java - 用 Selenium 找到按钮ID

我想使用Selenium Web驱动程序定位按钮ID。我尝试了这段代码：

@Test
    public void hello()
    {
        RemoteWebDriver driver = BrowserFactory.getDriver("chrome", "C:\\Program Files (x86)\\Google\\Chrome\\Application\\chromedriver.exe");

        driver.get("http://jenkins.mws.com:8080");

        WebDriverWait waitPage = new WebDriverWait(driver, 20);
        WebElement until = waitPage.until(ExpectedConditions.presenceOfElementLocated(By.id("ready")));

        if (until.isDisplayed()){
            System.out.println("button is displayed");
        }
    }

但我得到Timed out after 20 seconds waiting for presence of element located by: By.tagName: button

这是我要测试的代码：

http://pastebin.com/up29pSRQ

我可以找到标签按钮吗？

最佳答案

<button>在iFrame内部。首先切换到iFrame，然后尝试。