Python-Selenium无法通过ID定位已存在的元素

Let's break down exactly why your Selenium code is failing and how to fix it:

The Core Problem: Wrong Wait Condition #

Your main issue is using EC.element_to_be_clickable() on a readonly input. This expected condition has three strict requirements:

• Element exists in the DOM
• Element is visible
• Element is enabled (not marked as readonly/disabled)

Since your input has the readonly attribute, it will never be "clickable"—so the wait will always time out, causing the TimeoutException. For readonly elements, you need to use a more appropriate wait condition.

Step-by-Step Solutions #

1. Wait for the Element to Exist in the DOM #

If you just need to locate the element (regardless of visibility or its populated value), use EC.presence_of_element_located():

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

wait = WebDriverWait(driver, 10)
element = wait.until(EC.presence_of_element_located((By.ID, 'submissionKey')))

2. Wait for the Element to Be Visible #

If you need to ensure the element is actually visible on the page (not just present in the DOM), use EC.visibility_of_element_located():

element = wait.until(EC.visibility_of_element_located((By.ID, 'submissionKey')))

3. Wait for the JS-Set Value to Be Populated #

Since your page uses JavaScript to set the input's value from the auth URL parameter, you might want to wait until the value is actually loaded. Use a custom lambda or the built-in text condition:

# Wait for any non-empty value
element = wait.until(
    lambda driver: driver.find_element(By.ID, 'submissionKey').get_attribute('value') != ''
)

# Or use the built-in condition if you expect a specific value format
element = wait.until(
    EC.text_to_be_present_in_element_value((By.ID, 'submissionKey'), '')
)

Why Your Original find_element_by_id() Failed #

The initial NoSuchElementException likely happened because you tried to locate the element before the page's DOM had fully finished rendering. Adding a wait was the right instinct—you just picked the wrong wait condition for a readonly element.

Quick Sanity Checks #

• Double-check your driver is focused on the correct tab/window (no accidental navigation away)
• Confirm there are no hidden overlays temporarily blocking the element (your HTML doesn't show this, but it's worth ruling out)

内容的提问来源于stack exchange，提问作者Alex