input value change js code example
Example 1: Javascript get text input value
var inputValue = document.getElementById("myTextInputID").value;
Example 2: js addeventlistener change select
<input id="test" type="text" value="Sélectionnez-moi !" />
<script>
var elem = document.getElementById('test');
elem.addEventListener('select', function() {
alert('La sélection a changé !');
}, false);
</script>