onclick on tr row

Question

I try to display alert when click on row 

i try this

<table cellspacing="0"
rules="all"
border="1"
id="tabledata"
style="border-collapse:collapse;">
<tr>
<th>ID</th>
<th>Name</th>
<th>DOB</th>
<th>Email</th>
</tr>
<tr>
 <td>237</td>
<td>John</td>
<td>05/04/1981</td>
<td>[email protected]</td>
</tr>
<tr>
<td>238</td>
<td>Tom</td>
<td>11/11/1967</td>
<td>[email protected]</td>
</tr>
</table>

 but when i try this nothing happens check js fiddle

 

https://jsfiddle.net/jjhby695/19/

$("tabledata tr").click(function () {
alert('unitNo');
});