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function getValue() {
var x = document.getElementById("testtable")
var trs = x.getElementsByTagName("tr");
var checks = x.getElementsByTagName("input");
var count = trs.length;
alert(count);
var total = 0;
for (var i = 0; i < count; i++) {
if (checks[i].checked == true) {
total = total + parseInt(trs[i].cells[1].innerText, 10);
}
}
alert(total);
}
<table id="testtable" class="style1">
<tr>
<td class="style2">
<input id="Checkbox2" type="checkbox" /></td>
<td>
1</td>
</tr>
<tr>
<td class="style2">
<input id="Checkbox3" type="checkbox" /></td>
<td>
2</td>
</tr>
<tr>
<td class="style2">
<input id="Checkbox4" type="checkbox" /></td>
<td>
3</td>
</tr>
<tr>
<td class="style2">
<input id="Checkbox5" type="checkbox" /></td>
<td>
4</td>
</tr>
<tr>
<td class="style2">
<input id="Checkbox6" type="checkbox" /></td>
<td>
5</td>
</tr>
<tr>
<td class="style2">
<input id="Checkbox12" type="checkbox" /></td>
<td>
6</td>
</tr>
<tr>
<td class="style2">
<input id="Checkbox8" type="checkbox" /></td>
<td>
7</td>
</tr>
<tr>
<td class="style2">
<input id="Checkbox9" type="checkbox" /></td>
<td>
8</td>
</tr>
<tr>
<td class="style2">
<input id="Checkbox10" type="checkbox" /></td>
<td>
9</td>
</tr>
<tr>
<td class="style2">
<input id="Checkbox11" type="checkbox" /></td>
<td>
10</td>
</tr>
</table>