如何编写适当的Xpath来定位文本值 [英] How to write appropriate Xpath to locate text value

问题描述

我正尝试使用python，selenium和xpath在以下HTML块中抓取$ 0.180的文本，

 < div class ="wlp-values-div">< span class ="wlp-last-price-span"> $ 0.180</span> 

此代码深入到网站HTML中，我尝试使用以下Xpath进行定位:

 导入时间从硒导入webdriver从selenium.webdriver.common.keys导入密钥驱动程序= webdriver.Chrome()driver.get("https://smallcaps.com.au/stocks/?symbol=AWJ")time.sleep(3)webdriver.ActionChains(驱动程序).send_keys(Keys.ESCAPE).perform()ele = driver.find_element_by_xpath("//div [@ class ='wlp-values-div']/span [@ class ='wlp-last-price-span']") 

但是我收到错误消息:

  NoSuchElementException:消息:没有这样的元素:无法找到元素:{方法":"xpath"，选择器":"//div [@ class ='wlp-values-div']/span [@ class ='wlp-last-price-span']'} 

任何帮助将不胜感激

解决方案

最后价格字段位于嵌套的< iframe> 元素内，因此您必须:

• 引发 WebDriverWait 使父级 框架可用并切换到.

• 引发 WebDriverWait 为子 框架可用并切换到.

• 引发 WebDriverWait 使所需的元素可见.

• 您可以使用以下定位器策略:

  • 使用 CSS_SELECTOR :

      driver.get('https://smallcaps.com.au/stocks/?symbol=AWJ')WebDriverWait(driver，20).until(EC.element_to_be_clickable((By.CSS_SELECTOR，``svg [data-name ='close']'''')))).click()WebDriverWait(驱动程序，20).until(EC.frame_to_be_available_and_switch_to_it((By.CSS_SELECTOR，``iframe#wl-summary''))))WebDriverWait(驱动程序，20).until(EC.frame_to_be_available_and_switch_to_it((By.CSS_SELECTOR，"iframe.wl-quote-frame")))print(WebDriverWait(driver，20).until(EC.visibility_of_element_located((By.CSS_SELECTOR，"span.wlp-last-price-span"))).get_attribute("innerHTML"))driver.quit() 

  • 使用 XPATH :

      driver.get('https://smallcaps.com.au/stocks/?symbol=AWJ')WebDriverWait(driver，20).until(EC.element_to_be_clickable((By.XPATH，``//* [name()='svg'and @ data-name ='close']'''''))).click()WebDriverWait(驱动程序，20).until(EC.frame_to_be_available_and_switch_to_it((By.XPATH，"//iframe [@ id ='wl-summary']")))WebDriverWait(驱动程序，20).until(EC.frame_to_be_available_and_switch_to_it((By.XPATH，"//iframe [@ class ='wl-quote-frame']"))))print(WebDriverWait(驱动程序，20).until(EC.visibility_of_element_located((By.XPATH，"//span[@class='wlp-last-price-span']")))).get_attribute("innerHTML";))driver.quit() 

• 注意:您必须添加以下导入:

  从selenium.webdriver.support.ui中的

   导入WebDriverWait来自selenium.webdriver.common.by导入方式从selenium.webdriver.support导入EC的预期条件 

• 控制台输出:

    $ 0.190 

您可以在在iframe下处理#document的方式

通过Selenium和python切换到iframe

selenium.common.exceptions.NoSuchElementException:消息:没有这样的元素:尝试单击带有硒的下一步按钮时找不到元素

Python中的硒:NoSuchElementException:消息:没有这样的元素:无法找到元素

I am trying to use python, selenium and xpath to grab the text $0.180 in the following block of HTML,

<div class="wlp-values-div">
  <span class="wlp-last-price-span">$0.180</span>

This code is deep into a websites HTML and I tried to use the following Xpath to locate it:

import time
from selenium import webdriver
from selenium.webdriver.common.keys import Keys

driver = webdriver.Chrome()
driver.get("https://smallcaps.com.au/stocks/?symbol=AWJ")
time.sleep(3)
webdriver.ActionChains(driver).send_keys(Keys.ESCAPE).perform()

ele = driver.find_element_by_xpath("//div[@class='wlp-values-div']/span[@class='wlp-last-price-span']")

But I receive the error:

NoSuchElementException: Message: no such element: Unable to locate element: {"method":"xpath","selector":"//div[@class='wlp-values-div']/span[@class='wlp-last-price-span']"}

Any help would be greatly appreciated

解决方案

The last price field is within nested <iframe> elements so you have to:

• Induce WebDriverWait for the parent frame to be available and switch to it.

• Induce WebDriverWait for the child frame to be available and switch to it.

• Induce WebDriverWait for the desired element to be visible.

• You can use either of the following Locator Strategies:

  • Using CSS_SELECTOR:

    driver.get('https://smallcaps.com.au/stocks/?symbol=AWJ')
    WebDriverWait(driver, 20).until(EC.element_to_be_clickable((By.CSS_SELECTOR, "svg[data-name='close']"))).click()
    WebDriverWait(driver, 20).until(EC.frame_to_be_available_and_switch_to_it((By.CSS_SELECTOR,"iframe#wl-summary")))
    WebDriverWait(driver, 20).until(EC.frame_to_be_available_and_switch_to_it((By.CSS_SELECTOR,"iframe.wl-quote-frame")))
    print(WebDriverWait(driver, 20).until(EC.visibility_of_element_located((By.CSS_SELECTOR, "span.wlp-last-price-span"))).get_attribute("innerHTML"))
    driver.quit()
    

  • Using XPATH:

    driver.get('https://smallcaps.com.au/stocks/?symbol=AWJ')
    WebDriverWait(driver, 20).until(EC.element_to_be_clickable((By.XPATH, "//*[name()='svg' and @data-name='close']"))).click()
    WebDriverWait(driver, 20).until(EC.frame_to_be_available_and_switch_to_it((By.XPATH,"//iframe[@id='wl-summary']")))
    WebDriverWait(driver, 20).until(EC.frame_to_be_available_and_switch_to_it((By.XPATH,"//iframe[@class='wl-quote-frame']")))
    print(WebDriverWait(driver, 20).until(EC.visibility_of_element_located((By.XPATH, "//span[@class='wlp-last-price-span']"))).get_attribute("innerHTML"))
    driver.quit()
    

• Note : You have to add the following imports :

   from selenium.webdriver.support.ui import WebDriverWait
   from selenium.webdriver.common.by import By
   from selenium.webdriver.support import expected_conditions as EC
  

• Console Output:

    $0.190
  

You can find a detailed relevant discussion in How To sign in to Applemusic With Python Using Chrome Driver With Selenium

---

Reference

You can find a couple of relevant discussions in:

• Ways to deal with #document under iframe
• Switch to an iframe through Selenium and python
• selenium.common.exceptions.NoSuchElementException: Message: no such element: Unable to locate element while trying to click Next button with selenium
• selenium in python : NoSuchElementException: Message: no such element: Unable to locate element

这篇关于如何编写适当的Xpath来定位文本值的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！