Thank you for precision,
This code must work :
Code JAVASCRIPT :
<script>
//initialize our collection
var items = [];
function Selected(e) {
var checked = $(e).is(':checked');
var item = $(e).val();
if (checked){
//add item to collection
items.push(item)
} else {
//delete item from collection
items.pop(item)
}
//show items
alert(items);
}
<script>
Code HTML :
<table>
<tr><th></th><th>Id</th></tr>
<tr><td><input type="checkbox" value="1" onclick="Selected(this)"/></td><td>1</td></tr>
<tr><td><input type="checkbox" value="2" onclick="Selected(this)"/></td><td>2</td></tr>
<tr><td><input type="checkbox" value="3" onclick="Selected(this)"/></td><td>3</td><table><tbody><tr>
</tr></tbody></table></tr></table>