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How do I get the value from a textbox and  assign it to a hiddenField  in JS,  using Html helper hidden field cod?   MVC4 ASP.NET

Last Modified: 2016-02-27
I have a textbox that I would like to assign the values to the hidden field, when i submit the form. How would I do this?  I'm using Html helper  and don't know how to 1, assign a id to it. And 2, how to access the textbox and put it in the hidden field.

Code:  js
<script type="text/javascript">
                    function gqt()
                        var x = document.getElementById("quantity").value;

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Code: view
<form method="post" action="script">

                   @Html.Label("Quantity:") <input id="quantity" type="text" value="1"/>
                   @Html.Hidden("itemNumber", ViewData["numberId"].ToString())
                   @Html.Hidden("quantity", ????)

                   <input class="btn btn-danger" type="submit" value="Add Info" onclick="gqt()" />

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