javascript - Next-Previous button to work in loop using Bootstrap Tab -


currently "previous" button doesn't work in first tab since it's not in loop. how should go setting when visitors click on previous, shows last tab?

html:

<div>     <ul id="wheel-tab" class="nav nav-tabs nav-justified">         <li class="active"><a href="#ocean" data-toggle="tab">ocean</a></li>         <li><a href="#air" data-toggle="tab">air</a></li>         <li><a href="#customs" data-toggle="tab">customs</a></li>         <li><a href="#transport" data-toggle="tab">transport</a></li>     </ul>     <div class="tab-content">         <div id="ocean" class="tab-pane fade in active">             <h2>ocean</h2>             <p>lorem ipsum dolor sit amet, consectetur adipisicing elit, sed eiusmod tempor incididunt ut labore et dolore magna aliqua.</p>         </div>         <div id="air" class="tab-pane fade in active">             <h2>air</h2>             <p>lorem ipsum dolor sit amet, consectetur adipisicing elit, sed eiusmod tempor incididunt ut labore et dolore magna aliqua.</p>         </div>         <div id="customs" class="tab-pane fade in active">             <h2>customs</h2>             <p>lorem ipsum dolor sit amet, consectetur adipisicing elit, sed eiusmod tempor incididunt ut labore et dolore magna aliqua.</p>         </div>         <div id="transport" class="tab-pane fade in active">             <h2>transport</h2>             <p>lorem ipsum dolor sit amet, consectetur adipisicing elit, sed eiusmod tempor incididunt ut labore et dolore magna aliqua.</p>         </div>     </div>     <a class="left carousel-control" href="#" id="wheel-left"role="button" data-slide="prev">         <span class="icon icon-left">prev</span>     </a>     <a class="right carousel-control" href="#" id="wheel-right" role="button" data-slide="prev">         <span class="icon icon-right">next</span>     </a> </div>

js:

var $tabs = $('#wheel-tab li');  $('#wheel-left').on('click', function () {     $tabs.filter('.active').prev('li').find('a[data-toggle="tab"]').tab('show'); });  $('#wheel-right').on('click', function () {     $tabs.filter('.active').next('li').find('a[data-toggle="tab"]').tab('show'); });

demo

you can add check of length respect prev , next , if present continue normal thing else, toggle last/first tabs respectively. take @ solution below , go through comments:

$('#wheel-left').on('click', function() {     var prevlen = $tabs.filter('.active').prev('li').length; //check if prev li present     if (prevlen)         $tabs.filter('.active').prev('li').find('a[data-toggle="tab"]').tab('show');//if yes continue normal tab switch     else         $tabs.filter('li:last').find('a[data-toggle="tab"]').tab('show');//else show last tab });  $('#wheel-right').on('click', function() {     var nextlen = $tabs.filter('.active').next('li').length;//check if next li present     if (nextlen)         $tabs.filter('.active').next('li').find('a[data-toggle="tab"]').tab('show');//if yes continue normal tab switch     else         $tabs.filter('li:first').find('a[data-toggle="tab"]').tab('show');//else show first tab });

updated fiddle


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