jquery repeat text search and cut

How jquery search a repeat text and get row id of other repeat row.

<tr id='1'>
   <td>AA</td>
</tr>
<tr id='2'>
   <td>BB</td>
</tr>
<tr id='3'>
   <td>AA</td>
</tr>
<tr id='4'>
   <td>AA</td>
</tr>
<tr id='5'>
   <td>BB</td>
</tr>
<tr id='6'>
   <td>CC</td>
</tr>
<tr id='7'>
   <td>BB</td>
</tr>

for exam开发者_Go百科ple I want id 3,4(for AA) 5,7(for BB) and no id for CC because is no repeat. thank you.

Something like this should work:

function repeats() {
    var seen = {};
    var ids = [];

    jQuery("tr").each(function() {
        var text = jQuery(this).find("td").text();

        if(!seen[text]) {
            seen[text] = 1;
        }

        else {
            seen[text]++;
        }

        if(seen[text] > 1) {
            ids.push(this.id);
        }
    });

    return ids;
}

Fiddle here

Something like this...

$('tr td').each(function(){
    var a = $(this).parent().attr('id');
    if($(this).text() == 'AA'){
        document.write(a + '<br />');
    }
});

Example: http://jsfiddle.net/jasongennaro/GDEWm/1/