javascript - Jquery - addClass and removeClass not working -


i tried switch class i tag. first tried using jquery ui's switchclass this:

$( "#sidenavicon" ).switchclass('fa-angle-double-right', 'fa-angle-double-left');

this not working. discovered else had problem switchclass , adviced use removeclass , addclass instead, worked him.

however, me not work, , confused now.

$(document).ready(    function() {      $("#sidenav").on("click", function() {        $("#sidenavicon").addclass('fa-angle-double-right').removeclass('fa-angle-double-left');      });    }  );
#sidenav {    background-color: #333333;    color: white;    height: 100vh;    width: 10vw;    position: relative;  }    #sidenav:hover {    cursor: pointer;  }    #sidenaviconwrap {    font-size: 50px;    color: white;    position: absolute;    top: 50%;    left: 50%;    transform: translate(-50%, -50%);  }    #sidenavicon {    color: white;    font-size: 20px;  }
<link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet" />  <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>      <div id="sidenav">    <div id="sidenaviconwrap">      <i id=sidenavicon" class="fa fa-angle-double-left" aria-hidden="true"></i>  	</div>  </div>

update:

it indeed because of missing ". trusted phpstorm find , point out... learned: never trust ide, if have expensive one.

enter image description here

you missing " in <i id=sidenavicon". worked after changed that. if wan tit toggle, go ahead , switch both addclass , removeclass toggleclass.

$(document).ready(    function() {      $("#sidenav").on("click", function() {        $("#sidenavicon").toggleclass('fa-angle-double-right').toggleclass('fa-angle-double-left');      });    }  );
#sidenav {    background-color: #333333;    color: white;    height: 100vh;    width: 10vw;    position: relative;  }    #sidenav:hover {    cursor: pointer;  }    #sidenaviconwrap {    font-size: 50px;    color: white;    position: absolute;    top: 50%;    left: 50%;    transform: translate(-50%, -50%);  }    #sidenavicon {    color: white;    font-size: 20px;  }
<link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet" />  <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>      <div id="sidenav">    <div id="sidenaviconwrap">      <i id="sidenavicon" class="fa fa-angle-double-left" aria-hidden="true"></i>    </div>  </div>


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