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HTML DOM queryCommandEnabled() Method

  • Last Updated : 07 Jul, 2020

The queryCommandEnabled() method is used to check whether the specified command is enabled by the browser or not.

Syntax:

isEnabled = document.queryCommandEnabled( command );

Parameters:

  • command: It is the command for which support has to be determined.

Return value: It returns a Boolean value that specifies if the command is enabled by the browser. It returns true if the command is enabled and false if the command is disabled.

Example 1: This example shows if the “selectAll” command is enabled or not. We can use this information to execute the command using the execCommand() method or show a message to the user if it is not supported.



HTML




<html>
<!DOCTYPE html>
<html>
  
<head>
    <title>
        HTML DOM queryCommandEnabled() method
    </title>
</head>
  
<body>
    <h1>GeeksforGeeks</h1>
  
    <p>
        A<br>
        B<br>
    </p>
  
    <button onclick="checkCommand()">
        Click
    </button>
  
    <script>
        function checkCommand() {
  
            // Check if the command is
            // enabled using the 
            // queryCommandEnabled() method
            var isEnabled = document
                .queryCommandEnabled("SelectAll");
  
            // Show the output to the console
            console.log(isEnabled);
  
            // Execute the command if the 
            // task is enabled
            if (isEnabled) {
                document.execCommand("SelectAll",
                    false, null);
            }
        }
    </script>
</body>
  
</html>

Output:

Before Clicking the Button:

After Clicking the Button:

Example 2: This example shows the case when this method will return false as the given command is not a valid one.

HTML




<!DOCTYPE html>
<html>
  
<head>
    <title>
        HTML DOM queryCommandEnabled() method
    </title>
</head>
  
<body>
    <h1>GeeksforGeeks</h1>
  
    <p>
        A<br>
        B<br>
    </p>
  
    <button onclick="checkCommand()">
        Click
    </button>
  
    <script>
        function checkCommand() {
  
            // Checking to see if an invalid
            // command is enabled
            var isEnabled =
                document.queryCommandEnabled("Select");
  
            // Show the output to the console
            console.log(isEnabled);
        }
    </script>
</body>
  
</html>
  • Output:

    Before Clicking the Button:
     

  • After Clicking the Button:

Supported Browsers::

  • Google Chrome
  • Edge 12
  • Firefox 41
  • Safari
  • Opera
  • Internet Explorer

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