How To Validate Upload File Type Using Javascript

Today we will see how to validate upload file type using javascript. here, we easily check the selected file extension with allowed file extensions and we can restrict the user to upload only the allowed file types using file upload validation in jquery.

laravel provide in built file type validation in controller but it works server side only it means we can received validation message after form submit, here i will give you example to check file type before submit data in form using javascript.Currently we have checking only specific file extention like ".txt" , ".csv"  etc... or you can use all file types like "image/* ".  

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <title>File upload type validation in javascript - techsolutionstuff.com</title>
  <link href="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css" rel="stylesheet">
  <script src="https://code.jquery.com/jquery-3.5.1.min.js"></script>  
</head>
<body>
  <h3 style="text-align: center;">File upload type validation in javascript - techsolutionstuff.com</h3>
  <div class="col-md-6 col-md-offset-5"><br>
  <input type="file" name="file"  id="filesizecheck"><br>
  <span id="error-message" class="validation-error-label"></span>
  </div>
</body>
</html>
<script type="text/javascript">
  $(document).ready(function(){
    $('#filesizecheck').on('change',function(){
      myfiles = $(this).val();
      var ext = myfiles.split('.').pop();
      if(ext == "txt" || ext == "png"){
        $('#error-message').css("display","none");
      }else{
        $('#error-message').html("Only allow valid file inputs.");
        $('#error-message').css("display","block");
        $('#error-message').css("color","red");
      }
    });
  });
</script>

 

And you will get output like below image.

How_to_validate_max_file_size_using_javascript

 


 

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