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    <p>Alright, after a lot of fiddling around I came up with the following implementation:</p> <p>The code below is a <code>HtmlHelper</code> called <code>@Html.AutocompleteWithHiddenFor</code>. The HtmlHelper will create an <code>input</code> HTML element with a <code>data-autocomplete-url</code> property based on the <code>controller</code> and <code>action</code> passed in. </p> <p>If the <code>input</code> element needs a <code>value</code> then you can pass that in as well. A <code>HiddenFor</code> will be created for the <code>Model</code> property passed in and a <code>ValidationMessageFor</code> will be created for the <code>Model</code> as well.</p> <p>Now all I have to do is use <code>@Html.AutocompleteWithHiddenFor</code>, and pass in whatever expression I need with the controller and action (and possibly the value) <strong>to get the autocomplete functionality and have the ID pass to the server instead of the text</strong>.</p> <p><strong>jQuery</strong></p> <pre><code>$(function () { function log(id, name) { var hidden = $('#' + name); hidden.attr("value", id); } $('*[data-autocomplete-url]') .each(function () { $(this).autocomplete({ source: $(this).data("autocomplete-url"), minLength: 2, select: function (event, ui) { log(ui.item.id, ui.item.name); }, change: function (event, ui) { if (!ui.item) { this.value = ''; } else { log(ui.item.id, ui.item.name); } } }); }); }); </code></pre> <hr> <p><strong>AutocompleteHelper class</strong></p> <pre><code>public static class AutocompleteHelper { /// &lt;summary&gt; /// Given a Model's property, a controller, and a method that belongs to that controller, /// this function will create an input html element with a data-autocomplete-url property /// with the method the autocomplete will need to call the method. A HiddenFor will be /// created for the Model's property passed in, so the HiddenFor will be validated /// and the html input will not. /// &lt;/summary&gt; /// &lt;returns&gt;&lt;/returns&gt; public static MvcHtmlString AutocompleteWithHiddenFor&lt;TModel, TProperty&gt;(this HtmlHelper&lt;TModel&gt; html, Expression&lt;Func&lt;TModel, TProperty&gt;&gt; expression, string controllerName, string actionName, object value = null) { // Create the URL of the Autocomplete function string autocompleteUrl = UrlHelper.GenerateUrl(null, actionName, controllerName, null, html.RouteCollection, html.ViewContext.RequestContext, includeImplicitMvcValues: true); // Create the input[type='text'] html element, that does // not need to be aware of the model String textbox = "&lt;input type='text' data-autocomplete-url='" + autocompleteUrl + "'"; // However, it might need to be have a value already populated if (value != null) { textbox += "value='" + value.ToString() + "'"; } // close out the tag textbox += " /&gt;"; // A validation message that will fire depending on any // attributes placed on the property MvcHtmlString valid = html.ValidationMessageFor(expression); // The HiddenFor that will bind to the ID needed rather than // the text received from the Autocomplete MvcHtmlString hidden = html.HiddenFor(expression); string both = textbox + " " + hidden + " " + valid; return MvcHtmlString.Create(both); } } </code></pre> <hr> <p><strong>View</strong></p> <pre><code>@Html.LabelFor(model =&gt; model.RouteID, "Route") @Html.AutocompleteWithHiddenFor(model =&gt; model.RouteID, "Route", "GetRoutesByUser") </code></pre> <p>Or if it needs a <em>value</em></p> <pre><code>@Html.LabelFor(model =&gt; model.Route, "Route") @Html.AutocompleteWithHiddenFor(model =&gt; model.RouteID, "Route", "GetRoutesByUser", @Model.RouteName) </code></pre>
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    1. CORemember to add: using System.Web.Mvc; and using System.Web.Mvc.Html;
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    2. COOf course. It wouldn't build otherwise. I omitted them because the code was long enough as is. Visual Studio will let you know what libraries need to be imported as well.
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