In this tutorial, we will see how to create a file upload functionality with progress bar. Progress bar tells us, how much content is uploaded using normal HTML, jQuery, AJAX and PHP (as a back end). I have used a custom CSS styling to create a progress bar and to design other markup elements like list of uploaded images.

File Upload Progess Bar with JavaScript HTML PHP


Before starting this, you should have a basic knowledge of all above mentioned technologies to understand it properly.

Following are the steps:

To create HTML markup using bootstrap: 

Below code is a markup for file upload functionality. Create a new file and save it with the name file-upload-progres-bar.html and copy below code in the same file.

<!DOCTYPE html>
<html>
<head>
    <title>File Upload with Progress Bar</title>
    <!-- Custom stylesheet -->
    <link rel="stylesheet" type="text/css" href="upload-file-progress-bar-style.css">
</head>
<body>
    <div class="container">
        <!-- heading -->
        <h1>File Upload</h1>
        <form action="upload-file.php" method="post" enctype="multipart/form-data" id="upload_file_form" name="upload_file_form">
            <!-- input field -->
            <input type="file" name="files" id="files">
        </form>

        <!-- progress bar of upload status with progress in percent -->
        <div id="progress-files">
            <div class="progress-bar-files"></div >
            <div class="status-files">0%</div>
        </div>
        <!-- list of the files uploaded -->
        <div class="files-list"></div>
    </div>

     <script type="text/javascript" src="jquery.min.js"></script>
    <script type="text/javascript" src="file-upload.js"></script>
</body>
</html>


 To create a JavaScript code using an Ajax to handle file upload from client end (browser):

Now, create a JavaScript file and name it as file-upload.js and Copy the below code in it.

// files upload
        $("#files").on("change", function(){
            $.ajax({
                url: $("#upload_file_form").attr("action"),
                data: new FormData($("#upload_file_form")[0]), // $(form).serialize(),
                type: "post",
                dataType: "JSON",
                cache: false,
                contentType: false,
                processData: false,
                xhr: function(){
                    //upload Progress
                    var xhr = $.ajaxSettings.xhr();
                    if (xhr.upload) {
                        xhr.upload.addEventListener('progress', function(event) {
                            var percent = 0;
                            var position = event.loaded || event.position;
                            var total = event.total;
                            if (event.lengthComputable) {
                                percent = Math.ceil(position / total * 100);
                            }
                    // console.log(percent)
                            //update progressbar
                            $(" .progress-bar-file").css("width", + percent +"%");
                            $(" .status-files").text(percent +"%");
                        }, true);
                    }
                    return xhr;
                },
                mimeType:"multipart/form-data"
               
            }).done(function(response){ //
                if(response.flag){
                    var html = "<a href='" + response.src + "'><img width='200' src='" + response.src + "' alt=''></a>";
                    $(".files-list").append(html);
                }
                // location.reload();
            });
        });

Above code contains the normal ajax call with xhr, which handles the progress of the file upload and shows it in the form of progress bar.

To create a PHP code to handle file upload from server end:

Now, the backend with php. It is useful to save the files either on the server or the database.
<?php
// chekcs whether data for upload exists or not
if(isset($_FILES['files']))
{
  $uploadfile=$_FILES["files"]["tmp_name"]; 
  $folder="uploads/";
  // checks whether file is uploaded or not
  if(move_uploaded_file($_FILES["files"]["tmp_name"], $folder.$_FILES["files"]["name"])){
          echo json_encode(array("flag" => true, "msg" => "File uploaded successfully!", "src" => $folder . $_FILES["files"]['name']));
    } else {
        echo json_encode(array("flag" => false, "msg" => "Failed to upload file..."));
    }
  // echo '<img src="'.$folder."".$_FILES["upload_file"]["name"].'">';
  // exit();
}

?>

So, in this tutorial, we have learnt how to create a file upload functionality with progress bar. Please like and share the post with your friend if you find it useful.