html - Changing innerHTML in javascript removes link -

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i have block of text want keep hidden until user asks view it. html:

    <a href="javascript:toggledisplay('01');">        <div id="title01">             show details        </div>     </a>     <div id="hide01" class="details">         description:     </div>

now, block hiding , showing works fine, when change innerhtml on div title01, no longer remains link.

here's js:

    var div = document.getelementbyid('hide'+div_id);     var title = document.getelementbyid('title'+div_id);      if (div.style.display === 'block')     {         div.style.display = 'none';     }     else     {         div.style.display = 'block';             title.innerhtml = 'hide';     }

since changing innerhtml on div id title01 only, fail understand why doesn't remain link. , can fix that?

use jquery text function change content 

 $('#title01').text("data display");

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