Jquery image upload limit with multiple select

Question

I am using JavaScript to get the selected file extension when uploading image.But I want to set limit to upload only four images in one select.I have enabled the multiple attribute to select multiple images.How can I set limit to upload only four files at one time.My JavaScript code to get selected file extension is like :-

$(document).ready(function(){
  $('#fileupload').change(function(){
   var ext = $(this).val().split('.').pop().toLowerCase();
    if($.inArray(ext, ['gif','png','jpg','jpeg']) == -1) {
        alert("Please select an image.Only (gif, png, jpg, jpeg) types are allowed");
        return false;
      }
   });
});

My html form is like :-

<form method="POST">
  <input id="fileupload" class="image" type="file" name="files[]" multiple>
</form>

Answer 1

As far as I can get from your question that you need to limit the number of files while uploading multiple files, you can validate that on client side using a small javascript. All you need is just to access the length property of the input box for uploading the images.

HTML:

<form method="POST">
    <input id="fileupload" class="image" type="file" name="files[]" multiple="" />
    <div class="validation" style="display:none;"> Upload Max 4 Files allowed </div>
</form>

Javascript:

$('#fileupload').change(function(){
   //get the input and the file list
   var input = document.getElementById('fileupload');
   if(input.files.length>4){
       $('.validation').css('display','block');
   }else{
       $('.validation').css('display','none');
   }
});

Demo

Your other file name extension validation for letting only image files in upload remains the same.