Question

我正在使用selenium，IEDriver和C＃，我想等待页面加载。我有这段代码：

/// <summary>
/// Ceka dokud neni stranka nastena
/// </summary>
public static void WaitForPageToLoad()
{
  try
  {
    Thread.Sleep(500);
    Log.Trace("Browser.WaitForPageToLoad() - Ceka dokud neni stranka nactena ...");
    new WebDriverWait(Browser.Driver, new TimeSpan(0, 0, 360)).Until(d => ((IJavaScriptExecutor)d).ExecuteScript("return document.readyState").Equals("complete"));
    Thread.Sleep(1000);
  }
  catch (Exception ex)
  {
    Log.Error(ex);
    throw;
  }
}

但它会崩溃：

    2018-01-04 15:39:27.2266 - ERROR: System.InvalidOperationException: JavaScript error (UnexpectedJavaScriptError)
   at OpenQA.Selenium.Remote.RemoteWebDriver.UnpackAndThrowOnError(Response errorResponse)
   at OpenQA.Selenium.Remote.RemoteWebDriver.Execute(String driverCommandToExecute, Dictionary`2 parameters)
   at OpenQA.Selenium.Remote.RemoteWebDriver.ExecuteScriptCommand(String script, String commandName, Object[] args)
   at OpenQA.Selenium.Remote.RemoteWebDriver.ExecuteScript(String script, Object[] args)
   at BaseFramework.Browser.<>c.<WaitForPageToLoad>b__10_0(IWebDriver d) in C:\TFS\PRIVPMT\Selenium\BaseFramework\Browser.cs:line 97
   at OpenQA.Selenium.Support.UI.DefaultWait`1.Until[TResult](Func`2 condition)
   at BaseFramework.Browser.WaitForPageToLoad() in C:\TFS\PRIVPMT\Selenium\BaseFramework\Browser.cs:line 97
EXCEPTION: System.InvalidOperationException: JavaScript error (UnexpectedJavaScriptError)
   at OpenQA.Selenium.Remote.RemoteWebDriver.UnpackAndThrowOnError(Response errorResponse)
   at OpenQA.Selenium.Remote.RemoteWebDriver.Execute(String driverCommandToExecute, Dictionary`2 parameters)
   at OpenQA.Selenium.Remote.RemoteWebDriver.ExecuteScriptCommand(String script, String commandName, Object[] args)
   at OpenQA.Selenium.Remote.RemoteWebDriver.ExecuteScript(String script, Object[] args)
   at BaseFramework.Browser.<>c.<WaitForPageToLoad>b__10_0(IWebDriver d) in C:\TFS\PRIVPMT\Selenium\BaseFramework\Browser.cs:line 97
   at OpenQA.Selenium.Support.UI.DefaultWait`1.Until[TResult](Func`2 condition)
   at BaseFramework.Browser.WaitForPageToLoad() in C:\TFS\PRIVPMT\Selenium\BaseFramework\Browser.cs:line 103
   at Gamma.Tests.GammaICRM.AT82688_ICRM_SMOKE() in C:\TFS\PRIVPMT\Selenium\Gamma.UI.Tests\Gamma.Tests\GammaICRM.cs:line 72
   at Gamma.Tests.GammaICRM.AT82688_ICRM_SMOKE_PerformTest() in C:\TFS\PRIVPMT\Selenium\Gamma.UI.Tests\Gamma.Tests\GammaICRM.cs:line 23

大部分时间都有效，但有时它会在此

上崩溃

下一个方法是：

public static void LeftClick(this IWebElement element)
    {
      //pockame dokud nelze na element kliknout
      new WebDriverWait(Browser.Driver, new TimeSpan(0, 0, 120)).Until(ExpectedConditions.ElementToBeClickable(element));

      Actions actions = new Actions(Browser.Driver);
      //posuneme cursor na element
      actions.MoveToElement(element).Perform();
      //klikeneme na element
      actions.Click().Build().Perform();
    }

传递webElement是由XPath创建的（webElement总是正确的）

Answer 1

您可以尝试调用WebDriverWait类。您可以使用它来等待元素显示在页面上（即如果此对象存在则页面加载）

public static IWebElement WaitUntilElementExists(By elementLocator, int timeout = 10)
{
    try
    {
        var wait = new WebDriverWait(Driver, TimeSpan.FromSeconds(timeout));
        return wait.Until(ExpectedConditions.ElementExists(elementLocator));
    }
    catch (NoSuchElementException)
    {
        Console.WriteLine("Element with locator: '" + elementLocator + "' was not found in current context page.");
        throw;
    }
}

在此代码中，该方法返回wait.until，然后对应该在页面上的元素上的elementexists条件。只是让它尝试在页面加载时在页面上找到一个应该存在的元素。如果它在一段时间内不存在，它将给出NoSuchElementException（因此超时）。抓住这个并给出你自己的输出

来源：How to get webDriver to wait for page to load (C# Selenium project)

希望这对所有人有帮助

Answer 2

我遇到了同样的问题，问题是我在框架内。在执行此javascript之前切换回默认内容可以解决该错误。

希望问题仍然对您有帮助。

总之，在致电login(email: string, password: string): Observable<Response> { return this.httpClient.post(url, {email: email, password: password}).pipe( tap(async (response: Response) => { // login successful if there's a jwt token in the response if (response) { this.token = response.token; } return response; }) ); }之前，我已经使用过WaitForPageToLoad()

Selenium C＃等待页面加载--UnexpectedJavaScriptError

2 个答案: