How to detect copy paste commands Ctrl+V, Ctrl+C using JavaScript ?

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In this article, we will detect copy-paste commands Ctrl+V, and Ctrl+C using JavaScript. To detect the combination of keys with “Ctrl”, we use the ctrl property of the keydown event. It returns a “boolean” value to tell if “ctrl” is pressed or not when the key event got triggered.

Syntax:

event.ctrlKey

Return Value:

true: When “ctrl” was pressed.
false: When “ctrl” was not pressed.

Approach: We will follow the following approach:

HTML code: Below is the code for the file “index.html” to detect the combination of “Ctrl+C” and “Ctrl+V”.
CSS code: The following code demonstrates the file “style.css” which is used in the above HTML file.
Javascript code: The following demonstrates the code for the file “script.js” which is used in the above HTML file.

Example: This example shows the use of the above-explained approach.

HTML

<!DOCTYPE html> 
<html lang="en"> 
<head> 
    <meta charset="UTF-8"> 
    <meta name="viewport" 
          content="width=device-width,  
                   initial-scale=1.0"> 
    <meta http-equiv="X-UA-Compatible" 
          content="ie-edge"> 
    <link rel="stylesheet" href="style.css"> 
</head> 
  
<body> 
    <div class="container"> 
        <textarea cols="30" row="5" 
                  placeholder="Enter Text"> 
        </textarea> 
  
        <textarea cols="30" row="5" 
                  placeholder="Paste Text"> 
        </textarea> 
    </div> 
  
    <script src="script.js"></script> 
</body> 
</html>

CSS

.container{ 
   display: flex; 
   flex-direction: column; 
   align-items: center; 
} 
  
textarea{ 
   margin-top: 20px; 
}

Javascript

<script> 
    document.body.addEventListener("keydown", function (ev) { 
      
    // function to check the detection 
    ev = ev || window.event; // Event object 'ev' 
    var key = ev.which || ev.keyCode; // Detecting keyCode 
      
    // Detecting Ctrl 
    var ctrl = ev.ctrlKey ? ev.ctrlKey : ((key === 17) 
    ? true : false); 
      
    // If key pressed is V and if ctrl is true. 
    if (key == 86 && ctrl) { 
    // print in console. 
    console.log("Ctrl+V is pressed."); 
    } 
    else if (key == 67 && ctrl) { 
      
    // If key pressed is C and if ctrl is true. 
    // print in console. 
    console.log("Ctrl+C is pressed."); 
    } 
      
    }, false); 
</script>