File Button

File Button

HTML

<div>
  <div style="display:block;text-align:center;margin-top:20%;">
    <img id="img" src="#" alt="your image" />
    <label for="files"> <span class="btn">Select Image</span></label>
    <input style="visibility: hidden; position: absolute;" id="files" class="form-control" type="file" name="files">
  </div>

</div>

CSS

.btn {
  font-family: Arial;
  color: #ffffff;
  font-size: 20px;
  background: #3f88b8;
  padding: 10px 20px 10px 20px;
  text-decoration: none;
}

.btn:hover {
  background: #3cb0fd;
  background-image: -webkit-linear-gradient(top, #3cb0fd, #3498db);
  background-image: -moz-linear-gradient(top, #3cb0fd, #3498db);
  background-image: -ms-linear-gradient(top, #3cb0fd, #3498db);
  background-image: -o-linear-gradient(top, #3cb0fd, #3498db);
  background-image: linear-gradient(to bottom, #3cb0fd, #3498db);
  text-decoration: none;
}

#img {
  max-width: 200px;
  display: none;
}

JavaScript

function readURL(input) {

    if (input.files && input.files[0]) {
        var reader = new FileReader();

        reader.onload = function (e) {
            $('#img').show().attr('src', e.target.result);
        }

        reader.readAsDataURL(input.files[0]);
    }
}

$("#files").change(function(){
    readURL(this);
});