java - 尽管不再有 WebElement，循环 List 仍不会停止

Question

我想在 YouTube 评论页面上按此顺序单击这三个不同的网络元素 showmorebutton、viewrepliesbutton、readmorebutton(例如 https://www.youtube.com/watch?v=VtTRcWXSBwc )。

下面是我编写的代码。

//iterate through the comments 
//for(int j=0; j <= commententry.size(); j++){
for (WebElement comment : commententry) {
    boolean clickMore = true;

    try {
        while(clickMore == true) {
            //int counting = 0;
            //if (counting == j){
                //find web elements by class name                       
                List<WebElement> viewrepliesbutton  = comment.findElements(By.xpath("//a[@class='show-more']//span[@class='sprite_caret down']")); //view replies
                List<WebElement> readmorebutton = comment.findElements(By.className("comment-text-toggle")); //read more
                List<WebElement> showmorebutton =  dr.findElements(By.xpath("//div[contains(@id,'yt-comments-paginator')]")); //show more

                try{
                    //click more comments
                    if(showmorebutton.size() > 0) {
                        for (WebElement showmore_element : showmorebutton ) {                                                      
                            Utility.click(showmore_element); //click on button if found
                            System.out.println("show more ");
                            Thread.sleep(3000); //pause for 5 seconds                      
                        }
                    } else clickMore = false; 

                    for (WebElement viewreplies_element : viewrepliesbutton ) {                                           
                                Utility.click(viewreplies_element); //click on button if found
                                System.out.println("view replies");
                                Thread.sleep(3000); //pause for 5 seconds                     
                    } 

                    for (WebElement readmore_element : readmorebutton){    
                        Utility.click(readmore_element); //click on button if found
                        System.out.println("read more");
                        Thread.sleep(3000); //pause for 5 seconds
                    }

                //j++;
                } catch(Exception e){
                    Logger.getLogger(ExpandYoutube.class.getName()).log(Level.SEVERE, "Oops, something happened!", e);
                }
            //} else break;  
        }
    } catch (NoSuchElementException e) { //when no elements are found
        Logger.getLogger(ExpandYoutube.class.getName()).log(Level.SEVERE, "Oops, something happened!", e);
    }      
}   

问题:即使页面上不再有 WebElement，循环仍然继续，已添加 else break; 、 else clickMore = false; code> 停止循环但失败。

输出在这种情况下，应该在循环的第二次停止，但继续进行第三次和第四次循环。

    run:
    .
    Page Loaded.
    Pausing for 5 seconds:  1 2 3 4 5
    [[[FirefoxDriver: firefox on WINDOWS (279f52ea-c071-45c9-96d4-6339a22d5a51)] -> xpath: //div[@class='comment-replies-header']], [[FirefoxDriver: firefox on WINDOWS (279f52ea-c071-45c9-96d4-6339a22d5a51)] -> xpath: //div[@class='comment-replies-header']], [[FirefoxDriver: firefox on WINDOWS (279f52ea-c071-45c9-96d4-6339a22d5a51)] -> xpath: //div[@class='comment-replies-header']], [[FirefoxDriver: firefox on WINDOWS (279f52ea-c071-45c9-96d4-6339a22d5a51)] -> xpath: //div[@class='comment-replies-header']], [[FirefoxDriver: firefox on WINDOWS (279f52ea-c071-45c9-96d4-6339a22d5a51)] -> xpath: //div[@class='comment-replies-header']], [[FirefoxDriver: firefox on WINDOWS (279f52ea-c071-45c9-96d4-6339a22d5a51)] -> xpath: //div[@class='comment-replies-header']]]
    show more 
    view replies
    view replies
    view replies
    view replies
    view replies
    view replies
    show more 
    view replies
    view replies
    view replies
    view replies
    view replies
    view replies
    view replies
    view replies
    view replies
    view replies
    show more 
    view replies
    view replies
    view replies
    view replies
    view replies
    view replies
    view replies
    view replies
    BUILD STOPPED (total time: 4 minutes 12 seconds)

Answer 1

您应该进行迭代，直到 showmorebutton 可见，在循环内单击 readmorebutton 和 viewrepliesbutton。请参阅下面的代码来给出一个想法:

wait.until(ExpectedConditions.visibilityOfElementLocated(By.id("yt-comments-list")));

try {
    while (dr.findElements(By.xpath("//div[@id='yt-comments-paginator']")).size() > 0) {
        System.out.println("show more ");
        dr.findElement(By.xpath("//div[@id='yt-comments-paginator']")).click();
        Thread.sleep(3000); //pause for 5 seconds
    }
} catch(Exception e){
    Logger.getLogger(ExpandYoutube.class.getName()).log(Level.SEVERE, "Oops, something happened!", e);
}

List<WebElement> readmorebutton = dr.findElements(By.className("comment-text-toggle")); 
List<WebElement> viewrepliesbutton = dr.findElements(By.xpath("//a[@class='show-more']//span[@class='sprite_caret down']")); 

for (WebElement viewreplies_element : viewrepliesbutton ) {                                           
    Utility.click(viewreplies_element); //click on button if found
    System.out.println("view replies");
    Thread.sleep(3000); //pause for 5 seconds                     
} 

for (WebElement readmore_element : readmorebutton){    
    Utility.click(readmore_element); //click on button if found
    System.out.println("read more");
    Thread.sleep(3000); //pause for 5 seconds
}