Answer by Anton for How to get text from a textbox using javascript

If you're using native javascript you should use this:

var userImgNameElement = document.getElementById("userImgNameId");var userImgNameValue = userImgNameElement.getAttribute("value");

With "onChanged" event:

addEvent(document.getElementById('userImgNameId'), 'change', function(event) {    var userImgNameValue = event.target.getAttribute("value");});