jasny fileinput fixed markup

Fixed jasny fileinput markup/style.

HTML

<link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/jasny-bootstrap/3.0.1-p7/css/bootstrap.min.css">
<script src="http://jasny.github.io/bootstrap/dist/js/jasny-bootstrap.min.js"></script>
<div class="fileinput fileinput-new" data-provides="fileinput">
  <div class="fileinput-preview thumbnail" data-trigger="fileinput" style="width: 200px; height: 150px;"></div>
  <div>
    <span class="btn btn-default btn-file"><span class="fileinput-new">Select image</span><span class="fileinput-exists">Change</span><input type="file" name="..."></span>
    <a href="#" class="btn btn-default fileinput-exists" data-dismiss="fileinput">Remove</a>
  </div>
</div>
    
    
    <button class="check">  Check</button>
    filename:    <div class="filename"> </div>

CSS

/* 
  fix: bootstrap input btn group with multiple buttons
  issue: (http://getbootstrap.com/components/#input-groups-buttons-segmented) you can see an extra left border on the last btn 
*/
.input-group-btn > .btn + .btn {
    margin-left: -5px;
}

/* made select/change button have round corner */
.fileinput-new .input-group .input-group-btn .btn.btn-file {
    -webkit-border-radius: 0 4px 4px 0;
    -moz-border-radius: 0 4px 4px 0;
    border-radius: 0 4px 4px 0;
}

JavaScript

$(".check").on('click', function(){
  $(".filename").text($("input[type='file']").val()); 
});
$(document.body).on("change.bs.fileinput", function(e) {
            var file = $(e.delegateTarget, $("form")).find('input[type=file]')[0].files[0];

            var fileExtension = file.name.split(".");
            fileExtension = fileExtension[fileExtension.length - 1].toLowerCase();

            var arrayExtensions = ["jpg", "jpeg", "png"];

            if (arrayExtensions.lastIndexOf(fileExtension) == -1) {
                alert('Only Images can be uploaded');
            }
            else {
                if (file["size"] >= 2097152 && (fileExtension == "jpg" || fileExtension == "jpeg" || fileExtension == "png")) {
                    alert('Max 2 MB of file size can be uploaded.');
                    $("form").find('input[type=file]')[0].closest('.product-image-input').remove();
                }
            }
        });