如果对象在Selenium Webdriver Java中不可见，如何使用xpath验证对象

Question

How can I verify invisible objects which gets enabled only on incorrect data entry (label before textbox eg: login scenario) using xpath in selenium webdriver.

If all labels display with error message (eg username label and password label),I am able to verify and capture text (error messages). xpath Username: .// [@id='loginForm']/p[1]/p/label xpath Password: .// [@id='loginForm']/p[2]/p/label

But if I enter correct Username,Webdriver continue searching for that Xpath for username(.//*[@id='loginForm']/p[1]/p/label) and does not respond.

HTML are visible only if error appears: label class="error" generated="true" for="userName" label class="error" generated="true" for="passwordField

Can anyone help me with this?

Answer 1

Use a WebDriverWait:

WebDriverWait waiting = new WebDriverWait(driver, 15, 100);
waiting.until(ExpectedConditions.invisibilityOfElementLocated(By.xpath("//*[@id='loginForm']/p[1]/p/label")));

The above will create a web driver wait object that will wait for up to 15 second (checking the condition every 100ms) for the element to become invisible. This will pass straight away if the element is already invisible when the line of code is triggered.

Edit based upon comments below

If you are just trying to find out if an element exists of not you can do:

List<WebElement> labelCount = driver.findElements(By.xpath("//*[@id='loginForm']/p[1]/p/label"));

If the size is 0 the label isn't there, else it is there, so something like:

if(labelCount.size() == 0){
    //Get tab text
} else {
    //Enter second field data
}