Selenium WebDriver：无法使用webdriver从下拉列表中选择元素

Question

I have two dropdown list in my application, Second dropdown becomes enable after selecting the 1st dropdown. Problem i am facing is my code is able to select the value from the 1st drop down but it is not selecting the value from the 2nd drop down. I am getting error as :

Exception in thread "main" org.openqa.selenium.InvalidElementStateException: Element must not be hidden, disabled or read-only (WARNING: The server did not provide any stacktrace information) Command duration or timeout: 138 milliseconds

I have tried wait as well after selecting the 1st dropdown but still getting this error.

My Java code:

Code for 1st dropdown:

  WebElement combo= d1.findElement(By.name("ctl00$ContentPlaceHolder1$ddlAgency"));
  System.out.println("proerty name for agent:" +combo);
  combo.sendKeys("huma");
  //d1.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);
   Thread.sleep(200);

Code for 2nd drop down:

   WebElement combo1=d1.findElement(By.name("ctl00$ContentPlaceHolder1$ddlCountry"));
   System.out.println("proerty name for country:" +combo1);
   combo1.clear();
   combo1.click();
   combo1.sendKeys("Test");

HTML for the 2nd dropdown:

  <select id="ctl00_ContentPlaceHolder1_ddlCountry" style="width:450px;"       onchange="fillval();" name="ctl00$ContentPlaceHolder1$ddlCountry">

Error: Exception in thread "main" org.openqa.selenium.InvalidElementStateException: Element must not be hidden, disabled or read-only (WARNING: The server did not provide any stacktrace information) Command duration or timeout: 138 milliseconds

Answer 1

Try using the Select Class for the second dropdown.

WebElement combo1 = driver.findElement(By.name(ctl00$ContentPlaceHolder1$ddlCountry));
    Select secondDrpDwn = new Select(combo1);
    secondDrpDwn.selectByValue("Test");

Answer 2

finally i got the work around to my problem. sharing it so that it will help others as well. following code is working for me.

              WebElement dropDownListBox =d1.findElement(By.cssSelector("option[value=\"Please Select Country\"]"));
              dropDownListBox.click();

             WebElement    combo1=d1.findElement(By.name("ctl00$ContentPlaceHolder1$ddlCountry"));
             System.out.println("proerty name for country:" +combo1);
             combo1.click();
             Select secondDrpDwn = new Select(combo1);
             secondDrpDwn.selectByVisibleText("Test");