selenium - How to check if an alert exists using WebDriver?

Question

I need to check the existence of Alert in WebDriver.

Sometimes it pops up an alert but sometimes it will not pop up. I need to check if the alert exists first, then I can accept or dismiss it or it will say: no alert found.

Answer 1

public boolean isAlertPresent() 
{ 
    try 
    { 
        driver.switchTo().alert(); 
        return true; 
    }   // try 
    catch (NoAlertPresentException Ex) 
    { 
        return false; 
    }   // catch 
}   // isAlertPresent()

检查此处的链接https://groups.google.com/forum/?fromgroups#!topic/webdriver/1GaSXFK76zY

Answer 2

以下（C# 实现，但在 Java 中类似）允许您确定是否存在警报而没有异常并且不创建WebDriverWait对象。

boolean isDialogPresent(WebDriver driver) {
    IAlert alert = ExpectedConditions.AlertIsPresent().Invoke(driver);
    return (alert != null);
}

Answer 3

我建议使用ExpectedConditions和alertIsPresent()。ExpectedConditions 是一个包装类，它实现了ExpectedCondition接口中定义的有用条件。

WebDriverWait wait = new WebDriverWait(driver, 300 /*timeout in seconds*/);
if(wait.until(ExpectedConditions.alertIsPresent())==null)
    System.out.println("alert was not present");
else
    System.out.println("alert was present");

Answer 4

我发现在(FF V20 & selenium-java-2.32.0)中捕获异常driver.switchTo().alert();非常慢。`Firefox

所以我选择了另一种方式：

    private static boolean isDialogPresent(WebDriver driver) {
        try {
            driver.getTitle();
            return false;
        } catch (UnhandledAlertException e) {
            // Modal dialog showed
            return true;
        }
    }

当您的大多数测试用例都不存在对话框时，这是一种更好的方法（抛出异常很昂贵）。

Answer 5

我建议使用ExpectedConditions和alertIsPresent()。ExpectedConditions 是一个包装类，它实现了ExpectedCondition接口中定义的有用条件。

public boolean isAlertPresent(){
    boolean foundAlert = false;
    WebDriverWait wait = new WebDriverWait(driver, 0 /*timeout in seconds*/);
    try {
        wait.until(ExpectedConditions.alertIsPresent());
        foundAlert = true;
    } catch (TimeoutException eTO) {
        foundAlert = false;
    }
    return foundAlert;
}

---

注意：这是基于 nilesh 的回答，但适用于捕获由 wait.until() 方法抛出的 TimeoutException。

Answer 6

ExpectedConditions已过时，因此：

        WebDriverWait wait = new WebDriverWait(driver, TimeSpan.FromSeconds(15));
        wait.Until(SeleniumExtras.WaitHelpers.ExpectedConditions.AlertIsPresent());

C# Selenium 'ExpectedConditions 已过时'

Answer 7

此代码将检查警报是否存在。

public static void isAlertPresent(){
    try{
    Alert alert = driver.switchTo().alert();
    System.out.println(alert.getText()+" Alert is Displayed"); 
    }
    catch(NoAlertPresentException ex){
    System.out.println("Alert is NOT Displayed");
    }
    }

Answer 8

public static void handleAlert(){
    if(isAlertPresent()){
        Alert alert = driver.switchTo().alert();
        System.out.println(alert.getText());
        alert.accept();
    }
}
public static boolean isAlertPresent(){
      try{
          driver.switchTo().alert();
          return true;
      }catch(NoAlertPresentException ex){
          return false;
      }
}

Answer 9

公共布尔 isAlertPresent() {

try 
{ 
    driver.switchTo().alert(); 
    system.out.println(" Alert Present");
}  
catch (NoAlertPresentException e) 
{ 
    system.out.println("No Alert Present");
}    

}