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How to check a button is clicked or not in JavaScript ?

In this article, we will see how to check whether a button is clicked or not using JavaScript. There are two methods to check a button is clicked, i.e. using onclick, and click events.

Method 1: Using onclick Event: First, we will create a button, then use document.querySelector() to select the button element, and after that apply onclick event to check whether the button is clicked or not.

Example:

HTML




<!DOCTYPE html>
<html>
  
<head>
    <title>
        How to check a button is clicked 
        or not in JavaScript? 
    </title>
  
    <style>
        body {
            text-align: center;
        }
  
        h1 {
            color: green;
        }
          
        input[type="button"] {
            padding: 5px 10px;
            margin-top: 10px;
        }
    </style>
</head>
  
<body>
    <h1>neveropen</h1>
  
    <h3>
        How to check a button is clicked 
        or not in JavaScript? 
    </h3>
  
    <input type="button" class="button"
        value="Button" 
        onclick="myGeeks()" >
  
    <script>
        function myGeeks() {
            document.querySelector(".button").onclick = function() {
                alert("Button Clicked");
            }
        }
    </script>
</body>
  
</html>


Output:

 

Method 2: Using click Event: First, we will create a button, then use document.querySelector() to select the button element, and after that apply addEventListener() and click event to check whether the button is clicked or not.

Example:

HTML




<!DOCTYPE html>
<html>
  
<head>
    <title>
        How to check a button is clicked 
        or not in JavaScript? 
    </title>
  
    <style>
        body {
            text-align: center;
        }
  
        h1 {
            color: green;
        }
  
        input[type="button"] {
            padding: 5px 10px;
            margin-top: 10px;
        }
    </style>
</head>
  
<body>
    <h1>neveropen</h1>
  
    <h3>
        How to check a button is clicked 
        or not in JavaScript? 
    </h3>
  
    <input type="button" class="button"
        value="Button" 
        onclick="myGeeks()" >
  
    <script>
        function myGeeks() {
            document.querySelector(".button")
                .addEventListener("click", function() {
                    alert("Button Clicked");
                });
        }
    </script>
</body>
  
</html>


Output:

 

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