JavaScript - Create an alert on clicking an HTML button

JavascriptWeb DevelopmentFront End TechnologyObject Oriented Programming

To fire an alert on click of a button, use addEventListener(). Let’s say the following is our button on an HTML web page −

<button type="button">Please Press Me</button>

Example

Following is the code −

 Live Demo

<!DOCTYPE html>
<html lang="en">
<head>
   <meta charset="UTF-8">
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <title>Document</title>
</head>
<link rel="stylesheet" href="//code.jquery.com/ui/1.12.1/themes/base/jquery-ui.css">
<script src="https://code.jquery.com/jquery-1.12.4.js"></script>
<script src="https://code.jquery.com/ui/1.12.1/jquery-ui.js"></script>
<body>
   <button type="button">Please Press Me</button>
</body>
<script>
   var pressedButton = document.getElementsByTagName("button")[0];
   pressedButton.addEventListener("click", function (event) {
      alert("You have pressed the button..........")
   })
</script>
</html>

To run the above program, save the file name anyName.html(index.html). Right click on the file and select the option “Open with live server” in VS Code editor −

Output

The output is as follows −

Whenever you press the button, you will get an alert message.

Output

The output is as follows −

raja
Published on 03-Oct-2020 18:57:51
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