C# - Selenium - 如何等待页面完全加载

Question

Due to slow synchronization on my testing website, I need to wait the page until is fully loaded. I have tried several elements waits like:

WebDriverWait wait = new WebDriverWait(driver, TimeSpan.FromSeconds(50));
wait.Until(ExpectedConditions.ElementExists(By.XPath("//input[@placeholder='First Name']"))).SendKeys("FirstName");

Also I have attempt with JavaScript methods like:

public static void WaitForLoadOriginal(IWebDriver driver)
{
    IJavaScriptExecutor js = (IJavaScriptExecutor)driver;
    int timeoutSec = 15;
    WebDriverWait wait = new WebDriverWait(driver, new TimeSpan(0, 0, timeoutSec));
    wait.Until(wd => js.ExecuteScript("return document.readyState").ToString() == "complete");
}

This is the code that i try to select

<select name="question" id="question1" type="text" class="form-control ng-pristine ng-empty ng-invalid ng-invalid-required ng-touched" ng-required="true" 

and this is the exception that i got:

An exception of type 'OpenQA.Selenium.NoSuchElementException' occurred in WebDriver.Support.dll but was not handled in user code $exception {"Cannot locate option with index: 1"} OpenQA.Selenium.NoSuchElementException

If I put Thread.Sleep(20000) in, it works fine. But I don't want to use static waits. Either I am not using the above methods properly, or they are not working. Any help would be appreciated.

Answer 1

As per your code block as you are trying to invoke SendKeys() along WebDriverWait instead of ExpectedConditions clause as ElementExists you sould use the clause ElementToBeClickable as follows :

WebDriverWait wait = new WebDriverWait(driver, TimeSpan.FromSeconds(20));
wait.Until(ExpectedConditions.ElementToBeClickable(By.XPath("//input[@placeholder='First Name']"))).SendKeys("FirstName");

Answer 2

To perform waiting for page to load, this piece of code works with me fine.

protected void WaitForPageLoad()
    {
        wait.Until(driver=>((IJavaScriptExecutor)driver).ExecuteScript("return document.readyState").Equals("complete"));
    }

Thank you