Javascript | Window confirm() Method

Last Updated : 26 Jul, 2019

The confirm() method is used to display a modal dialog with an optional message and two buttons, OK and Cancel. It returns true if the user clicks “OK”, and false otherwise. It prevents the user from accessing other parts of the page until the box is closed.

Syntax:

confirm(message)

message is the optional string to be displayed in the dialog.

It returns a boolean value indicating whether OK or Cancel was selected (true means OK and false means that the user clicked cancel).
Example-1:

<!DOCTYPE html>
<html>
  
<head>
    <title>
        Window confirm() Method
    </title>
</head>
  
<body style="text-align: center;">
    <h1 style="color:green;">
            GeeksforGeeks
        </h1>
    <h2>
            Window confirm() Method
        </h2>
    <p>Click the button to display a confirm box.</p>
  
    <button onclick="geek()">Click me!</button>
  
    <script>
        function geek() {
            confirm("Press OK to close this option");
        }
    </script>
</body>
  
</html>

Output:
Before clicking the button:
confirm

After clicking the button:
confirm

Example-2:

<!DOCTYPE html>
<html>
  
<head>
    <title>
        Window confirm() Method
    </title>
</head>
  
<body style="text-align: center;">
    <h1 style="color:green;">
            GeeksforGeeks
        </h1>
    <h2>
            Window confirm() Method
        </h2>
  
    <button onclick="geek()">Click me!</button>
  
    <p id="g"></p>
  
    <script>
        function geek() {
            var doc;
            var result = confirm("Press a button!");
            if (result == true) {
                doc = "OK was pressed.";
            } else {
                doc = "Cancel was pressed.";
            }
            document.getElementById("g").innerHTML = doc;
        }
    </script>
</body>
  
</html>

Output:
Before clicking the button:
confirm
After clicking the button:
confirm

Supported Browsers: The browser supported by window confirm() method are listed below:

Google Chrome
Internet Explorer
Firefox
Opera
Safari

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