折腾：
【已解决】Python中Selenium中如何实现模拟点击按钮
期间，一行行调试代码：
#!/usr/bin/python # -*- coding: utf-8 -*- from selenium import webdriver from selenium.webdriver.common.keys import Keys driver = webdriver.Chrome() url = ‘http://www.baidu.com/‘ driver.get(url) print “driver.title=%s”%(driver.title) assert u”百度” in driver.title searchElement = driver.find_element_by_name(“wd”) searchElement.send_keys(“crifan”) searchElement.send_keys(Keys.RETURN) print “searchElement=%s”%(searchElement) # print driver.page_source nextPageElement = driver.find_element_by_class_name(“n”) print “nextPageElement=%s”%(nextPageElement) nextPageElement.send_keys(Keys.ENTER) |
是可以正常运行，不会报错的。
但是直接运行，没有调试（的暂停，的等待时间），则就会报错：
searchElement=<selenium.webdriver.remote.webelement.WebElement (session=”1e22e51571ade5e2b5d0b513a4281f47″, element=”0.034347571190473936-1″)> Traceback (most recent call last): File “/Applications/PyCharm.app/Contents/helpers/pydev/pydevd.py”, line 1596, in <module> globals = debugger.run(setup[‘file’], None, None, is_module) File “/Applications/PyCharm.app/Contents/helpers/pydev/pydevd.py”, line 974, in run pydev_imports.execfile(file, globals, locals) # execute the script File “/Users/crifan/dev/dev_root/projects/亚马逊/自动下单/AutoOrder/AutoOrder.py”, line 17, in <module> nextPageElement = driver.find_element_by_class_name(“n”) File “/usr/local/lib/python2.7/site-packages/selenium/webdriver/remote/webdriver.py”, line 485, in find_element_by_class_name return self.find_element(by=By.CLASS_NAME, value=name) File “/usr/local/lib/python2.7/site-packages/selenium/webdriver/remote/webdriver.py”, line 855, in find_element ‘value’: value})[‘value’] File “/usr/local/lib/python2.7/site-packages/selenium/webdriver/remote/webdriver.py”, line 308, in execute self.error_handler.check_response(response) File “/usr/local/lib/python2.7/site-packages/selenium/webdriver/remote/errorhandler.py”, line 194, in check_response raise exception_class(message, screen, stacktrace) selenium.common.exceptions.NoSuchElementException: Message: no such element: Unable to locate element: {“method”:”class name”,”selector”:”n”} (Session info: chrome=61.0.3163.100) (Driver info: chromedriver=2.33.506106 (8a06c39c4582fbfbab6966dbb1c38a9173bfb1a2),platform=Mac OS X 10.12.6 x86_64) |
很明显，页面没有加载完毕，就运行了，而调试期间的间隔时间，则是等页面加载完毕，所以不会报错，可以找到元素的。
别人这种：
直接加sleep，虽然临时可以，但是效率太低，而且不够稳定和严谨
selenium.common.exceptions.NoSuchElementException: Message no such element: Unable to locate element
可以这样写click的：
<code>driver.find_element_by_xpath("//div[. = 'Sign in']").click()
driver.find_element_by_id("signin").click()
</code>Python with selenium: unable to locate element which really exist – Stack Overflow
好像这个WebDriverWait思路是对的：
去找找
selenium wait until
WebDriver: Advanced Usage — Selenium Documentation
5. Waits — Selenium Python Bindings 2 documentation
java – How to wait until an element is present in Selenium? – Stack Overflow
http://toolsqa.com/selenium-webdriver/wait-commands/
【总结】
通过代码：
#!/usr/bin/python # -*- coding: utf-8 -*- from selenium import webdriver from selenium.webdriver.common.keys import Keys from selenium.webdriver.common.by import By from selenium.webdriver.support.ui import WebDriverWait # available since 2.4.0 from selenium.webdriver.support import expected_conditions as EC # available since 2.26.0 import time driver = webdriver.Chrome() url = ‘http://www.baidu.com/‘ driver.get(url) print “driver.title=%s”%(driver.title) assert u”百度” in driver.title searchElement = driver.find_element_by_name(“wd”) searchElement.send_keys(“crifan”) searchElement.send_keys(Keys.RETURN) print “searchElement=%s”%(searchElement) # print driver.page_source try: print “before wait: %s”%(time.strftime(‘%Y%m%d %H:%M:%S’,time.localtime(time.time()))) nextPageElement = WebDriverWait(driver, 10).until(EC.presence_of_element_located((By.CLASS_NAME, “n”))) print “after wait: %s”%(time.strftime(‘%Y%m%d %H:%M:%S’,time.localtime(time.time()))) except: print u”can not find 下一页” driver.quit() # nextPageElement = driver.find_element_by_class_name(“n”) print “nextPageElement=%s”%(nextPageElement) nextPageElement.send_keys(Keys.ENTER) |
然后就可以正常的，用WebDriverWait等到页面去加载，直到出现了class name为n的“下一页”的按钮：
通过log：
driver.title=百度一下，你就知道 searchElement=<selenium.webdriver.remote.webelement.WebElement (session=”487c5c8eecf619a6fd4216e30d617eb3″, element=”0.1463384739209479-1″)> before wait: 20171109 23:18:00 after wait: 20171109 23:18:01 nextPageElement=<selenium.webdriver.remote.webelement.WebElement (session=”487c5c8eecf619a6fd4216e30d617eb3″, element=”0.1463384739209479-2″)> |
可以看出：
此处从百度搜索页面结果显示，到显示出下一页，都在1秒左右（以内）
-》换句话说，程序的代码去处理的话，都还是很快的
然后再模拟点击，加载下一页了：
转载请注明：在路上 » 【已解决】Python的Selenium中直接运行会报错：selenium.common.exceptions.NoSuchElementException Message no such element Unable to locate element