Accessing a javascript method from the cshtml in Asp.net MVC

I have a cshtml file and a button that on click calls a javascript method.

@using (Html.BeginForm("PlayGameRound", "Games", new { id = Model.GameId, 
category = Model.Category }))
{
@Html.AntiForgeryToken()

<div class="form-group">
    <input type="submit" value="Play" style="float: left" id="play" onclick="@Model.Category = play()"/>
</div>

}

This is the javascript file method that is called.

function play() {
if (hideSpin) {
    return category;
  }
}

When i am running my program the javascript method is never called. How would I ensure the method is called when the button is clicked?