How to change the class of an element based on the class of another

Tag: javascript,jquery,html,css,twitter-bootstrap

I have a list of navigation items where when one is clicked it's status becomes active

$(document).ready(function() {
    $('li').click(function() {
        $('li').removeClass('active');
        $(this).addClass('active');     
    });
});

I have a container div with multiple hidden divs inside and based on the order of the li that is active I want to be able to show the hidden div that is the same order as the li.

<div class="col-md-9">
    <div id="item1">
        <p>Section#1</p>
        <img src="image-plugin.jpg" class="img-responsive">
    </div>
    <div id="item2">
        <p>Section#2</p>
        <img src="image-plugin.jpg" class="img-responsive">
    </div>
    <div id="item3">
        <p>Section#3</p>
        <img src="image-plugin.jpg" class="img-responsive">
    </div>
</div>

So basically if the second li has the active class then I can have the second of the hidden divs be visible.

Ideally a solution that doesn't involve attaching id's to the li's would be best but I've been having trouble achieving this and would appreciate any help possible.

Best How To :

Take a look at this demo bootply. For this HTML:

<div class="col-md-3">
  <ul class="list-group">
    <li class="list-group-item">Item 1</li>
    <li class="list-group-item">Item 2</li>
    <li class="list-group-item">Item 3</li>
  </ul>
</div>
<div class="col-md-9">
    <div id="item1" class="showhide hidden">
        <p>Section#1</p>
        <img src="http://www.placehold.it/350x150" class="img-responsive">
    </div>
    <div id="item2" class="showhide hidden">
        <p>Section#2</p>
        <img src="http://www.placehold.it/350x150" class="img-responsive">
    </div>
    <div id="item3" class="showhide hidden">
        <p>Section#3</p>
        <img src="http://www.placehold.it/350x150" class="img-responsive">
    </div>
</div>

This JS:

$(document).ready(function() {
    $('li').click(function() {
        $('li').removeClass('active');
        $(this).addClass('active');    

      var index = $(this).index();
      $('.showhide').addClass('hidden').eq(index).removeClass('hidden');

    });
});

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