jQuery - adding checkboxes in a specific table -


i'm stuck small jquery script. want make checkboxes rows of specific table. greasemonkey script, can't edit source of site.

this how html set up: 

<html>   <head></head>   <body>      <table class = test1></table>      <table class = test2></table>      <table class = goal>        <thead>          some <tr>         </thead>        <tbody>          here table rows want put checkboxes        </tbody>      </table>   </body> </html>

the problem that, puts checkboxes in rows @ every "tr" can find in tables. , code:

var $ = unsafewindow.jquery  $(document).ready(function (){   $("table.goal").ready(function(){     $("tbody").ready(function(){       $("tr").prepend('<td><input type="checkbox" name="x" value="y"></td>');     });   }); });

please, kind explain me, why isn't working intended? in advance.

there no need use table.ready/tbody.ready, have use descendant-selector

$(document).ready(function () {     $("table.goal tbody tr").prepend('<td><input type="checkbox" name="x" value="y"></td>'); });

demo: fiddle

note: if rows created dynamically, dom manipulation need executed after tr's created


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