NoSuChelementException：没有这样的元素：无法定位元素错误，使用Selenium和Java单击注册按钮

Question

org.openqa.selenium.NoSuchElementException: no such element: Unable to locate element: {"method":"css selector","selector":"*[name='submit']"}
  (Session info: chrome=86.0.4240.198)

有人知道如何解决这个问题吗？

    import org.testng.AssertJUnit;
    import org.openqa.selenium.By;
    import org.openqa.selenium.WebDriver;
    import org.openqa.selenium.WebElement;
    import org.openqa.selenium.chrome.ChromeDriver;
    import org.testng.Assert;
    import org.testng.annotations.Test;
    
    
    public class WebTesting {
        
        @Test
        public void test1() {
            
            System.setProperty("webdriver.chrome.driver", "C:/Users/mtecl/Desktop/Drivers/chromedriver.exe");    // configure path to the driver
            
            WebDriver driver = new ChromeDriver();
            
            driver.get("https://softwaretestinggn8fe.herokuapp.com/");
            
            //Username
            WebElement testUsername = driver.findElement(By.id("firstname")); //id: first name
        
            testUsername.sendKeys("545");
            
            //Button
            driver.findElement(By.name("submit")).click();
            
            String expected = "First Name can only contain characters.";
            String actual = driver.findElement(By.xpath("html/body/div/main/div[2]/form/div[1]/span")).getText();
            
            Assert.assertEquals(expected, actual);
        
        }
    }

Answer 1

要单击元素()signat，需要为elementTobeclickable()导出WebDriverWait，您可以使用以下定位器策略：

>

csssselector：

driver.get("https://softwaretestinggn8fe.herokuapp.com/");
WebElement testUsername = new WebDriverWait(driver, 20).until(ExpectedConditions.elementToBeClickable(By.cssSelector("input#firstname")));
testUsername.sendKeys("545");
testUsername.submit();
System.out.println(new WebDriverWait(driver, 20).until(ExpectedConditions.visibilityOfElementLocated(By.cssSelector("input#firstname +span"))).getText());

XPath：

driver.get("https://softwaretestinggn8fe.herokuapp.com/");
WebElement testUsername = new WebDriverWait(driver, 20).until(ExpectedConditions.elementToBeClickable(By.xpath("//input[@id='firstname']")));
testUsername.sendKeys("545");
testUsername.submit();
System.out.println(new WebDriverWait(driver, 20).until(ExpectedConditions.visibilityOfElementLocated(By.xpath("//input[@id='firstname']//following-sibling::span[1]"))).getText());

First Name can only contain characters.

null