Selenium Firefox Webdriver NoSuchElement链接上的异常：

Question

由于某种原因，单击链接似乎在Selenium WebDriver中对我无效，而在Selenium IDE中它工作得很好。

我在Selenium IDE和Selenium Webdriver上构建的所有其他“复制粘贴”的东西似乎都起作用。

例外：

org.openqa.selenium.NoSuchElementException: Unable to locate element: {"method":"css selector","selector":"a.mx-name-159b6aef-dbc3-5b23-a735-cf99f8341771-1-3"} 
Command duration or timeout: 10.10 seconds 
For documentation on this error, please visit: http://seleniumhq.org/exceptions/no_such_element.html 
Build info: version: '2.50.1', revision: 'd7fc91b', time: '2016-01-29 19:04:49' 
System info: host: 'LT1736', ip: '10.54.3.175', os.name: 'Windows 8.1', os.arch: 'amd64', os.version: '6.3', java.version: '1.8.0_71' 
Driver info: org.openqa.selenium.firefox.FirefoxDriver 
Capabilities [{applicationCacheEnabled=true, rotatable=false, handlesAlerts=true, databaseEnabled=true, version=43.0.4, platform=WINDOWS, nativeEvents=false, acceptSslCerts=true, webStorageEnabled=true, locationContextEnabled=true, browserName=firefox, takesScreenshot=true, javascriptEnabled=true, cssSelectorsEnabled=true}] 
Session ID: 62532082-d8c1-4d22-8884-6e266449ca06 
*** Element info: {Using=css selector, value=a.mx-name-159b6aef-dbc3-5b23-a735-cf99f8341771-1-3} 

代码：

public class CRUD_Technologie { 
    public WebDriver driver;  

    @Test(priority=1) 
    public void openApp() { 
     driver.get("http://localhost:8080/index.html"); 
    } 

    @Test(priority=2) 
    public void login() { 
     driver.findElement(By.cssSelector("#usernameInput")).sendKeys("MxAdmin"); 
     driver.findElement(By.cssSelector("#passwordInput")).sendKeys("1"); 
     driver.findElement(By.cssSelector("#loginButton")).click(); 
    } 

    @Test(priority=3) 
    public void selectUserAndGoToPageTechnologieOverview() { 
     FluentWait<WebDriver> wait = new FluentWait<WebDriver>(driver).withTimeout(30, TimeUnit.SECONDS) 
       .pollingEvery(5, TimeUnit.SECONDS) 
       .ignoring(NoSuchElementException.class); 
     driver.findElement(By.cssSelector("div.mx-demouserswitcher-toggle")).click(); 
     driver.findElement(By.cssSelector("li[data-id='3']")).click(); 
     wait.until(ExpectedConditions.visibilityOfElementLocated(By.cssSelector("a.mx-name-159b6aef-dbc3-5b23-a735-cf99f8341771-1-3"))).click(); 
    } 

    @Parameters("browser") 
    @BeforeTest 
    public void beforeTest(String browser) { 
     if(browser.equalsIgnoreCase("firefox")){ 
      driver = new FirefoxDriver(); 
     } 
     else { 
      driver = new HtmlUnitDriver(); 
     } 
     driver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS); 

    } 

    @AfterTest 
    public void afterTest() { 
     driver.close(); 
    } 
} 

链接元素的相关HTML：

<div id="mxui_widget_Navbar_0" class="navbar navbar-default mx-navbar mx-name-menuBar1 hidden-xs" tabindex="-1" data-mendix-id="150" style="background-color: black ! important;" widgetid="mxui_widget_Navbar_0"> 
<ul class="nav navbar-nav"> 
<li class="mx-navbar-item"> 
<a class="mx-name-159b6aef-dbc3-5b23-a735-cf99f8341771-0" href="#" data-item-id="159b6aef-dbc3-5b23-a735-cf99f8341771-0"> 
<span class="glyphicon glyphicon-home"/> 
Home 
</a> 
</li> 
<li class="mx-navbar-item dropdown"> 
<a class="mx-name-159b6aef-dbc3-5b23-a735-cf99f8341771-1" href="#" data-item-id="159b6aef-dbc3-5b23-a735-cf99f8341771-1"> 
<span class="glyphicon glyphicon-th-list"/> 
Master Data Mendix 
<b class="caret"/> 
</a> 
<ul class="dropdown-menu mx-navbar-submenu"> 
<li class="mx-navbar-subitem"> 
<a class="mx-name-159b6aef-dbc3-5b23-a735-cf99f8341771-1-0" href="#" data-item-id="159b6aef-dbc3-5b23-a735-cf99f8341771-1-0"> 
<span class="glyphicon glyphicon-euro"/> 
Rollen 
</a> 
</li> 
<li class="mx-navbar-subitem"> 
<a class="mx-name-159b6aef-dbc3-5b23-a735-cf99f8341771-1-1" href="#" data-item-id="159b6aef-dbc3-5b23-a735-cf99f8341771-1-1"> 
<span class="glyphicon glyphicon-modal-window"/> 
Scherm type 
</a> 
</li> 
<li class="mx-navbar-subitem"> 
<a class="mx-name-159b6aef-dbc3-5b23-a735-cf99f8341771-1-2" href="#" data-item-id="159b6aef-dbc3-5b23-a735-cf99f8341771-1-2"> 
<span class="glyphicon glyphicon-book"/> 
Story type 
</a> 
</li> 
<li class="mx-navbar-subitem"> 
<a class="mx-name-159b6aef-dbc3-5b23-a735-cf99f8341771-1-3" href="#" data-item-id="159b6aef-dbc3-5b23-a735-cf99f8341771-1-3"> 
<span class="glyphicon glyphicon-briefcase"/> 
Technologie 
</a> 
</li> 
</ul> 
</li> 
<li class="mx-navbar-item dropdown"> 
<a class="mx-name-159b6aef-dbc3-5b23-a735-cf99f8341771-2" href="#" data-item-id="159b6aef-dbc3-5b23-a735-cf99f8341771-2"> 
<span class="glyphicon glyphicon-th-list"/> 
Master Data AFAS 
<b class="caret"/> 
</a> 
<ul class="dropdown-menu mx-navbar-submenu"> 
<li class="mx-navbar-subitem"> 
<a class="mx-name-159b6aef-dbc3-5b23-a735-cf99f8341771-2-0" href="#" data-item-id="159b6aef-dbc3-5b23-a735-cf99f8341771-2-0"> 
<span class="glyphicon glyphicon-glass"/> 
Klanten 
</a> 
</li> 
<li class="mx-navbar-subitem"> 
<a class="mx-name-159b6aef-dbc3-5b23-a735-cf99f8341771-2-1" href="#" data-item-id="159b6aef-dbc3-5b23-a735-cf99f8341771-2-1"> 
<span class="glyphicon glyphicon-list-alt"/> 
Werkmaatschappij 
</a> 
</li> 
</ul> 
</li> 
</ul> 
</div> 

Answer 1

（1）你有没有等待同一元素的第一正如你正在用其他元素做的那样

例子： -

您在瓦亭： -

wait.until(ExpectedConditions.visibilityOfElementLocated(By.cssSelector("li[data-id='3']"))).click(); 

你是不是等待，尝试为你的代码的其余部分没有做similer

driver.findElement(By.cssSelector("a.mx-name-159b6aef-dbc3-5b23-a735-cf99f8341771-1-3")).click(); 

（2）如果你是能够使用相同的CSS定位器使用IDE点击，然后尝试点击JavascriptExecutor。

JavascriptExecutor是硒的webdriver提供

if (driver.findElements(By.cssSelector("a.mx-name-159b6aef-dbc3-5b23-a735-cf99f8341771-1-3").size() != 0) { 
    WebElement element= driver.findElement(By.cssSelector("a.mx-name-159b6aef-dbc3-5b23-a735-cf99f8341771-1-3")) 
    JavascriptExecutor executor = (JavascriptExecutor) driver; 
    executor.executeScript("arguments[0].click();", element); 
} 
else{ 
      System.out.println("Element not present"); 
    } 

希望它会帮助你:)接口