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

queryCommandState · WebPlatform Docs

Returns a Boolean value that indicates the current state of the command.

Method of dom/TextRangedom/TextRange

var result = document.queryCommandState(/* see parameter list */);

Data-type

BSTR

String that specifies a command identifier.

Returns an object of type BooleanBoolean

Boolean

Boolean that returns one of the following possible values:

This example feature tests for window.getSelection and if not available (legacy IE versions) falls back to document.selection to create a range object. Then queryCommandState is used to determine if the range object can execute the 'bold' command.

function makeBold(el){
if(window.getSelection){
    var sel=document.getSelection();
    var range = sel.getRangeAt(0),
    content = range.extractContents(),
    span = document.createElement('b');
    span.appendChild(content);
    var htmlContent = span.innerHTML;
    range.insertNode(span);
}else{
    var sel=document.selection;
    if(sel){
        var rng=sel.createRange();
        if(rng.queryCommandEnabled('bold')){rng.execCommand('bold',false,null);}
    }   
}
}

 Used to add HTML markup to web documents.

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.

• Microsoft Developer Network: [queryCommandState Method Article]

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