Let's have a look at the code which will create a confirmation dialog box with an alert of what users click in the dialog box.
     - <html>  
-   
-   <body>  
-     <p>Click the button to display a confirmation box.</p>  
-     <button onclick="myBox()">Click it</button>  
-     <p id="function"></p>  
-     <script>  
-     function myBox() {  
-       var x;  
-       var y = confirm("Click a button!");  
-       if (y == true) {  
-         x = "You clicked OK button!";  
-       } else {  
-         x = "You clicked Cancel button!";  
-       }  
-       document.getElementById("function").innerHTML = x;  
-     }  
-     </script>  
-   </body>  
-   
- </html> 
     
 
 
Output
 
 
After clicking the button the dialog box will be shown.
 
 
When you click the OK or Cancel button the following output will be shown.