Ajax File Upload – Without Refreshing Page

This tutorial is shared for ajax file upload without refreshing the page. You will learn to upload different types of file formats (like jpg, png, gif, pdf, docs, zip, text & more) with some steps that are very simple to understand.

ajax file upload

 

How to Upload File Using jQuery Ajax

Before start coding, you should create the following folder structure.

myproject
  |__uploads/
  |__ajax-script.js
  |__backend-script.php
  |__upload-form.php
  |

 

Learn Also –

Upload File Using PHP

You have to configure the following steps –

1. Create HTML Form

First of all, Configure the following steps to create HTML Form

  • Create an HTML form and it must have the following attributes –
    • method=post – to upload files with security.
    • enctype="multipart/form-data" – It allows us to upload different types of files like images, videos, pdfs, docs, etc.
    • id="uploadFile" – to submit the form using jquery ajax
  • Create file upload input field with attribute type="file"
  • Also, create a  submit button.
  • Include jQuery CDN to execute ajax script
  • Also, Include custom ajax script file ajax-script.js

File Name – upload-form.php

<!DOCTYPE HTML>
<!DOCTYPE html>
<html>
<head>
  <title>AJAX File Upload</title>
</head>
<body>

<form  method="post" enctype="multipart/form-data" id="uploadFile">

    <input type="file" name="file">
    <input type="submit" value="Upload Now" name="submit">
</form>

<div id="alerBox"></div>

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
<script type="text/javascript" src="ajax-script.js"></script>
</body>
</html>

 

2. Write Ajax Script to File Upload

Now, you have to write an ajax script to send a request to the backend script after selecting the file from the local computer.

Configure the following steps to write an ajax script to upload a file

  • Apply submit event to the form id #uploadFile
  • Prevent from reloading page using e.preventDefault()  while pressing submit button
  • Declare formData() object  & assign to a variable formData
  • Send an ajax request to backend-script.php
  • Disable submit button before uploading the file
  • Enable submit button and display success message into div id="alertBox" after uploading the file

File Name – ajax-script.js

  $(document).on('submit','#uploadFile',function(e){
        e.preventDefault();
       var formData = new FormData(this);
        $.ajax({
        method:"POST",
        url: "backend-script.php",
        data:formData,
        cache:false,
        contentType: false,
        processData: false,
         beforeSend:function(){
         $('button[type="submit"]').attr('disabled','disabled');
       },
        success: function(data){
       
        $('button[type="submit"]').removeAttr('disabled');
       
         $('#alertBox').html(data).fadeIn();
      }
           
});
      });

If you want to remove the alert message from the div id="alertBox" after three seconds, you will have to write the following script in backend-script.php file

window.setInterval(function(){
 if ($('#alertBox').css("display") == "block") {
  $('#alertBox').fadeOut(); } 
}, 3000);

 

3. Write PHP Script to upload File on Ajax Request

Now, create a PHP script to upload the file on an ajax request using the following steps –

  • Create a custom function upload_file() 
  • Declare file upload path & file type in an array and assign them to variables
  • Get filename using $_FILES['file']['name'] & temporary file path using $_FILES['name']['name'] and assign both to a variable.
  • Get basename of the selected file using basename() and assign it to a variable $basename
  • Concatenate upload file path & basename to make a complete path.
  • Get file extension using pathinfo($originalPath, PATHINFO_EXTENSION)
  • If the selected file extension is matched with the allowed file extension, upload the file using move_uploaded_file ($tempPath, $originalPath) otherwise, print an alert message
  • At last, call created function upload_file()

File Name – backend-script.php

<?php
upload_file();

function upload_file(){
    $uploadTo = "uploads/"; 
    $allowFileType = array('jpg','png','jpeg','gif','pdf','doc');
    $fileName = $_FILES['file']['name'];
    $tempPath=$_FILES["file"]["tmp_name"];
   
    $basename = basename($fileName);
    $originalPath = $uploadTo.$basename; 
    $fileType = pathinfo($originalPath, PATHINFO_EXTENSION); 
    if(!empty($fileName)){ 
    
       if(in_array($fileType, $allowFileType)){ 
         // Upload file to server 
         if(move_uploaded_file($tempPath,$originalPath)){ 
            echo $fileName." was uploaded successfully";
           // write here sql query to store image name in database
          
          }else{ 
            echo 'File Not uploaded ! try again';
          } 
      }else{
         echo $fileType." file type not allowed";
      }
   }else{  
     echo "Please Select a file";
   }       
}

?>

 

Tutorial Summary

I have provided the standard Ajax File Upload Script. I hope, this tutorial will be helpful for you. If you have any doubt or questions, ask me directly through the comment box. I will definitely reply as soon as possible

Categories Ajax

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