HTML | DOM option index Property

Last Updated : 15 Feb, 2019

The DOM option index Property is used to set or return the index position of option value in a dropdown list. The index starts from zero.

Syntax:

It is used to return the index property.
```
optionObject.index
```
It is used to set the index property.
```
optionObject.index = integer 
```

Property Values:

It defines a integer value of index position of option value in a dropmenu list.

Return Value: It returns a numeric value which represent the index position of a option value.

Example-1: This example illustrates how to return the option value in the DropDown List.

<!DOCTYPE html> 
<html> 
  
<head> 
    <title>DOM option index Property 
  </title> 
    <style> 
        body { 
            text-align: center; 
        } 
          
        h1 { 
            color: green; 
        } 
    </style> 
</head> 
  
<body> 
    <h1>GeeksforGeeks</h1> 
    <h2>DOM option index Property</h2> 
    <select id="GFG"> 
        <option>Choose an option 
      </option> 
        <option value="html">HTML 
      </option> 
        <option value="java">JAVA 
      </option> 
        <option value="C++">C++ 
      </option> 
        <option value="php">PHP 
      </option> 
        <option value="perl">PERL 
      </option> 
    </select> 
    <br> 
    <br> 
    <br> 
    <br> 
    <br> 
    <br> 
    <br> 
    
    <button onclick="myGeeks()">Submit 
  </button> 
    
    <p id="sudo"
       style="font-size:25px; 
              color:green;"> 
  </p> 
    
    <script> 
        function myGeeks() { 
            
            // Return option value. 
            var x = document.getElementById( 
              "GFG").selectedIndex; 
            
            var y = document.getElementById( 
              "GFG").options; 
            
            document.getElementById("sudo").innerHTML =  
              (y[x].text + " is in " + y[x].index + 
               "th " + "index position"); 
        } 
    </script> 
</body> 
  
</html> 

Output:

Before Clicking On Button:

After Clicking On Button :

Example-2: This example illustrates how to display all the indexes position of the Options.

<!DOCTYPE html> 
<html> 
  
<head> 
    <title>DOM option index Property 
  </title> 
    <style> 
        body { 
            text-align: center; 
        } 
          
        h1 { 
            color: green; 
        } 
    </style> 
</head> 
  
<body> 
    <h1>GeeksforGeeks</h1> 
    <h2>DOM option index Property</h2> 
    <select id="GFG"> 
        <option>Choose an option</option> 
        <option value="html">HTML</option> 
        <option value="java">JAVA</option> 
        <option value="C++">C++</option> 
        <option value="php">PHP</option> 
        <option value="perl">PERL</option> 
    </select> 
    <br> 
    <br> 
    <br> 
    <br> 
    <br> 
    <br> 
    <br> 
    <button onclick="myGeeks()">Submit 
  </button> 
    
    <p id="sudo"
       style="font-size:25px; 
              color:green;"> 
    </p> 
    
    <script> 
        function myGeeks() { 
            
            // display all option. 
            var w =  
            document.getElementById("GFG"); 
            
            var txt = 
            "All options in a DropDown list: "; 
            
            var i; 
            for (i = 0; i < w.length; i++) { 
                txt = txt + "\n" + w.options[i].text +  
                  " has index: " + w.options[i].index; 
            } 
            alert(txt); 
        } 
    </script> 
</body> 
  
</html> 