【尚未解決】關於webdriver中瀏覽器從頁面回退後通過id/xpath取得元素出錯的問題

背景：在學習用EventFiringWebDriver做事件偵聽時，從豆瓣首頁跳轉到百度首頁，然後navigate().back()回到豆瓣的時候，點擊豆瓣搜索按鈕時，用By.xpath()，就報錯：

org.openqa.selenium.StaleElementReferenceException: Element not found in the cache - perhaps the page has changed since it was looked up

...


但是換成By.name()的時候就沒問題。

代碼爲：

(1)MyEventListener.java

package com.aikachin.selenium;

import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.support.events.AbstractWebDriverEventListener;

/**
 * @Author: AIkachin
 * @Description:
 * @Date: Created in 17:21 2017/10/18 0018.
 * @Modified by :
 */
public class MyEventListener extends AbstractWebDriverEventListener {
    @Override
    public void afterNavigateTo(String url, WebDriver driver) {
        System.out.println("After navigate to : " + url);
    }

    @Override
    public void afterNavigateBack(WebDriver driver) {
        System.out.println("After navigate back to : " + driver.getCurrentUrl());
    }

    @Override
    public void afterClickOn(WebElement element, WebDriver driver) {
        System.out.println("After click on : " + element.getText());
    }
}

(2)testWebDriverEvent.java部分代碼

使用By.name()就沒問題

    @Test
    public void testWebDriverEvent() throws Exception {
        driver = new FirefoxDriver();
        EventFiringWebDriver eventFiringWebDriver = new EventFiringWebDriver(driver);
        MyEventListener myEventListener = new MyEventListener();
        eventFiringWebDriver.register(myEventListener);

        eventFiringWebDriver.get(URLofDouban);
        Thread.sleep(1000);
        eventFiringWebDriver.get(URLofBaidu);
        eventFiringWebDriver.navigate().back();
        Thread.sleep(1000);
        eventFiringWebDriver.findElement(By.xpath(".//*[@id='anony-nav']/div[2]/form/span[2]/input")).click();
        // eventFiringWebDriver.findElement(By.name("q")).click();
    }