我想确保在webdriver开始做事情之前,一个元素是存在的。
我正在尝试这样做:
WebDriverWait wait = new WebDriverWait(driver, new TimeSpan(0, 0, 5));
wait.Until(By.Id("login"));
我主要是挣扎如何设置匿名功能…
我想确保在webdriver开始做事情之前,一个元素是存在的。
我正在尝试这样做:
WebDriverWait wait = new WebDriverWait(driver, new TimeSpan(0, 0, 5));
wait.Until(By.Id("login"));
我主要是挣扎如何设置匿名功能…
当前回答
你可以使用下面的方法
WebDriverWait wait = new WebDriverWait(driver, new TimeSpan(0,0,5));
wait.Until(ExpectedConditions.ElementToBeClickable((By.Id("login")));
其他回答
第一个答案是好的,但我的问题是,未处理的异常没有关闭web驱动程序正确,它保持相同的第一个值,我使用的是1秒。
如果遇到同样的问题,重新启动Visual Studio并确保所有异常都得到了正确处理。
使用Rn222的答案和akns1的答案来使用ISearchContext,返回单个元素或列表。并且可以指定元素的最小数量:
public static class SearchContextExtensions
{
/// <summary>
/// Method that finds an element based on the search parameters within a specified timeout.
/// </summary>
/// <param name="context">The context where this is searched. Required for extension methods</param>
/// <param name="by">The search parameters that are used to identify the element</param>
/// <param name="timeOutInSeconds">The time that the tool should wait before throwing an exception</param>
/// <returns> The first element found that matches the condition specified</returns>
public static IWebElement FindElement(this ISearchContext context, By by, uint timeOutInSeconds)
{
if (timeOutInSeconds > 0)
{
var wait = new DefaultWait<ISearchContext>(context);
wait.Timeout = TimeSpan.FromSeconds(timeOutInSeconds);
return wait.Until<IWebElement>(ctx => ctx.FindElement(by));
}
return context.FindElement(by);
}
/// <summary>
/// Method that finds a list of elements based on the search parameters within a specified timeout.
/// </summary>
/// <param name="context">The context where this is searched. Required for extension methods</param>
/// <param name="by">The search parameters that are used to identify the element</param>
/// <param name="timeoutInSeconds">The time that the tool should wait before throwing an exception</param>
/// <returns>A list of all the web elements that match the condition specified</returns>
public static IReadOnlyCollection<IWebElement> FindElements(this ISearchContext context, By by, uint timeoutInSeconds)
{
if (timeoutInSeconds > 0)
{
var wait = new DefaultWait<ISearchContext>(context);
wait.Timeout = TimeSpan.FromSeconds(timeoutInSeconds);
return wait.Until<IReadOnlyCollection<IWebElement>>(ctx => ctx.FindElements(by));
}
return context.FindElements(by);
}
/// <summary>
/// Method that finds a list of elements with the minimum amount specified based on the search parameters within a specified timeout.<br/>
/// </summary>
/// <param name="context">The context where this is searched. Required for extension methods</param>
/// <param name="by">The search parameters that are used to identify the element</param>
/// <param name="timeoutInSeconds">The time that the tool should wait before throwing an exception</param>
/// <param name="minNumberOfElements">
/// The minimum number of elements that should meet the criteria before returning the list <para/>
/// If this number is not met, an exception will be thrown and no elements will be returned
/// even if some did meet the criteria
/// </param>
/// <returns>A list of all the web elements that match the condition specified</returns>
public static IReadOnlyCollection<IWebElement> FindElements(this ISearchContext context, By by, uint timeoutInSeconds, int minNumberOfElements)
{
var wait = new DefaultWait<ISearchContext>(context);
if (timeoutInSeconds > 0)
{
wait.Timeout = TimeSpan.FromSeconds(timeoutInSeconds);
}
// Wait until the current context found the minimum number of elements. If not found after timeout, an exception is thrown
wait.Until<bool>(ctx => ctx.FindElements(by).Count >= minNumberOfElements);
// If the elements were successfuly found, just return the list
return context.FindElements(by);
}
}
使用示例:
var driver = new FirefoxDriver();
driver.Navigate().GoToUrl("http://localhost");
var main = driver.FindElement(By.Id("main"));
// It can be now used to wait when using elements to search
var btn = main.FindElement(By.Id("button"), 10);
btn.Click();
// This will wait up to 10 seconds until a button is found
var button = driver.FindElement(By.TagName("button"), 10)
// This will wait up to 10 seconds until a button is found, and return all the buttons found
var buttonList = driver.FindElements(By.TagName("button"), 10)
// This will wait for 10 seconds until we find at least 5 buttons
var buttonsMin = driver.FindElements(By.TagName("button"), 10, 5);
driver.Close();
WebDriverWait将不生效。
var driver = new FirefoxDriver(
new FirefoxOptions().PageLoadStrategy = PageLoadStrategy.Eager
);
driver.Navigate().GoToUrl("xxx");
new WebDriverWait(driver, TimeSpan.FromSeconds(60))
.Until(d => d.FindElement(By.Id("xxx"))); // A tag that close to the end
一旦页面是“交互式的”,这将立即抛出异常。我不知道为什么,但是超时就好像它不存在一样。
也许SeleniumExtras。WaitHelpers很管用,但我没试过。这是官方的,但它被拆分为另一个NuGet包。你可以参考c# Selenium 'ExpectedConditions is obsolete'。
我使用FindElements并检查Count == 0。如果为真,则使用await Task.Delay。这真的不是很有效。
我看到许多解决方案已经张贴,工作很棒!但是,为了防止有人需要其他东西,我想我将发布两个我个人在Selenium c#中使用的解决方案来测试是否存在元素!
public static class IsPresent
{
public static bool isPresent(this IWebDriver driver, By bylocator)
{
bool variable = false;
try
{
IWebElement element = driver.FindElement(bylocator);
variable = element != null;
}
catch (NoSuchElementException){
}
return variable;
}
}
这是第二个:
public static class IsPresent2
{
public static bool isPresent2(this IWebDriver driver, By bylocator)
{
bool variable = true;
try
{
IWebElement element = driver.FindElement(bylocator);
}
catch (NoSuchElementException)
{
variable = false;
}
return variable;
}
}
我们可以这样实现:
public static IWebElement WaitForObject(IWebDriver DriverObj, By by, int TimeOut = 30)
{
try
{
WebDriverWait Wait1 = new WebDriverWait(DriverObj, TimeSpan.FromSeconds(TimeOut));
var WaitS = Wait1.Until(SeleniumExtras.WaitHelpers.ExpectedConditions.PresenceOfAllElementsLocatedBy(by));
return WaitS[0];
}
catch (NoSuchElementException)
{
Reports.TestStep("Wait for Element(s) with xPath was failed in current context page.");
throw;
}
}