Javascript – File Upload Form Check When No File Selected


I was about to create a file upload form and want to check whether user has choose a file or not. I have tried using


if (typeof(variable) == 'undefined' || variable == null)

then

if (variable == null)

and many other way, just got luck when using

var filenames = $('#userfile')[0].files;
if (filenames.length > 0)

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