JavaScript Reference/Javascript Properties/index
"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