硒WebDriver上的“ isDisplyed”无法检查WebElement是否存在

Question

I am trying to get the value from UI, using (By.id) locator.getAtrribute("value"),

Issue:

But, when the xpath is not found (web element not present on UI), I need to take the value as '00:00', but I get error as "No Such element"

I need to add a check, to find the webelement is present on UI, if true, get value using getattribute("value") , else return the value as '00:00'

But When using If condition, "(WebelementforUIvalue.isEmpty()" returns '00:00', though the Web element is present on UI. (I need to take 00:00, when there is no element found/present on UI)

String WebelementforUIvalue = driver.findElement(By.id("ctl00_MainContent_AllowanceGridView_SRow"+cellRosterPerioddd+cellRosterPeriodmm+"_"+PayBucket)).getAttribute("value");
if (WebelementforUIvalue.isEmpty()) {
    UIValue = "00.00";  
} else {
    UIValue = WebelementforUIvalue;   
} 
System.out.println(UIValue);

Answer 1

Personally I'd use a try/catch block for this particular case.

try {
    String WebelementforUIvalue = driver.findElement(By.id("ctl00_MainContent_AllowanceGridView_SRow"+cellRosterPerioddd+cellRosterPeriodmm+"_"+PayBucket)).getAttribute("value");
    UIValue = WebelementforUIvalue;
    } 
    catch (NoSuchElementException) {
        UIValue ="00.00";
    }

Answer 2

Try like this instead( Java Code ). :

    try{
       WebElement element = new WebDriverWait(driver,20).until(ExpectedConditions.presenceOfElementLocated(By.id("ctl00_MainContent_AllowanceGridView_SRow"+cellRosterPerioddd+cellRosterPeriodmm+"_"+PayBucket));
       UIValue = element.getAttribute("value");
    }catch(Throwable e){
       UIValue = "00.00";
    }
System.out.println(UIValue);

I have given an explicit timeout of 20 seconds. So, selenium will try to detect the presence of element in 20 seconds. If it doesn't find then it will timeout and send the assign "UIValue" to "00.00" or else if it finds the element it will assign the "value" attribute's content to "UIValue".

Answer 3

you can try it out this way...

String WebelementforUIvalue = null;
try{
    WebelementforUIvalue = driver.findElement(By.id("ctl00_MainContent_AllowanceGridView_SRow"+cellRosterPerioddd+cellRosterPeriodmm+"_"+PayBucket)).getAttribute("value");
   } catch(NoSuchElementException nsee) {
           WebelementforUIvalue = "0.0";
   }
System.out.println(WebelementforUIvalue);

Answer 4

You can handle this in better way using "findElements"(observer 's' at the end). findElements returns the list of elements matching the locating criteria.

List<WebElements> list=driver.findElements(By.id("Your criteria"))
Integer intNoValues=list.size();
if(intNoValues=0)
{  
  UIValue = "00.00";
}
else
{
 UIValue = WebelementforUIvalue;
}

If you want a detailed explanation of findElements, you can watch the below video How to find element which doesnt exist using WebDriver