如何使用js，html和css调整此代码以获得默认的折叠视图？

Question

Here is the full code and it has js, css and html. I got this from an online snippet and I am not good with Javascript. Please help!!!

I have this posed on my home page and taking up the space, would be great to have it all collapsed.

 $(document).on('click', '.panel-heading span.clickable', function(e) { var $this = $(this); if (!$this.hasClass('panel-collapsed')) { $this.closest('.panel').find('.panel-body').slideUp(); $this.addClass('panel-collapsed'); $this.find('i').removeClass('glyphicon-chevron-up').addClass('glyphicon-chevron-down'); } else { $this.closest('.panel').find('.panel-body').slideDown(); $this.removeClass('panel-collapsed'); $this.find('i').removeClass('glyphicon-chevron-down').addClass('glyphicon-chevron-up'); } }) 

 .row { margin-top: 40px; padding: 0 10px; } .clickable { cursor: pointer; } .panel-heading span { margin-top: -20px; font-size: 15px; } 

 <link href="http://netdna.bootstrapcdn.com/bootstrap/3.1.0/css/bootstrap.min.css" rel="stylesheet"> <script src="http://code.jquery.com/jquery-1.11.1.min.js"></script> <script src="http://netdna.bootstrapcdn.com/bootstrap/3.1.0/js/bootstrap.min.js"></script> <div class="container"> <div class="row"> <div class="col-md-6"> <div class="panel panel-primary"> <div class="panel-heading"> <h3 class="panel-title">Panel 1</h3> <span class="pull-right clickable"><i class="glyphicon glyphicon-chevron-up"></i></span> </div> <div class="panel-body">Panel content</div> </div> </div> <div class="col-md-6"> <div class="panel panel-success"> <div class="panel-heading"> <h3 class="panel-title">Panel 2</h3> <span class="pull-right clickable"><i class="glyphicon glyphicon-chevron-up"></i></span> </div> <div class="panel-body">Panel content</div> </div> </div> </div> <div class="row"> <div class="col-md-6"> <div class="panel panel-info"> <div class="panel-heading"> <h3 class="panel-title">Panel 3</h3> <span class="pull-right clickable"><i class="glyphicon glyphicon-chevron-up"></i></span> </div> <div class="panel-body">Panel content</div> </div> </div> <div class="col-md-6"> <div class="panel panel-warning"> <div class="panel-heading"> <h3 class="panel-title">Panel 4</h3> <span class="pull-right clickable"><i class="glyphicon glyphicon-chevron-up"></i></span> </div> <div class="panel-body">Panel content</div> </div> </div> </div> </div> 

Answer 1

1. Add this in your css: .closeThisPanel{ display:none; } .closeThisPanel{ display:none; }

2. Add the closeThisPanel class to the panel-body div.

3. Add the panel-collapsed class the the clickable span.

4. Change the icon from glyphicon glyphicon-chevron-up to glyphicon glyphicon-chevron-down

 $(document).on('click', '.panel-heading span.clickable', function(e) { var $this = $(this); if (!$this.hasClass('panel-collapsed')) { $this.closest('.panel').find('.panel-body').slideUp(); $this.addClass('panel-collapsed'); $this.find('i').removeClass('glyphicon-chevron-up').addClass('glyphicon-chevron-down'); } else { $this.closest('.panel').find('.panel-body').slideDown(); $this.removeClass('panel-collapsed'); $this.find('i').removeClass('glyphicon-chevron-down').addClass('glyphicon-chevron-up'); } }) 

 .row { margin-top: 40px; padding: 0 10px; } .clickable { cursor: pointer; } .panel-heading span { margin-top: -20px; font-size: 15px; } .closeThisPanel{ display:none; } 

 <link href="http://netdna.bootstrapcdn.com/bootstrap/3.1.0/css/bootstrap.min.css" rel="stylesheet"> <script src="http://code.jquery.com/jquery-1.11.1.min.js"></script> <script src="http://netdna.bootstrapcdn.com/bootstrap/3.1.0/js/bootstrap.min.js"></script> <div class="container"> <div class="row"> <div class="col-md-12"> <div class="panel panel-success"> <div class="panel-heading"> <h3 class="panel-title">Panel 2</h3> <span class="pull-right clickable panel-collapsed"><i class="glyphicon glyphicon-chevron-down"></i></span> </div> <div class="panel-body closeThisPanel">Panel content</div> </div> </div> </div> </div>