JavaScript how does jquery detect a change to a file input element?

I am building an image-upload feature into a web application and am using the following event handler:

$('input:file').change(function(){
    //handle input change
});

I have discovered that the handler is not called if I try to upload the same image twice, which makes sense because technically the input is not changing. But I am wondering, what needs to happen in order for the change to be triggered? Here are some examples of what I am looking for:

  • Change of filename
  • Change of file content regardless of filename
  • Change of filetype

Which of these would cause a file to be received as a changed file? Or are there other scenarios as well?

Answer:1

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