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Showing content from https://webplatform.github.io/docs/dom/TextRange/queryCommandEnabled below:

queryCommandEnabled · WebPlatform Docs

queryCommandEnabled Summary

Returns a Boolean value that indicates whether a specified command can be successfully executed using execCommand, given the current state of the document.

Method of dom/TextRange dom/TextRange

Syntax

var Result = document.queryCommandEnabled(/* see parameter list */);

Parameters cmdID

Data-type: BSTR

String that specifies a command identifier.

see dottoro.com for a full listing of commands.

Return Value

Returns an object of type BooleanBoolean

Boolean

Boolean that returns one of the following possible values:

Return value Description true The command is enabled. false The command is disabled. Examples

The following example is a onClick handler to execute the 'cut' command.

function execCut(){
if(document.queryCommandEnabled('cut')){
    document.execCommand('cut',false,null);}
}

Notes Remarks

Using queryCommandEnabled ("delete") on a TextRange object returns true, while queryCommandEnabled ("delete") on a Document object returns false. However, execCommand ("delete") can still be used to delete the selected text. This method is a wrapper function for the command constants. You can obtain an IHTMLDocument2 interface using IID_IHTMLDocument2 for the IID. This method is a wrapper function for the command constants. You can obtain an IHTMLControlRange interface using IID_IHTMLControlRange for the IID. This method is a wrapper function for the command constants. You can obtain an IHTMLTxtRange interface using IID_IHTMLTxtRange for the IID.