HTML | DOM OptionGroup Object

The OptionGroup Object in HTML DOM is used to represent the HTML <optgroup> element. The <optgroup> element can be accessed by using getElementById() method.

Property Values: This object contains two property values which are listed below:

disabled: It is used to set or return whether option-group element is disabled, or not.
label: It is used to set or return the value the label attribute of an option-group element.

Syntax:

document.getElementById("ID");

Where ID is assigned to the <optgroup> element.

Example 1:

<!DOCTYPE html> 
<html> 
    <head> 
        <title>
            HTML DOM Optgroup Object
        </title> 
    </head> 
      
    <body style = "text-align:center;"> 
      
        <h1 style = "color:green;">
            GeeksforGeeks
        </h1> 
          
        <div>
            A computer science portal for geeks 
        </div> 
          
        <h2>DOM OptionGroup Object</h2> 
          
        <select> 
            <optgroup id = "GFG" label = "Programming Languages"> 
                <option value = "C">C</option> 
                <option value = "C++">C++</option> 
                <option value = "Java">Java</optgroup> 
        </select> 
          
        <br><br>
          
        <button onclick = "Geeks()">
            Submit
        </button>
          
        <p id = "sudo"></p>
          
        <script>
            function Geeks() {
                var txt = document.getElementById("GFG").label;
                document.getElementById("sudo").innerHTML = txt;
            }
        </script>
    </body> 
</html>                                  

Output:
before Click on the Button:

After Click on the Button:

Example 2: OptionGroup Object can be created by using the document.createElement Method.

<!DOCTYPE html> 
<html> 
    <head> 
        <title>
            HTML DOM Optgroup Object
        </title> 
    </head> 
      
    <body> 
        <h2>GeeksforGeeks</h1> 
          
        <h2>DOM OptionGroup Object</h2> 
          
        <select id = "GFG"> 
            <option value = "C">C</option> 
            <option value = "C++">C++</option> 
            <option value = "Java">Java</optgroup> 
        </select> 
          
        <br><br>
          
        <button onclick = "Geeks()">
            Submit
        </button>
          
        <script>
            function Geeks() {
                var g = document.getElementById("GFG");
                  
                var f = document.createElement("OPTGROUP");
                  
                f.setAttribute("label", 
                            "Object Oriented Programming");
                              
                f.appendChild(g.options[1]);
                  
                g.insertBefore(f, g.options[1]);
            }
        </script>
    </body> 
</html>                                 