on change event for file input element

I have 4 file inputs that I want them trigger upload proccess when their value is changed.I mean when you select a picture and click open on select image dialog, the script to upload the picture be triggered. I've used onchange event but I think this is not the right event:

JS:

$("input[type=file]").on('change',function(){    alert(this.val());//I mean name of the file});

HTML:

<div class="form-group col-md-11 col-md-offset-1"><input type="file" name="photos[]"><input type="file" name="photos[]"><input type="file" name="photos[]"><input type="file" name="photos[]"></div>

What should I do?