how to get entered text box value into javascript method in mvc

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Javascript

MVC3

how to get entered text box value into javascript method in mvc..
my code is
@Html.TextBoxFor(model => model.AppointmentDate, new { id = "AppointmentDate", onPaste = "compute()" }, new { @style = "height:25px;width:100px; border: 1px #ccc solid;" })


<script...
$(document).ready(function () {
function compute() {
var val = document.getElementById("AppointmentDate").value;

var dtdate = new Date(val);

var n = dtdate.getDay();
......

}
});

but i'm not getting any value into that method...