Selenium2 WebDriver (Page factory) error after a postback (Element not found in the cache) - postback

Question

I'm using Selenium 2 tests (written in C#) that choose values from a "select" control.
Selection causes a post-back to the server, which updates the state of the page.
It s really frustrating because every PostBack occurs this exception
Element not found in the cache - perhaps the page has changed since it was looked up
Just to be precise i use Selenium 2 WebDriver (2.32.0.0)
And for my project i Use Pattern Page Factory
The code looks like that
class RegisterPersonelData
{
private IWebDriver driver;
[FindsBy(How = How.Id, Using = "ctl00_ContentMain_register1_txtName")]
private IWebElement txtLastname;
[FindsBy(How = How.Id, Using = "ctl00_ContentMain_register1_lstDrvLic")]
private IWebElement dlDrive;
private SelectElement selectDrive;
[FindsBy(How = How.Id, Using = "ctl00_ContentMain_register1_lstVeh")]
private IWebElement dlVehicule;
private SelectElement selectVehicule;
public RegisterPersonelData(IWebDriver driver)
{
this.driver = driver;
// initialize elements of the LoginPage class
PageFactory.InitElements(driver, this);
// all elements in the 'WebElements' region are now alive!
// FindElement or FindElements no longer required to locate elements
}
public void fillData(string lastname, string drive, string vehicule)
{
txtLastname.SendKeys(lastname);
this.selectDrive = new SelectElement(dlDrive);
selectDrive.SelectByText(drive);
selectVehicule = new SelectElement(dlVehicule);
IWait<IWebDriver> wait = new WebDriverWait(this.driver, TimeSpan.FromSeconds(Convert.ToInt32(ConfigurationManager.AppSettings["ExpliciteWait"])));
wait.Until(x => selectVehicule.Options.Count > 1);
selectVehicule.SelectByText(vehicule);
}
}
And here the code of main
class Program
{
static void Main()
{
IWebDriver driver = MyWebDriver.GetWebDriver(MyWebDriver.BrowserType.FIFREFOX);
driver.Navigate().GoToUrl("http://...");
...
registerPersonelData.fillData("lastname", "Permis B", "Auto");
}
}
This code doesn t work because one postback is triggered ...
I have try to use one explicite wait but it fails too !
Code use to retrieve one element with explicite wait
public static IWait<IWebDriver> GetWaitWebDriver(IWebDriver driver)
{
IWait<IWebDriver> wait = new WebDriverWait(driver, TimeSpan.FromSeconds(Convert.ToInt32(ConfigurationManager.AppSettings["ExpliciteWait"])));
return wait;
}
public static IWebElement GetElementAndWaitForIt(IWebDriver driver, By by)
{
return GetWaitWebDriver(driver).Until(x =>
{
return x.FindElement(by);
});
}
Someone has one idea to fix it ?

Answer 1

You can re-initialize the elements at the end of the fillData method.
PageFactory.InitElements(driver, this);
You could do it in the main as well with:
PageFactory.InitElements(driver, registerPersonelData);
You could also try adding the following to the field you need to reuse.
[CacheLookup]

Answer 2

I have done a lot of tries and finally i have found something usefull
public static void WaitForAnWebElementDisplayed(IWait<IWebDriver> wait, IWebElement webElement)
{
wait.Until(x => webElement.Displayed);
}
public static void WaitForAnWebElementEnabled(IWait<IWebDriver> wait, IWebElement webElement)
{
wait.Until(x => webElement.Enabled);
}
and Consequently i can wait that the load of page triggered after to have choosen one item in select option is completed !