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Javascript | Window prompt() Method

  • Difficulty Level : Easy
  • Last Updated : 26 Jul, 2019

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:




<!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>

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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