Bootstrap tabs - Typeerror .tab is not a function

Question

I am trying to programatically change tabs as below:

<ul class="nav nav-tabs" role="tablist">
    <li class="active"><a href="#step1" data-toggle="tab" >Step 1</a></li>
    <li><a href="#step2" data-toggle="tab" >Step 2</a></li>
</ul>

<div class="tab-content" id="tabs">
    <div id="step1" class="tab-pane fade in active">
    </div>
    <div id="step2" class="tab-pane fade">
    </div>
</div>

JS(upon certain condition):

$('a[href="#step2"]').tab('show');

This does not work and I get the error: TypeError: $(...).tab is not a function

Any ideas?

EDIT:

To be sure, I also included the following in my _Layout file as per bootstrap website:

<!-- Latest compiled and minified CSS -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" integrity="sha384-1q8mTJOASx8j1Au+a5WDVnPi2lkFfwwEAa8hDDdjZlpLegxhjVME1fgjWPGmkzs7" crossorigin="anonymous">

<!-- Optional theme -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap-theme.min.css" integrity="sha384-fLW2N01lMqjakBkx3l/M9EahuwpSfeNvV63J5ezn3uZzapT0u7EYsXMjQV+0En5r" crossorigin="anonymous">

<!-- Latest compiled and minified JavaScript -->
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js" integrity="sha384-0mSbJDEHialfmuBBQP6A4Qrprq5OVfW37PRR3j5ELqxss1yVqOtnepnHVP9aJ7xS" crossorigin="anonymous"></script>

Answer 1

Which browswer are you using? the integrity attribute doesn't seem to be fully integrated yet (see the mozilla compatibility list)

I tried this code without cdn link and worked just fine. on the other hand, with the integrity attribute, i got the same error as you at first, but upon reload it worked (tried on chrome 49 and firefox 45.0.2)