replace('\n','').replace('\r','').replace('\t','')#* mean 'anything'
the_authors = '---'.join(sel.xpath("//*[contains(@id,'editorsdatalst_HyperLink')]//text()").extract())
the_text = ' '.join(sel.xpath("//span[@id='TextBox2']/text()").extract())
the_month_year = ' '.join(sel.xpath("string(//span[@id = 'Label1'])").extract())
the_day = ' '.join(sel.xpath("string(//span[@id = 'Label2'])").extract())
item = AhramItem()
item["Authors"] = the_authors
item["Title"] = the_title
item["MonthYear"] = the_month_year
item["Day"] = the_day
item['Text'] = the_text
return item
我现在的问题是永远不会调用“fetch_articles”:
2014-05-27 12:19:12+0200 [scrapy] DEBUG: Web service listening on 0.0.0.0:6080
2014-05-27 12:19:13+0200 [el_ahram2] DEBUG: Crawled (200) <POST http://digital.ahram.org.eg/sresult.aspx?srch=%D8%A7%D9%82%D8%AA%D8%B5%D8%A7%D8%AF&archid=1> (referer: None)
2014-05-27 12:19:13+0200 [el_ahram2] DEBUG: Crawled (200) <POST http://digital.ahram.org.eg/sresult.aspx?srch=%D8%A7%D9%82%D8%AA%D8%B5%D8%A7%D8%AF&archid=1> (referer: None)
2014-05-27 12:19:13+0200 [el_ahram2] DEBUG: Crawled (200) <POST http://digital.ahram.org.eg/sresult.aspx?srch=%D8%A7%D9%82%D8%AA%D8%B5%D8%A7%D8%AF&archid=1> (referer: None)
2014-05-27 12:19:13+0200 [el_ahram2] INFO: Closing spider (finished)
搜索了几天后,我觉得完全卡住了。我是 python 的初学者,所以错误可能是微不足道的。但是,如果不是,此线程可能对许多人有用。预先感谢您的帮助。