HTML DOM Dialog open Property

Last Updated : 22 Jun, 2023

The DOM Dialog open Property is used to set or return whether the dialog box should be open or not. It is new in HTML5 If open, it means the user can interact with it.

Syntax:

It returns the open property:

dialogObject.open

It sets the open property:

dialogObject.open = true|false

Property Values: It accepts two values i.e. true|false which specifies whether a dialog window should be open or not. By default, it is false.

true: It states that the dialog window is open.
false: It states that the dialog window is not open.

Example 1: This example returns the value of Dialog open property.

HTML

<!DOCTYPE html>
<html>
 
<body>
    <h3> HTML DOM Dialog open Property</h3>
    <dialog id="Dialog" style="color:green">
        Welcome to GeeksforGeeks
      </dialog>
    <button onclick="openDialog()">
        Get the value of open property 
      </button>
    <p id="geeks"> </p>
 
    <script>
        function openDialog() {
            let gfg = 
                document.getElementById("Dialog").open;
            document.getElementById("geeks").innerHTML = gfg;
        }
    </script>
</body>
</html>

Output:

Example 2: This example sets the value of Dialog open property.

HTML

<!DOCTYPE html>
<html>
 
<body>
    <h3> HTML DOM Dialog open Property</h3>
    <dialog id="Dialog" style="color:green">
        Welcome to GeeksforGeeks
      </dialog>
    <button onclick="openDialog()">
        Set the value of open property 
      </button>
    <p id="geeks"> </p>
 
    <script>
        function openDialog() {
            let gfg = 
             document.getElementById("Dialog").open = true;
            document.getElementById("geeks").innerHTML = gfg;
        }
    </script>
</body>
</html>