Call a function with onclick() – JavaScript?

JavascriptWeb DevelopmentFront End TechnologyObject Oriented Programming

Let’s say the following is our button −

<button onclick="displayingMessageOnButtonClick()">Press Me</button>

We need to call a function on the click of above 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>
   <p id="showTheTextMessage"></p>
   <button onclick="displayingMessageOnButtonClick()">Press Me</button>
</body>
<script>
   function displayingMessageOnButtonClick() {
      const showMessage = document.getElementById('showTheTextMessage');
      showMessage.innerHTML = 'Welcome to Javascript Program...';
      showMessage.style.display = 'block';
   }
</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 −

Now, press the button. Following is the output −

raja
Published on 03-Oct-2020 15:37:10
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