如何使用jQuery克隆和更改表的所有ID？

Question

I want to clone a table and change all its ID's adding a prefix.

In the snippet below I change all tr elements ID's adding the prefix my_ , using .find('tr').each(function() .

With jQuery, how can I add a prefix name to all ID's of a table during the clone?

 var $newTable = $('table.copyable:first').clone(); $newTable.removeClass('copyable'); $newTable .find('tr') .each(function() { $(this).attr('id', 'my_'+$(this).attr('id')); }); $('#list-player-songs').html(''); $newTable.appendTo($('#list-player-songs')); 

 table.copyable { background: antiquewhite; } table td { border:1px solid; } 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <h3>Original table</h3> <table class="copyable"> <tbody class="sortable"> <tr id="track251"> <td><div data-track-name="love.mp3" id="play251"></div></td> <td id="song-url251">love</td> </tr> <tr id="track241"> <td><div data-track-name="hate.mp3" id="play241"></div></td> <td id="song-url241">hate</td> </tr> <tr id="track233"> <td><div data-track-name="think.mp3" id="play233"></div></td> <td id="song-url233">think</td> </tr> </tbody> </table> <h3>Copied elements</h3> <div id="list-player-songs"></div> <hr/> <br/><br/><br/> 

Answer 1

Search for all ID's and use attr(function) which will in itself do an each internally

$newTable
    .find('[id]')
    .attr('id', function(_, id){
       return 'new-prefix' + id;
    })

Answer 2

You could search for every element that has the id attr like this:

$newTable
    .find('[id]')
    .each(function() {
        $(this).attr('id', 'my_'+$(this).attr('id'));
    });

That way, it will change the id of every element that has an id set.

Elements that don't have an ID set, wont be changed.