NoSuchElementException，Selenium无法找到元素 [英] NoSuchElementException, Selenium unable to locate element

问题描述

我想在硒中找到我的TextField，但我不知道如何(我第一次使用Sellenium).

我尝试过:

 driver.findElement(By.id("originTextField"))

或通过xPath和cssSelector由chrome在开发工具中生成的字符串.

请帮助我，我会感谢您的解释.

这是html:

解决方案

NoSuchElementException

org.openqa. selenium.NoSuchElementException (通常称为 NoSuchElementException )扩展了

使用WebElement.findElement(By by)时:

//example : WebElement my_element = element.findElement(By.xpath("//my_xpath"));

按照JavaDocs的规定，与其他 WebDriverException 一样， NoSuchElementException 应该包含以下常量字段:

Constant Field      Type                                        Value
SESSION_ID          public static final java.lang.String        "Session ID"
e.g. (Session info: chrome=63.0.3239.108)

DRIVER_INFO         public static final java.lang.String        "Driver info"
e.g. (Driver info: chromedriver=2.34.522940 (1a76f96f66e3ca7b8e57d503b4dd3bccfba87af1),platform=Windows NT 6.1.7601 SP1 x86)

BASE_SUPPORT_URL    protected static final java.lang.String     "http://seleniumhq.org/exceptions/"
e.g. (For documentation on this error, please visit: http://seleniumhq.org/exceptions/no_such_element.html)

---

原因

出现 Element异常的原因可以是以下任一原因:

• 您采用的定位器策略在视口.
• 您采用的定位器策略可以识别元素，但是由于存在属性 style ="display:none;" 而不会显示.
• 您采用的定位器策略不能唯一标识 HTML DOM 中所需的元素，并且当前可以找到其他隐藏/不可见元素.
• 您要查找的 WebElement 位于<iframe>标记内.
• 甚至在元素在 HTML DOM 中存在/可见之前， WebDriver 实例仍在寻找 WebElement .

---

解决方案

解决 NoSuchElementException 的解决方案可以是以下任意一种:

• 采用唯一的定位器策略标识所需的 WebElement .您可以使用开发人员工具( Ctrl + Shift + I 或 F12 )，然后使用 Element Inspector .

  在这里，您可以在

  在这里您可以找到有关，请通过executeScript()方法删除该属性，如下所示:

  WebElement element = driver.findElement(By.xpath("element_xpath"));
  ((JavascriptExecutor)driver).executeScript("arguments[0].removeAttribute('style')", element)
  element.sendKeys("text_to_send");
  

• 要检查元素是否在<iframe>中，请遍历 HTML 以找到相应的<iframe>标签和switchTo()所需的 iframe 通过以下两种方法之一:

  driver.switchTo().frame("frame_name");
  driver.switchTo().frame("frame_id");
  driver.switchTo().frame(1); // 1 represents frame index
  

  您可以在.. p>

• 如果该元素在 HTML DOM 中不存在 /可见，请诱导

• 要等待

• 要等待

---

参考

您可以找到 Selenium 的<在基于客户端的相关讨论中，使用href ="/questions/tagged/python" class ="post-tag" title =显示标记为'python'" rel ="tag"> python 基于客户端的问题

• Selenium"selenium.common.exceptions.NoSuchElementException "(使用Chrome浏览器时

i would like to find my TextField in selenium, but i dont know how (i use sellenium for the first time).

I tried:

 driver.findElement(By.id("originTextField"))

or by xPath and cssSelector String generated by chrome in dev tools.

Please help me, i would appreciate explanation.

this is html:

解决方案

NoSuchElementException

org.openqa.selenium.NoSuchElementException popularly known as NoSuchElementException extends org.openqa.selenium.NotFoundException which is a type of WebDriverException.

NoSuchElementException can be thrown in 2 cases as follows :

• When using WebDriver.findElement(By by) :

  //example : WebElement my_element = driver.findElement(By.xpath("//my_xpath"));
  

• When using WebElement.findElement(By by) :

  //example : WebElement my_element = element.findElement(By.xpath("//my_xpath"));
  

As per the JavaDocs just like any other WebDriverException, NoSuchElementException should contain the following Constant Fields :

Constant Field      Type                                        Value
SESSION_ID          public static final java.lang.String        "Session ID"
e.g. (Session info: chrome=63.0.3239.108)

DRIVER_INFO         public static final java.lang.String        "Driver info"
e.g. (Driver info: chromedriver=2.34.522940 (1a76f96f66e3ca7b8e57d503b4dd3bccfba87af1),platform=Windows NT 6.1.7601 SP1 x86)

BASE_SUPPORT_URL    protected static final java.lang.String     "http://seleniumhq.org/exceptions/"
e.g. (For documentation on this error, please visit: http://seleniumhq.org/exceptions/no_such_element.html)

---

Reason

The reason for NoSuchElementException can be either of the following :

• The Locator Strategy you have adopted doesn't identifies any element in the HTML DOM.
• The Locator Strategy you have adopted is unable to identify the element as it is not within the browser's Viewport.
• The Locator Strategy you have adopted identifies the element but is invisible due to presence of the attribute style="display: none;".
• The Locator Strategy you have adopted doesn't uniquely identifies the desired element in the HTML DOM and currently finds some other hidden / invisible element.
• The WebElement you are trying to locate is within an <iframe> tag.
• The WebDriver instance is looking out for the WebElement even before the element is present/visibile within the HTML DOM.

---

Solution

The solution to address NoSuchElementException can be either of the following :

• Adopt a Locator Strategy which uniquely identifies the desired WebElement. You can take help of the Developer Tools (Ctrl+Shift+I or F12) and use Element Inspector.

  Here you will find a detailed discussion on how to inspect element in selenium3.6 as firebug is not an option any more for FF 56?

• Use executeScript() method to scroll the element in to view as follows :

  WebElement elem = driver.findElement(By.xpath("element_xpath"));
  ((JavascriptExecutor)driver).executeScript("arguments[0].scrollIntoView();", elem);
  

  Here you will find a detailed discussion on Scrolling to top of the page in Python using Selenium

• Incase element is having the attribute style="display: none;", remove the attribute through executeScript() method as follows :

  WebElement element = driver.findElement(By.xpath("element_xpath"));
  ((JavascriptExecutor)driver).executeScript("arguments[0].removeAttribute('style')", element)
  element.sendKeys("text_to_send");
  

• To check if the element is within an <iframe> traverse up the HTML to locate the respective <iframe> tag and switchTo() the desired iframe through either of the following methods :

  driver.switchTo().frame("frame_name");
  driver.switchTo().frame("frame_id");
  driver.switchTo().frame(1); // 1 represents frame index
  

  Here you can find a detailed discussion on Is it possible to switch to an element in a frame without using driver.switchTo().frame("frameName") in Selenium Webdriver Java?.

• If the element is not present/visible in the HTML DOM immediately, induce WebDriverWait with ExpectedConditions set to proper method as follows :

  • To wait for presenceOfElementLocated :

    new WebDriverWait(driver, 20).until(ExpectedConditions.presenceOfElementLocated(By.xpath("//div[@class='buttonStyle']//input[@id='originTextField']")));
    

  • To wait for visibilityOfElementLocated :

    new WebDriverWait(driver, 20).until(ExpectedConditions.visibilityOfElementLocated(By.xpath("//div[@class='buttonStyle']//input[@id='originTextField']")));
    

  • To wait for elementToBeClickable :

    new WebDriverWait(driver, 20).until(ExpectedConditions.elementToBeClickable(By.xpath("//div[@class='buttonStyle']//input[@id='originTextField']")));
    

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Reference

You can find Selenium's python client based relevant discussion in:

• Selenium "selenium.common.exceptions.NoSuchElementException" when using Chrome

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