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How I can show JavaScript alert box in the middle of the screen?

To show the JavaScript alert box in the middle, you need to use the custom alert box. Under that, style it accordingly and position it to the center. Use the “top” and “left” CSS properties to achieve this. Set them as 50%, but as you can see a button below, use the property to 40% to align it with the button:

Example

Live Demo

<!DOCTYPE html>
<html>
   <head>
      <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
      <script>
         function functionAlert(msg, myYes) {
            var confirmBox = $("#confirm");
            confirmBox.find(".message").text(msg);
            confirmBox.find(".yes").unbind().click(function() {
               confirmBox.hide();
            });
            confirmBox.find(".yes").click(myYes);
            confirmBox.show();
         }
      </script>
      <style>
         #confirm {
            display: none;
            background-color: #F3F5F6;
            color: #000000;
            border: 1px solid #aaa;
            position: fixed;
            width: 300px;
            height: 100px;
            left: 40%;
            top: 40%;
            box-sizing: border-box;
            text-align: center;
         }
         #confirm button {
            background-color: #FFFFFF;
            display: inline-block;
            border-radius: 12px;
            border: 4px solid #aaa;
            padding: 5px;
            text-align: center;
            width: 60px;
            cursor: pointer;
         }
         #confirm .message {
            text-align: left;
         }
      </style>
   </head>
   <body>
      <div id="confirm">
         <div class="message">This is a warning message.</div><br>
         <button class="yes">OK</button>
      </div>
      <input type="button" value="Click Me" onclick="functionAlert();" />
   </body>
</html>
Updated on 25-Sep-2019 08:53:43

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