javascript - How to jQuery toggle conditionally and add classname? -


i'd have button, when clicked add classname "in" or if "in" exists remove it.

it add "in" class once set doesn't remove when clicked again.

how can add "in" class "collapse" , remove when clicked again?

  $(document.getelementbyid("toggle-expand-sections")).click(function() {      if ($('#toggle-expand-sections').hasclass("enabled")) {        $('#description-form .collapse').addclass("in");      } else {        $('#description-form .collapse').removeclass("in");        $('#toggle-expand-sections').addclass("enabled");      }      $('#toggle-expand-sections .toggle').toggle();    });
#toggle-expand-sections {  	text-align: center;  	margin: 0 auto;  	padding: 2rem;  }    .collapse {  	display: none;  }	    .in {  	display: block !important;  }
<link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet"/>  <link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/js/font-awesome.min.js" rel="stylesheet"/>  <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>    <button id="toggle-expand-sections" class="btn btn-info">    <i class="fa fa-toggle-off toggle" title="expand sections"></i>    <i class="fa fa-toggle-on toggle" style="display: none" title="collapse sections"></i>  </button>    <div class="collapse">    <div class="subheader-description">foo</div>  </div>    <div class="collapse">    <div class="subheader-description">bar</div>  </div>    <div class="collapse">    <div class="subheader-description">baz</div>  </div>

you didn't know .toggle() method...
description: display or hide matched elements.

see how reduces code (and chances of error, logical or syntaxic).

// toggle "expand/collapse sections" button  $('#toggle-expand-sections').on('click', function() {    $(this).find('.toggle').toggle();    $(".collapse").toggle();  });        /*    if ($('#toggle-expand-sections').hasclass("enabled")) {      $('#toggle-expand-sections').removeclass("enabled");      $('.collapse').removeclass("in");    } else {      $('.collapse').addclass("in");      $('#toggle-expand-sections').addclass("enabled");    }  });  */
#toggle-expand-sections {    text-align: center;    margin: 0 auto;    padding: 2rem;  }    .collapse {    display: none;  }    /*  .in {    display: block !important;  }  */
<link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet" />  <link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/js/font-awesome.min.js" rel="stylesheet" />  <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>    <button id="toggle-expand-sections" class="btn btn-info">    <i class="fa fa-toggle-off toggle" title="expand sections"></i>    <i class="fa fa-toggle-on toggle" style="display: none" title="collapse sections"></i>  </button>    <div class="collapse">    <div class="subheader-description">foo</div>  </div>    <div class="collapse">    <div class="subheader-description">bar</div>  </div>    <div class="collapse">    <div class="subheader-description">baz</div>  </div>


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