在硒python中使用xpath

Question

我在Firefox中使用firebug來獲取未分配ID的鏈接的xpath。 該鏈接是一個以圖片為實際按鈕的javascript鏈接。 我希望能夠單擊此鏈接，但是它不起作用。

實際的xpath是'/ html / body / div [2] / div / div / div [3] / div / div / table / tbody / tr [1] / td [2] / form / table / tbody / tr [ 1] / td / div [1] / div / table / thead / tr [2] / th [1] / a / img'

from selenium import webdriver
from selenium.webdriver.common.keys import Keys
driver = webdriver.Firefox()

URL = 'http://example.com'

driver.set_window_size(1024, 768)
driver.get(url)

link = driver.find_element_by_xpath(//*[@id="//html/body/div[2]/div/div/div[3]/div/div/‌​table/tbody/tr[1]/td[2]/form/table/tbody/tr[1]/td/div[1]/div/table/thead/tr[2]/th‌​[1]/a/img"])
for link in links:
 link.click()

我收到以下錯誤： is either invalid or does not result in a WebElement. The following error occurred:\\nInvalidSelectorError: Unable to locate an element with the xpath expression //*[@id=/html/body/div[2]/div/div/div[3]/div/div/table/tbody/tr[1]/td[2]/form/table/tbody/tr[1]/td/div[1]/div/table/thead/tr[2]/th[1]/a/img because of the following error:\\n[Exception... "The expression is not a legal expression." code: "12" nsresult: "0x805b0033 (SyntaxError)" location: "<unknown>"]' ; Stacktrace: is either invalid or does not result in a WebElement. The following error occurred:\\nInvalidSelectorError: Unable to locate an element with the xpath expression //*[@id=/html/body/div[2]/div/div/div[3]/div/div/table/tbody/tr[1]/td[2]/form/table/tbody/tr[1]/td/div[1]/div/table/thead/tr[2]/th[1]/a/img because of the following error:\\n[Exception... "The expression is not a legal expression." code: "12" nsresult: "0x805b0033 (SyntaxError)" location: "<unknown>"]' ; Stacktrace:

<a onclick="if(typeof functionx == 'function'){functionx(document.getElement…,'liststuff','');}return false" href="#">

   <img style="border: 0px;" onmouseover="this.src='/add-hover.gif';" onmouseout="this.src='/add.gif';" alt="Add" src="/icon-add.gif"></img>

</a>

Answer 1

與其擁有元素的絕對路徑，不如依賴其父元素和屬性：

link = driver.find_element_by_xpath('//a[@onclick and @href = "#" and img/@alt = "Add"]')