Javascript | Window prompt() Method

The prompt() method is used to display a dialog with an optional message prompting the user to input some text. It is often used if the user wants to input a value before entering a page.
It returns a string containing the text entered by the user, or null.

Syntax:

prompt(message, default)
  • message is a string of text to display to the user.It can be omitted if there is nothing to show in the prompt window i.e. it is optional.
  • default is a string containing the default value displayed in the text input field. It is also optional.

Example:



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<!DOCTYPE html>
<html>
  
<head>
    <title>
        Window prompt() Method
    </title>
</head>
  
<body style="text-align: center;">
    <h1 style="color:green;">
        GeeksforGeeks
    </h1>
    <h2>
        Window prompt() Method
    </h2>
  
    <button onclick="geek()">
        Click me!
    </button>
    <p id="g"></p>
  
    <script>
        function geek() {
            var doc = prompt("Please enter some text",
                "GeeksforGeeks");
            if (doc != null) {
                document.getElementById("g").innerHTML =
                    "Welcome to " + doc;
            }
        }
    </script>
</body>
  
</html>

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Output:

Before clicking the button:

prompt


After clicking the Click me! button:

prompt


After pressing the OK button in dialog box:

prompt


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


    

  • Google Chrome
    • 

  • Internet Explorer 
    • 

  • Firefox
    • 

  • Opera 
    • 

  • Safari
    • 




          
          
          

          

    

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Improved By :  Vishal Chaudhary 2