尝试在动态加载的iframe中抓取数据表所在的网站。该URL永远不会改变，我已经使用硒来导航到表。但是一旦到达那里，它仍然找不到ID为“ theiframe”的iframe。我看到使用检查元素的iframe，但是当我使用脚本时却找不到它。
我尝试通过xpath public class ArrayPool<T>
{
public int Size { get => pool.Count(); }
public int maxSize = 3;
public int circulingObjectCount = 0;
private Queue<T> pool = new Queue<T>();
private Func<T> constructorFunc;
public ArrayPool(Func<T> constructorFunc) {
this.constructorFunc = constructorFunc;
}
public Task Use(Func<T, Task> action)
{
T item = GetNextItem(); //DeQueue the item
var t = action(item);
t.ContinueWith(task => pool.Enqueue(item)); //Requeue the item
return t;
}
private T GetNextItem()
{
//Create new object if pool is empty and not reached maxSize
if (pool.Count == 0 && circulingObjectCount < maxSize)
{
T item = constructorFunc();
circulingObjectCount++;
Console.WriteLine("Pool empty, adding new item");
return item;
}
//Wait for Queue to have at least 1 item
WaitForReturns();
return pool.Dequeue();
}
private void WaitForReturns()
{
long timeouts = 60000;
while (pool.Count == 0 && timeouts > 0) { timeouts--; System.Threading.Thread.Sleep(1); }
if(timeouts == 0)
{
throw new Exception("Wait timed-out");
}
}
}
和CSS选择器(("//iframe[@id='theiframe']")定位iframe进行抓取。仍然收到一条消息，提示它找不到元素
("theiframe")答案 0 :(得分：1)
页面上存在嵌套的iframe。您需要同时切换到iframes。
框架1 ：ID ='interiorFrame'
框架2 ：ID ='theiframe'
诱导WebDriverWait和frame_to_be_available_and_switch_to_it()两帧。
尝试下面的代码。
from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
from selenium.webdriver.common.action_chains import ActionChains
from selenium import webdriver
driver = webdriver.Firefox()
driver.get("http://www.1line.williams.com/Transco/index.html")
action = ActionChains(driver)
step1=WebDriverWait(driver,10).until(EC.element_to_be_clickable((By.XPATH,"//div[4]/ul[1]/li[5]/a[1]")))
action.move_to_element(step1).perform()
step2=WebDriverWait(driver,10).until(EC.element_to_be_clickable((By.XPATH,"//div[4]/ul[1]/li[5]/ul[1]/li[1]/a[1]")))
action.move_to_element(step2).click(step2).perform()
WebDriverWait(driver,20).until(EC.frame_to_be_available_and_switch_to_it((By.ID,'interiorFrame')))
WebDriverWait(driver,10).until(EC.frame_to_be_available_and_switch_to_it((By.ID,'theiframe')))
page_source=driver.page_source
print(page_source)