isDisplayed() seems to me not so good approach. get some ideas from wait: exlplicit and implicit wait mechanisms:
Explicit wait
WebDriverWait.until(condition-that-finds-the-element)
Implicit wait
driver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);
Explicit Waits:
WebDriver driver = new FirefoxDriver();
driver.get("http://somedomain/url_that_delays_loading");
WebElement myDynamicElement = (new WebDriverWait(driver, 10))
.until(new ExpectedCondition<WebElement>(){
@Override
public WebElement apply(WebDriver d) {
return d.findElement(By.id("myDynamicElement"));
}});
Implicit Waits:
WebDriver driver = new FirefoxDriver();
driver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);
driver.get("http://somedomain/url_that_delays_loading");
WebElement myDynamicElement = driver.findElement(By.id("myDynamicElement"));
The example what you have given both do exact same thing..
In Explicit wait, WebDriver evaluates the condition every 500
milliseconds by default ..if it is true, it comes out of loop
Where as in ImplicitWait WebDriver polls the DOM every 500
milliseconds to see if element is present..
Difference is
1. Obvious - Implicit wait time is applied to all elements in your
script but Explicit only for particular element
2. In Explicit you can configure, how frequently (instead of 500
millisecond) you want to check condition.
3. In Explicit you can also configure to ignore other exceptions than
"NoSuchElement" till timeout..
you can get some more info here
Also I use fluent wait mechanism for waiting elements get rendered on the page. Actually you pass either css selector either xpath to the function and simply get web element.
public WebElement fluentWait(final By locator){
Wait<WebDriver> wait = new FluentWait<WebDriver>(driver)
.withTimeout(30, TimeUnit.SECONDS)
.pollingEvery(5, TimeUnit.SECONDS)
.ignoring(NoSuchElementException.class);
WebElement foo = wait.until(
new Function<WebDriver, WebElement>() {
public WebElement apply(WebDriver driver) {
return driver.findElement(locator);
}
}
);
return foo; } ;
fluent wait description
hope this comes clear now)
