How to Create File Upload Progress Bar Using jQuery and PHP.

It is very simple getting the server file upload process every few second and increasing the bar color using jquery css property. Just take a look at this code.

HTML Code

<form action="upload.php"id="myForm" name="frmupload" method="post" enctype="multipart/form-data">
    <input type="file" id="upload_file" name="upload_file" />
    <input type="submit" name='submit_image' value="Submit Comment" onclick='upload_image_php();'/>
</form>
<div class="progress" id="progress_div">
    <div class="bar" id="bar1"></div>
    <div class="percent" id="percent1">0%</div>
</div>
<div id="output_image"></div>

CSS Code

<style>
    .progress 
    {
      display:none; 
      position:relative; 
      width:400px; 
      border: 1px solid #ddd; 
      padding: 1px; 
      border-radius: 3px; 
    }
    .bar 
    { 
      background-color: #B4F5B4; 
      width:0%; 
      height:20px; 
      border-radius: 3px; 
    }
    .percent 
    { 
      position:absolute; 
      display:inline-block; 
      top:3px; 
      left:48%; 
    }
</style>

jQuery Code

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="http://malsup.github.com/jquery.form.js"></script> 
<script>
    function upload_image_php() 
    {
      var bar = $('#bar');
      var percent = $('#percent');
      $('#myForm').ajaxForm({
        beforeSubmit: function() {
          document.getElementById("progress_div").style.display="block";
          var percentVal = '0%';
          bar.width(percentVal)
          percent.html(percentVal);
        },

        uploadProgress: function(event, position, total, percentComplete) {
          var percentVal = percentComplete + '%';
          bar.width(percentVal)
          percent.html(percentVal);
        },

            success: function() {
          var percentVal = '100%';
          bar.width(percentVal)
          percent.html(percentVal);
        },

        complete: function(xhr) {
          if(xhr.responseText)
          {
            document.getElementById("output_image").innerHTML=xhr.responseText;
          }
        }
      }); 
    }
</script>

PHP Code (upload.php)

<?php
if(isset($_POST['submit_image']))
{
  $uploadfile=$_FILES["upload_file"]["tmp_name"];
  $folder="images/";
  move_uploaded_file($_FILES["upload_file"]["tmp_name"], $folder.$_FILES["upload_file"]["name"]);
  echo '<img src="'.$folder."".$_FILES["upload_file"]["name"].'">';
  exit();
}
?>