Thread.sleep works, but implicit wait, webdriverwait and smooth wait no?

Question

driver.findElement(By.xpath(sOptionPath)).click();  //this option button changes contents of page   
Thread.sleep(4000);
WebElement combo=driver.findElement(By.xpath(sXpath));
Select dropdownvalue = new Select(combo);
        dropdownvalue.selectByVisibleText(sText);

This code above works fine, but if I use wait instead of thread.sleep, I get a StaleElementReferenceException. This is the Free Wait I used:

    Wait<WebDriver> newwait=new FluentWait<WebDriver>(driver).withTimeout(10, TimeUnit.SECONDS).pollingEvery(1, TimeUnit.SECONDS).ignoring(StaleElementReferenceException.class);

        WebElement combo=newwait.until(new ExpectedCondition<WebElement>(){
            @Override
            public WebElement apply(WebDriver driver) {
                return driver.findElement(By.xpath(sXpath));
            }

        });

this finds combobox, but performing any operation on combobox again throws a NoSuchElement or statestate exception. SO I also tried this to select a value from combobox:

    Wait<WebElement> elwait=new FluentWait<WebElement>(combo).withTimeout(10, TimeUnit.SECONDS).pollingEvery(1, TimeUnit.SECONDS).ignoring(StaleElementReferenceException.class,NoSuchElementException.class);

        Boolean a=elwait.until(new Function<WebElement,Boolean>(){
            @Override
            public Boolean apply(WebElement arg0) {
                Select dropdownvalue = new Select(arg0);
                dropdownvalue.selectByVisibleText(sText);
                return true;
            }

        });

This timeout does not work!

How can I do this work and why it does not work, and thread.sleep works. And why is using Thread.sleep a bad practice?

Answer 1

, , 'combo', , ExpectedCondtions.

   Wait<WebDriver> newwait=new FluentWait<WebDriver>(driver).withTimeout(10, TimeUnit.SECONDS).pollingEvery(1, TimeUnit.SECONDS).ignoring(StaleElementReferenceException.class);

        WebElement combo=newwait.until(new ExpectedCondition<WebElement>(){
            @Override
            public WebElement apply(WebDriver driver) {
                WebElement found = driver.findElement(By.xpath(sXpath));
                if (ExpectedConditions.stalenessOf(found).apply(driver)) {
                    return null;
                }
                return found;
            }

        });

2.47.2, FluentWait, , , null -, , , StaleElementException.

 public <V> V until(Function<? super T, V> isTrue) {
    long end = clock.laterBy(timeout.in(MILLISECONDS));
    Throwable lastException = null;
    while (true) {
      try {
        V value = isTrue.apply(input);
        if (value != null && Boolean.class.equals(value.getClass())) {
          if (Boolean.TRUE.equals(value)) {
            return value;
          }
        } else if (value != null) {
          return value;
        }
      } catch (Throwable e) {
        lastException = propagateIfNotIngored(e);
      }

      // Check the timeout after evaluating the function to ensure conditions
      // with a zero timeout can succeed.
      if (!clock.isNowBefore(end)) {
        String toAppend = message == null ?
            " waiting for " + isTrue.toString() : ": " + message;

        String timeoutMessage = String.format("Timed out after %d seconds%s",
            timeout.in(SECONDS), toAppend);
        throw timeoutException(timeoutMessage, lastException);
      }

      try {
        sleeper.sleep(interval);
      } catch (InterruptedException e) {
        Thread.currentThread().interrupt();
        throw new WebDriverException(e);
      }
    }

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. Implicit wait , -, , .

private final WebElement explicitWait(int retries, Predicate<Boolean> test) {
        WebDriverWait wait = new WebDriverWait(driver, retries * getImplicitWait());
        return wait.until(test);
}

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.

Answer 2

Thread.sleep - , . 1 , . , , 10 . 4 , , . , . Thread.sleep . https://selenium.googlecode.com/git/docs/api/java/org/openqa/selenium/support/ui/ExpectedConditions.html

WebDriverWait wait = new WebDriverWait(driver, timeout);
wait.until(ExpectedConditions.elementToBeClickable(By.xpath(sXpath)));

WebElement combo=driver.findElement(By.xpath(sXpath));
Select dropdownvalue = new Select(combo);
dropdownvalue.selectByVisibleText(sText);