File Button

File Button

HTML

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

JavaScript

var file = document.getElementById("files");
file.addEventListener("change", function(){ alert(this.value); });