HTML | DOM Select selectedIndex Property

The Select selectedIndex property in HTML DOM is used to set or return the index of the selected option in a drop-down list. The index of the drop-down list generally starts with 0 and returns -1 if no option is selected. This property returns the index of the first option if the drop-down list allows multiple selections.

Syntax:

It returns the Select selectedIndex property.
```
selectObject.selectedIndex
```
It is used to set the Select selectedIndex property.
```
 selectObject.selectedIndex = number 
```

Property Values: It contains single value number which is used to specify the index of the selected option in a drop-down list.

Below program illustrates the Select selectedIndex property in HTML DOM:

Example: This example uses Select selectedIndex property to select the <option> element with index “3”.

<!DOCTYPE html> 
<html> 
      
<head>  
    <title> 
        HTML DOM Select selectedIndex Property 
    </title>  
</head> 
  
<body style="text-align:center;"> 
  
    <h1 style="color:green;"> 
        GeeksforGeeks 
    </h1>  
      
    <h2 style="font-family: Impact;"> 
        Select selectedIndex Property 
    </h2><br> 
      
    Select your preferred course from the drop-down list:<br> 
      
    <select name="Courses Titles" id="myCourses"> 
        <option value="C++">c++</option> 
        <option value="Placement">Placement</option> 
        <option value="Java">Java</option> 
        <option value="Python">Python</option> 
    </select> 
      
    <p> 
        To select the option element with index "3", 
        double-click the "Return Element" button. 
    </p> 
      
    <button ondblclick="myGeeks()"> 
        Return Element 
    </button> 
      
    <!-- This example uses Select selectedIndex Property -->
    <script> 
        function myGeeks() { 
            document.getElementById("myCourses").selectedIndex 
                    = "3"; 
        } 
    </script> 
</body> 
  
</html>                                                      

Output:
Before Clicking the button:

After Clicking the button:

Supported Browsers: The browser supported by DOM Select selectedIndex property are listed below:

Apple Safari
Internet Explorer
Firefox
Google Chrome
Opera

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