Question

package wait1;

import org.openqa.selenium.By;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.openqa.selenium.support.ui.ExpectedConditions;
import org.openqa.selenium.support.ui.WebDriverWait;

public class Explicit {

    public static void main(String[] args) {
        FirefoxDriver driver= new FirefoxDriver();

        WebDriverWait wait= new WebDriverWait(driver,20 );

        driver.get("http://www.91mobiles.com/");
        driver.findElement(By.xpath("//*[@id='q']")).sendKeys("Micromax");

        //wait.until(ExpectedConditions.visibilityOfElementLocated(By.xpath("//*[@id='ui-id-22']/span[2]")));

        wait.until(ExpectedConditions.visibilityOfElementLocated(By.id("id=ui-id-172")));
        driver.findElement(By.xpath("//*[@id='ui-id-52']")).click();

    }

}

执行上述脚本时出现以下错误：

    Exception in thread "main" org.openqa.selenium.TimeoutException: Timed out after 20 seconds waiting for visibility of element located by By.id: id=ui-id-172
Build info: version: '2.33.0', revision: '4e90c97', time: '2013-05-22 15:33:32'
System info: os.name: 'Windows 7', os.arch: 'amd64', os.version: '6.1', java.version: '1.7.0_25'
Driver info: driver.version: unknown
    at org.openqa.selenium.support.ui.FluentWait.timeoutException(FluentWait.java:259)
    at org.openqa.selenium.support.ui.FluentWait.until(FluentWait.java:228)
    at wait1.Explicit.main(Explicit.java:20)
Caused by: org.openqa.selenium.NoSuchElementException: Unable to locate element: {"method":"id","selector":"id=ui-id-172"}
Command duration or timeout: 21 milliseconds
For documentation on this error, please visit: http://seleniumhq.org/exceptions/no_such_element.html
Build info: version: '2.33.0', revision: '4e90c97', time: '2013-05-22 15:33:32'
System info: os.name: 'Windows 7', os.arch: 'amd64', os.version: '6.1', java.version: '1.7.0_25'
Session ID: fd977506-2457-4981-a304-f9a9b6b57f4e
Driver info: org.openqa.selenium.firefox.FirefoxDriver
Capabilities [{platform=XP, databaseEnabled=true, cssSelectorsEnabled=true, javascriptEnabled=true, acceptSslCerts=true, handlesAlerts=true, browserName=firefox, browserConnectionEnabled=true, nativeEvents=true, webStorageEnabled=true, rotatable=false, locationContextEnabled=true, applicationCacheEnabled=true, takesScreenshot=true, version=17.0.7}]
    at sun.reflect.GeneratedConstructorAccessor10.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
    at java.lang.reflect.Constructor.newInstance(Unknown Source)
    at org.openqa.selenium.remote.ErrorHandler.createThrowable(ErrorHandler.java:191)
    at org.openqa.selenium.remote.ErrorHandler.throwIfResponseFailed(ErrorHandler.java:145)
    at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:554)
    at org.openqa.selenium.remote.RemoteWebDriver.findElement(RemoteWebDriver.java:307)
    at org.openqa.selenium.remote.RemoteWebDriver.findElementById(RemoteWebDriver.java:348)
    at org.openqa.selenium.By$ById.findElement(By.java:216)
    at org.openqa.selenium.remote.RemoteWebDriver.findElement(RemoteWebDriver.java:299)
    at org.openqa.selenium.support.ui.ExpectedConditions.findElement(ExpectedConditions.java:522)
    at org.openqa.selenium.support.ui.ExpectedConditions.access$0(ExpectedConditions.java:520)
    at org.openqa.selenium.support.ui.ExpectedConditions$4.apply(ExpectedConditions.java:130)
    at org.openqa.selenium.support.ui.ExpectedConditions$4.apply(ExpectedConditions.java:1)
    at org.openqa.selenium.support.ui.FluentWait.until(FluentWait.java:208)
    ... 1 more
Caused by: org.openqa.selenium.remote.ErrorHandler$UnknownServerException: Unable to locate element: {"method":"id","selector":"id=ui-id-172"}
Build info: version: '2.33.0', revision: '4e90c97', time: '2013-05-22 15:33:32'
System info: os.name: 'Windows 7', os.arch: 'amd64', os.version: '6.1', java.version: '1.7.0_25'
Driver info: driver.version: unknown

Answer 1

您获得的行为是预期的行为。您指定了20秒的显式等待，在此期间无法建立ExpectedConditions.visibilityOfElementLocated(...)。所以等待失败并超时。

如果你想继续你的程序，你需要在try-catch块中包围等待并捕获org.openqa.selenium.TimeoutException

Answer 2

尝试使用像这样的

wait.until(ExpectedConditions.visibilityOfElementLocated(By.xpath("//*[@id='ui-id-52']"));

确保您在等待时使用的任何识别类型都应在您用于执行操作的声明中。（例如，点击，设置等。）

Answer 3

在这里，我们有两个解决方案......

尝试增加您的WebDriverWait时间以检查是否可以解决问题。
尝试通过firebug找到相同的元素，如果firebug成功找到它，那么WebDriverWait时间是唯一的罪魁祸首。

Answer 4

您将始终使用您拥有的代码获得超时。这是违规行：

wait.until(ExpectedConditions.visibilityOfElementLocated(By.id("id=ui-id-172")));

请注意{h} By.id("id=ui-id-172")。这是错的。它会查找标识为id=ui-id-172的对象。虽然可能拥有一个具有此值的id（是的，我尝试过并且它有效）但这不太可能是您想要的，特别是考虑到下一行的XPath表达式。您希望与代码的其余部分保持一致的是By.id("ui-id-172")。

与显式等待相关的查询：wait.until（ExpectedConditions.visibilityOfElementLocated（By.id（

4 个答案: