JavaScript Reference/Javascript Properties/selectedIndex

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"selectedIndex" Example

   <source lang="javascript">

<html> <body> <script> function function1(colors) { 

   var col = (colors.options[colors.selectedIndex].value);
   if (col) {
       document.bgColor = col; 
   } 
   alert("SelectedIndex value = "+col);

} </script> <form method="post" action=""> <select name="colors" onChange="function1(this);"> 

   <option value="white" selected>White</option>
   <option value="cyan">Cyan</option>
   <option value="ivory">Ivory</option>
   <option id="myO" value="blue">Blue</option>
   <option value="red">Red</option>
   <option value="lightblue">Lightblue</option>
   <option value="beige">Beige</option>

</select> </form> 


     </source>


"selectedIndex" is applied to

   <source lang="javascript">

+----------------+--------------------------------------------------------------+ | Applied_To |<select> | +----------------+--------------------------------------------------------------+ 

     </source>


"selectedIndex" Syntax and Note

   <source lang="javascript">

Note: Read and write property. The index of the selected <option> element.

Syntax:

document.getElementById("selectID").selectedIndex = value document.all.selectID.selectedIndex = value // IE only 


     </source>
Источник — «http://wbex.ru/index.php?title=JavaScript_Reference/Javascript_Properties/selectedIndex&oldid=7197»