硒列表<WebElement>總是返回空值

Question

當getoption用於從下拉菜單檢索值時，硒List<WebElement>返回零。

代碼片段：

public class FaceBookdropDownMenu { 
    public static void main(String[] args) throws InterruptedException { 
     System.getProperty("webdriver.gecko.driver", "//usr//local//bin//geckodriver 6"); 
     WebDriver driver = new FirefoxDriver(); 
     driver.manage().window().maximize(); 
     driver.get("https://www.facebook.com/"); 

     WebElement month_dropdown = driver.findElement(By.id("month")); 
     //return a list of month names 
     System.out.println(month_dropdown.getText()); 
     List<WebElement> month_lists = driver.findElements(By.id("month")); 
     int total_month= month_lists.size(); 
     // returns 1 instead of 12 
     System.out.println("Total month count is"+ total_month); 

     for(WebElement ele:month_lists) { 
      String month_name = ele.getText(); 
      System.out.println("Months are:"+ month_name); 
     } 
    } 
} 

==================================== ================================== 我用的是getOptions()，但它不工作，要麼

WebElement month_dropdown =driver.findElement(By.id("month")); 
System.out.println(month_dropdown.getText()); 
Select month_dd = new Select(month_dropdown); 
List <WebElement> month_lists = month_dd.getOptions();  
int total_month= month_lists.size(); 
//Zero is returned instead of 12 
System.out.println("Total month count is"+ total_month); 

for(WebElement ele:month_lists) { 
    String month_name = ele.getText(); 
    System.out.println("Months are:"+ month_name); 
} 

Answer 1

下面的代碼爲我工作：

import java.util.List; 
import java.util.Random; 
import java.util.concurrent.TimeUnit; 

import org.openqa.selenium.By; 
import org.openqa.selenium.WebDriver; 
import org.openqa.selenium.WebElement; 
import org.openqa.selenium.chrome.ChromeDriver; 
import org.openqa.selenium.support.ui.ExpectedConditions; 
import org.openqa.selenium.support.ui.Select; 
import org.openqa.selenium.support.ui.WebDriverWait; 

public class FacebookDateSelect { 

    public static void main(String[] args) { 


     WebDriver driver = new ChromeDriver(); 
     driver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS); 
     driver.get("https://www.facebook.com/"); 
     driver.manage().window().maximize(); 

     WebDriverWait wait = new WebDriverWait(driver, 20); 
     WebElement month_dropdown = wait.until(ExpectedConditions.visibilityOfElementLocated(By.id("month"))); 
     Select month_dd = new Select(month_dropdown); 
     List <WebElement> month_lists = month_dd.getOptions();  
     int total_month= month_lists.size(); 
     System.out.println("Total month count is"+ total_month); 

     for(WebElement ele:month_lists) { 
      String month_name = ele.getText(); 
      System.out.println("Months are:"+ month_name); 
     } 

     //updated code - to select random option using Random class 
     month_dd.selectByIndex(new Random().nextInt(user_country.getOptions().size())); 
     driver.quit(); 

    } 

} 

在你的代碼，

List<WebElement> month_lists = driver.findElements(By.id("month")); 

總是返回一個元素，因爲只有一個ID爲month的元素。這確實返回它裏面的選項（使用getOptions方法）

我做的另一個更改是使用WebDriverWait，具有明確的等待條件（直到網頁上顯示月下拉列表），檢查給定的持續時間（ 20秒）。如果在第一秒發現元素，元素將被返回，它不會等到20秒。同樣，如果元素在20秒後未找到，則會拋出異常。

輸出我：

Starting ChromeDriver 2.25.426923 (0390b88869384d6eb0d5d09729679f934aab9eed) on port 6720 
Only local connections are allowed. 
Total month count is13 
Months are:Month 
Months are:Jan 
Months are:Feb 
Months are:Mar 
Months are:Apr 
Months are:May 
Months are:Jun 
Months are:Jul 
Months are:Aug 
Months are:Sept 
Months are:Oct 
Months are:Nov 
Months are:Dec