Python：Selenium“没有这样的元素”XPath 或 ID

Question

I am attempting to log into Tessco.com I have learned this site uses JavaScript, which is why I was unable to locate a form using RoboBrowser.

I am now using Selenium. I have used two methods to enter information into a field. One, using the driver.find_element_by_xpath() as well as driver.find_element_by_id()

Both attempts yield an error. The code is as follows:

import time
from selenium import webdriver
chrome_path = r"C:\Users\James\Documents\Python Scripts\jupyterNoteBooks\ScrapingData\chromedriver_win32\chromedriver.exe"
driver = webdriver.Chrome(chrome_path)
driver.get("https://www.tessco.com/login")

userName = "FirstName.SurName321123@gmail.com"
password = "PasswordForThis123"

elem = driver.find_element_by_xpath("""//*[@id="userID"]""")
elem = send_keys(userName)

elem = driver.find_element_by_xpath("""//*[@id="password"]""")
elem = send_keys(password)

driver.close()

The error is:

NoSuchElementException: Message: no such element: Unable to locate element: {"method":"xpath","selector":"//*[@id="userID"]"}

When I call the element by using ID as such:

elem = driver.find_element_by_id("userID")
elem = send_keys(userName)

elem = driver.find_element_by_id("password")
elem = send_keys(password)

I get:

NoSuchElementException: Message: no such element: Unable to locate element: {"method":"css selector","selector":"[id="userID"]"}

I was under the impression I inspected the element and used the appropriate names.

Any hints or ideas what I am not doing correctly?

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Solution provided below in the comments section. Code modified to:

import time
from selenium import webdriver
#Webdriver wait functions being introduced to add a delay.
#I was running into problems, with the ID not being found
#add wait for the element to be clickable before trying send keys
from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC

chrome_path = r"C:\Users\James\Documents\Python Scripts\jupyterNoteBooks\ScrapingData\chromedriver_win32\chromedriver.exe"
driver = webdriver.Chrome(chrome_path)
driver.get("https://www.tessco.com/login")

userName = "FirstName.SurName321123@gmail.com"
password = "PasswordForThis123"

wait = WebDriverWait(driver, 10)

elem = wait.until(EC.element_to_be_clickable((By.ID, "userID"))) 
elem.send_keys(userName)

elem = wait.until(EC.element_to_be_clickable((By.ID, "password"))) 
elem.send_keys(password)

driver.close()

Answer 1

It's likely that the element is not visible at first and that causes the failure. Wait until the element is visible/clickable and then use send keys.

WebDriverWait(driver, 10).until(EC.element_to_be_clickable((By.ID, "userID"))).send_keys(userName)

Answer 2

I guess the element search happens before its loaded. My suggestion would try putting some wait and it should work.