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Handling Alerts & Pops using Selenium WebDriver

Alert is a pop up window that comes up on screen.  Alert is used to give you some kind of information or to ask  for permission to perform certain kind of operations.
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Two types of Alerts dialog box :-
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  1. Windows based alert pop ups
  2. Web based alert pop ups
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Selenium webDriver provides an Alert interface to handle  Web based alert dialogs box. If there is no dialog currently present, and you invoke this API, it throws back a NoAlertPresentException. To handle web based alert pop ups we can use several third party tools available for handling window alert pop ups like Sikuli,AutoIT etc.
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Alter interface provides following methods to handle Web based alert pop ups.
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  1. void accept()
  2. void dismiss()
  3. String getText()
  4. sendKeys(java.lang.String keysToSend) 
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Step 1 :- Switch to Alert pop up

The alert() method is used to switch the control to the recently generated pop up window.
Ex:-
Alert alert = driver.switchTo().alert();
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Step 2 :- Perform following operation on Altert pop ups 

1. alert.accept()
The method is used to accepts the alert thereby clicking on the Ok button.
Ex:-
Alert alert= driver.switchTo().alert();
alert.accept();
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2. alert.dismiss();
The method is used to closes the alert thereby clicking on the Cancel button and hence the operation should not proceed.
Ex:-
Alert alert= driver.switchTo().alert();
alert.dismiss();
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3. alert.getText()
This method isused to get all the text displayed on the alert box.
Ex:-
Alert alert= driver.switchTo().alert();
String alertText = alert.getText();
System.out.println("Alert text is " + alertText);
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4. alert.sendKeys("Password") 
This method is used to enters the specified string pattern into the alert box.
Ex:-
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Alert alert= driver.switchTo().alert();
alert.sendKeys("EnterString")

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