JavaScript Reference/Javascript Properties/index

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"index" Example

    
<html>
<body>
<select id="myS" size=5>
   <option id="o1">1</option>
   <option id="o2">2</option>
   <option id="o3">3</option>
   <option id="o4">4</option>
   <option id="o5">5</option>
</select>
<input type="button" value="1" onClick="function1(o1);">
<input type="button" value="2" onClick="function1(o2);">
<input type="button" value="3" onClick="function1(o3);">
<input type="button" value="4" onClick="function1(o4);">
<input type="button" value="5" onClick="function1(o5);">
<script language="JavaScript">
    function function1(elem) {
        alert("Index: "+ elem.index);
    }
</script>
</body>
</html>



"index" is applied to

+----------------+--------------------------------------------------------------+
| Applied_To     |<option>                                                      |
+----------------+--------------------------------------------------------------+



"index" Syntax and Note

Note:
Read and write property. 
Specifies the index number of <option> in a <select>.
    
Syntax:
    
document.getElementById("optionID").index = value
document.all.optionID.index = value // IE only
Источник — «http://wbex.ru/index.php?title=JavaScript_Reference/Javascript_Properties/index&oldid=6877»