twitter bootstrap - Change element text but leave inner span (or add span back) in jQuery -

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i have bootstrap dropdown user selects "past", "this", or "next". 

<div class="btn-group dropup three" role="group">   <button type="button" class="btn btn-default dropdown-toggle" id="tpn" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">       <span class="caret"></span>   </button>   <ul class="dropdown-menu fullwidth">     <li><a onclick="setpast()">past</a></li>     <li><a onclick="setthis()">this</a></li>     <li><a onclick="setnext()">next</a></li>   </ul>  </div>

when option clicked calls appropriate function change text open button. example:

function setpast(){    $('#tpn').text("past"); }

however, function strips away span tag

<span class="caret"></span>

i can not figure out how add span. have tried:

$('#tpn').append("<span class="caret"></span>");

and 

$("tnp").text('new-text').append($('<span></span>').addclass('caret'));

how can add span, or better yet, can keep being removed in first place?

just put text in span.

  <button type="button" class="btn btn-default dropdown-toggle" id="tpn" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">     <span class="text">this</span>     <span class="caret"></span>   </button>

fiddle: https://jsfiddle.net/udzztobp/2/


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