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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>

Output:

Before Clicking On Button:

After Clicking On Button:

Supported Browsers: The browser supported by DOM option index Property are listed below:

  • Google Chrome
  • Internet Explorer
  • Firefox
  • Opera
  • Safari



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