Selenium Web 驱动程序 2.44.0 中的等待元素存在功能存在问题

Question

我面临元素等待/呈现/可点击的随机行为问题。我已经使用下面的逻辑来等待该元素，但它有时会起作用，而其他时候则不起作用。有人可以帮助我如何用元素等待的通用/标准方式解决这个问题。

问题/要求：加载网页时，我必须等待一个元素出现/可点击。我正在使用 Selenium Web 驱动程序 2.44.0 和 Firefox 33.0.3

使用的逻辑：

package com.ericsson.testing.automation.framework.ui.common;

import java.util.NoSuchElementException;
import java.util.concurrent.TimeUnit;

import org.openqa.selenium.By;
import org.openqa.selenium.ElementNotVisibleException;
import org.openqa.selenium.StaleElementReferenceException;
import org.openqa.selenium.UnhandledAlertException;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.support.ui.ExpectedConditions;
import org.openqa.selenium.support.ui.FluentWait;
import org.openqa.selenium.support.ui.WebDriverWait;

import com.google.common.base.Function;

public class Test {
    public static WebDriver driver;
    public static long timeOut = 180000;
    /** The poll time. */
    public int pollTime = 100;

    public void isElementClickable(WebDriver driver, WebElement webelement,
            long timeOutForEachElement) {
        try {
            WebDriverWait wait = new WebDriverWait(driver,
                    timeOutForEachElement);
            wait.until(ExpectedConditions.elementToBeClickable(webelement));
        } catch (UnhandledAlertException ex) {
            // Some debug logging info
        }
    }

    // Senario 2
    public void waitTillElementPresent(WebElement webelement) {
        System.out.println("Before Fluent Wait");
        System.out.println("Xpath = " + webelement);
        FluentWait<WebElement> fluentWait = new FluentWait<WebElement>(
                webelement);
        fluentWait.pollingEvery(pollTime, TimeUnit.MILLISECONDS);
        fluentWait.withTimeout(timeOut, TimeUnit.MILLISECONDS);
        System.out.println("After Fluent Wait");
        fluentWait.until(new Function<WebElement, Boolean>() {

            public Boolean apply(WebElement webelement) {
                try {
                    System.out.println("inside isDisplayed check");
                    return webelement.isDisplayed();
                } catch (NoSuchElementException ex) {
                    System.out.println("Inside NoSuchElementException");
                    return false;
                } catch (ElementNotVisibleException ex) {
                    System.out.println("Inside ElementNotVisibleException");
                    return false;
                } catch (StaleElementReferenceException ex) {
                    System.out.println("Inside StaleElementRefException");
                    return false;
                } catch (UnhandledAlertException ex) {
                    System.out.println("Inside UnhandledAlertException");
                    // Some logic for debug logging
                    return false;
                }
            }
        });
    }

    // Senario 3
    public void clickOnElement(String element) {
        while (true) {
            driver.findElement(By.xpath(element)).click();
            System.out.println("Trying to click on element" + element);
            break;
        }
        System.out.println("Clicked on element" + element);
    }

    /*
     * private boolean isElementPresent(String element) {
     *                  int myLink
     *  =driver.findElements(By.xpath(element)).size();
     *                  if (myLink != 0)                      return true;
     *                  else                      return false;              }
     */

    // Senario 4
    public void waitTillElementisClicked(String element) {
        boolean flag = true;
        while (flag == true) {
            // driver.findElement(By.xpath(element)).click();
            // flag=driver.findElement(By.xpath(element)).isSelected();
            driver.findElement(By.xpath(element)).click();
            // driver.manage().timeouts().implicitlyWait(1, TimeUnit.SECONDS);
            if (driver.findElement(By.xpath(element)).isSelected()) {
                flag = false;
                System.out.println("element already clicked");
            }

            // driver.manage().timeouts().implicitlyWait(1, TimeUnit.SECONDS);
            System.out.println("trying to click the element");
        }
        System.out.println("Clicking the element");
    }
}

Answer 1

尝试“driver.findElement(By.xpath(element)).size()>0”。以我的经验，如果你做的一切都是正确的，但仍然面临元素问题，这是可行的。

Answer 2

Though the size() works for webelements, you could pass your single element in the locator
wait.until(new ExpectedCondition<Boolean>() 
        {
            public Boolean apply(WebDriver webDriver) 
            {
                return verifyWebElementListIsPresent(se.driver().findElements(locator));
            }
        });   
 public boolean verifyWebElementListIsPresent(List<WebElement> element)
    {
        List<WebElement> adminPermissions = element;
        if (adminPermissions.size() > 0)
        {
            System.out.println("Element is displayed on the page");
            return true;    
        }
        else
        {
            System.out.println("Element is not displayed on the page");
            return false;
        }  
    }

Answer 3

public static WebElement elementExists(String xpath){
        // make sure driver is available to this method..
        WebDriverWait wait = new WebDriverWait(driver, 2); //Increase wait time if required                                                                               
        try {
            wait.until(ExpectedConditions.presenceOfElementLocated(By.xpath(xpath)));
            System.out.println("Element having xpath - "+xpath+" is present!");
            return driver.findElement(By.xpath(xpath));  
        }catch(ElementNotFoundException e1){
            System.out.println("Element having xpath - "+xpath+" is not present!");
            return null;
        } catch (TimeoutException e) {
            System.out.println("Element having xpath - "+xpath+" is not present!");
            return null;
        }
    }

• WebElement xyz = elementExists(传递 xpath 字符串);

• 如果找到web element，则返回web element，否则返回null。

• 如果存在网络元素，请检查是否显示以供使用。 webelement.isDisplayed() 应该返回 true。