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<span class="btn btn-default btn-file">
  Browse <input type="file">
</span>

<style>
  .btn-file {
    position: relative;
    overflow: hidden;
  }
  .btn-file input[type=file] {
    position: absolute;
    top: 0;
    right: 0;
    min-width: 100%;
    min-height: 100%;
    font-size: 100px;
    text-align: right;
    filter: alpha(opacity=0);
    opacity: 0;
    outline: none;
    background: white;
    cursor: inherit;
    display: block;
  }
</style>

<script>
  $(document).on('change', '.btn-file :file', function() {
    var input = $(this),
        numFiles = input.get(0).files ? input.get(0).files.length : 1,
        label = input.val().replace(/\\/g, '/').replace(/.*\//, '');
    input.trigger('fileselect', [numFiles, label]);
  });
  
  $(document).ready( function() {
      $('.btn-file :file').on('fileselect', function(event, numFiles, label) {
          
          var input = $(this).parents('.input-group').find(':text'),
              log = numFiles > 1 ? numFiles + ' files selected' : label;
          
          if( input.length ) {
              input.val(log);
          } else {
              if( log ) alert(log);
          }
          
      });
  });
  
  $(document).on('change', '.btn-file :file', function() {
    var input = $(this),
        numFiles = input.get(0).files ? input.get(0).files.length : 1,
        label = input.val().replace(/\\/g, '/').replace(/.*\//, '');
    input.trigger('fileselect', [numFiles, label]);
  });
  
  $(document).ready( function() {
      $('.btn-file :file').on('fileselect', function(event, numFiles, label) {
          
          var input = $(this).parents('.input-group').find(':text'),
              log = numFiles > 1 ? numFiles + ' files selected' : label;
          
          if( input.length ) {
              input.val(log);
          } else {
              if( log ) alert(log);
          }
          
      });
  });
</script>