如何检查元素是否可见

Question

Need your help wanted to check if particular element is visible or not. in the below code I have passed wrong ID so that system will throw NoSuchElementException in the case of correct element it is giving correct answer. But in the case of wrong element it is throwing exception instead of handling it.

Please help in this -

package com;

import java.util.NoSuchElementException;

import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.testng.annotations.Test;
import org.testng.asserts.SoftAssert;

public class Windowgoogle {
    static WebDriver driver;
    static String baseUrl="http:/www.google.co.in";

    @Test
    public void openBrowser()
    {
    driver=new FirefoxDriver();
        driver.get(baseUrl);

        System.out.println(existsElement("qo"));//Adding Invalid ID
    }   

        private boolean existsElement(String id) 
        {
            boolean chk = false;
            try {

                    chk=driver.findElement(By.name(id)).isDisplayed();
                    return chk;
                }  catch (NoSuchElementException e)
                    {
                    return false;//Control should go to catch but exception is not getting handled properly.
                    }



        }



}

Answer 1

You have imported wrong NoSuchElementException. You should have imported

org.openqa.selenium.NoSuchElementException

instead of java.util.NoSuchElementException

Answer 2

Alternatively, you are able to use driver.findElements as a way to determine if the element is present on the page without using the NoSuchElementException.

For this you would use:

private boolean existsElement(String id) {
    return !driver.findElements(By.name(id)).isEmpty();
}

When the method findElements cannot find any elements that match the specified locator, it returns an empty list. It is a very common alternative to catching the NoSuchElementException.

Answer 3

While catching NoSuchElementException works, it's not an elegant solution. Imagine if you have to have this logic in multiple places. The code will be bloated and hard to maintain. You can use helper methods from ExpectedConditions class. This is how you would use it,

WebDriverWait wait = new WebDriverWait(driver,30);

boolean isNotVisible = wait.until(ExpectedConditions.invisibilityOfElementLocated(By.id("foo")));

if(isNotVisible) {
   // do stuff
}

Answer 4

import java.util.NoSuchElementException;
import org.openqa.selenium.*;
import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.testng.annotations.Test;
import org.testng.asserts.SoftAssert;
public class dropdown {
     private static WebDriver driver = new FirefoxDriver() ;
     String Path ="C:\\Users\\VGupta\\Desktop\\testcases\\auto.xlsx";
     @Test
     public void test() throws Exception
    {
            driver.get("http://www.test.com/");
          //Dimension size   = ('900','500');
          driver.manage().window().setSize(new Dimension(1000,1000));
         try{
         driver.findElement(By.id("foo")).click();

          } catch(NoSuchElementException e)
          {
              System.out.println(e.getStackTrace());
          }
}