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JavaScript Reference » Javascript Properties » index 

'index' Example

<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>
<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);


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1.'index' Syntax and Note
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