webdriver没有第二次按类名定位元素

Question

这是单击按钮的代码：

var nextBTN = testhelper.FireFoxBrowser.FindElement(By.ClassName("trigger-next-button"));
nextBTN.Click();

Answer 1

根据添加睡眠的工作原理，这听起来好像您的代码比WebDriver更快了。您需要执行某种同步，以使它们彼此保持同步。我会在这里使用一个陈旧性检查，如下所示：

WebDriverWait wait = new WebDriverWait(driver, 60); // 60 is the time to wait, can be extended as needed. This is an 'up-to' wait and will not necessarily stop for 60 seconds.
    var nextBTN = testhelper.FireFoxBrowser.FindElement(By.ClassName("trigger-next-button"));
nextBTN.Click();
//Wait for that button to 'go away' before proceeding.
wait.until(ExpectedConditions.stalenessOf(nextBTN));
//Wait for another instance of the button to appear and be clickable before proceeding.
wait.until(ExpectedConditions.elementToBeClickable(By.ClassName("trigger-next-button")));
nextBTN = testhelper.FireFoxBrowser.FindElement(By.ClassName("trigger-next-button"));
nextBTN.Click();
wait.until(ExpectedConditions.stalenessOf(nextBTN));

有关等待和预期条件的更多信息，请参见以下内容：

• https://selenium.googlecode.com/git/docs/api/java/org/openqa/selenium/support/ui/expectedconditions.html
• http://www.seleniumhq.org/docs/04_webdriver_advanced.jsp