javascript - How do i define $ in my Js Query -


i trying run jquery perform fixed scroll page can scroll fix portion of page @ top. below jquery, css , html used. please can tell me doing wrong??

jquery error message: uncaught referenceerror: $ not defined

html:

house of ribs: la mango

              <div>               <nav id="main-nav">                   <ul>                       <li>                           <i class="icon ion-search placeholder-icon"></i>                           find hangout spot                       </li>                   </ul>               </nav>               </div>               <span id="mine"></span>

css:

ul{   margin: 0;   color: white;   padding: 5px 20px 5px 20px;   list-style-type: none;   background: #ef5350; } ul li{   display: inline-block;   padding: 6px;   vertical-align: top; } .fixed-nav{   width: 100%;   position: fixed;   top: 0px;   left: 0; }

jquery:

var offset = $('#main-nav').offset(); $(window).scroll(function(){    //$('#mine').text($(document).scrolltop());   $('#main-nav').addclass('fixed-nav');   if($(document).scrolltop() < 10){          $('#main-nav').removeclass('fixed-nav');   } });

first check if jquery has been included, , if you're using prototype (magento uses it) or other library uses $ wrap jquery code withing iife can use $ safely within.

<script src="https://code.jquery.com/jquery-1.12.0.min.js"></script>

javascript

(function($){ //$ jquery    var offset = $('#main-nav').offset();   $(window).scroll(function(){     //$('#mine').text($(document).scrolltop());     $('#main-nav').addclass('fixed-nav');     if($(document).scrolltop() < 10){          $('#main-nav').removeclass('fixed-nav');     }   });  })(jquery);

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