SwitchTo IFrame，其中XPath包含id的一部分

Question

因此，当我点击按钮时，我会弹出一个iframe，我正在尝试切换到此iframe。我面临的挑战是iframe的ID是动态的，具体取决于会话，所以我需要根据id的前缀切换到iframe，无论如何都是相同的。

    public void StartMTATransaction(string date)
    {
        Transaction.Clear();
        Transaction.SendKeys("MTA");
        Go.Click();
        ObjectRepository.Driver.SwitchTo().Frame(ObjectRepository.driver.FindElement(By.XPath("//iframe[starts-with(@id,'dctPopup_dctPopupWindow') and contains(@name,'dctPopup_dctPopupWindow')]")));
        TransactionDate.SendKeys(date);
        ObjectRepository.driver.SwitchTo().DefaultContent();
    }

当我尝试运行代码时，在第2行获得以下错误：

System.NullReferenceException：'对象引用未设置为对象的实例。'

元素我试图切换到：

<iframe id="dctPopup_dctPopupWindow5D21CAC8BEAC0794DFC40B9D0081D49E" style="WIDTH: 100%; HEIGHT: 100%; BACKGROUND-COLOR: transparent" name="dctPopup_dctPopupWindow5D21CAC8BEAC0794DFC40B9D0081D49E" frameborder="0" width="100%" height="100%"></iframe>

Answer 1

根据HTML切换到IFrame，您可以使用以下代码块：

Go.Click();   
ObjectRepository.Driver.SwitchTo().Frame(ObjectRepository.driver.FindElement(By.XPath("//iframe[starts-with(@id,'dctPopup_dctPopupWindow')]")));
TransactionDate.SendKeys(date);

通过耦合name属性，您可以更精细：

Go.Click();   
ObjectRepository.Driver.SwitchTo().Frame(ObjectRepository.driver.FindElement(By.XPath("//iframe[starts-with(@id,'dctPopup_dctPopupWindow') and contains(@name,'dctPopup_dctPopupWindow')]")));
TransactionDate.SendKeys(date);

但是根据最佳实践，我们应该为WebDriverWait引导IFrame可用于切换如下：

Go.Click();
_wait = new WebDriverWait(_driver, TimeSpan.FromSeconds(6));
_wait.Until(ExpectedConditions.FrameToBeAvailableAndSwitchToIt(By.XPath("//iframe[starts-with(@id,'dctPopup_dctPopupWindow') and contains(@name,'dctPopup_dctPopupWindow')]")));
TransactionDate.SendKeys(date);

Answer 2

尝试以下方法，您的xpath需要更正。

Go.Click();   
ObjectRepository.Driver.SwitchTo().Frame(ObjectRepository.driver.FindElement(By.XPath("//iframe[contains(@id, 'dctPopup_')]")));
TransactionDate.SendKeys(date);

正确的xpath是//iframe[contains(@id, 'dctPopup_')]

Answer 3

也可以使用css选择器：

iframe[id*='dctPopup']

如果你想坚持使用xpath，请尝试：

//iframe[contains(@id, 'dctPopup')]