C:/Private/OSS/n2cms/github/n2cms/src/Framework/Extensions/Web/Mvc/Html/AjaxExtensions.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web.Mvc;
using System.Web.Mvc.Html;
using System.Web.Routing;

namespace N2.Web.Mvc.Html
{
        public static class AjaxExtensions
        {
                public static IDisposable BeginAsyncAction(this HtmlHelper helper, string actionName)
                {
                        return helper.BeginAsyncAction(actionName, new RouteValueDictionary());
                }

                public static IDisposable BeginAsyncAction(this HtmlHelper helper, string actionName, object routeValues)
                {
                        return helper.BeginAsyncAction(actionName, new RouteValueDictionary(routeValues));
                }

                public static IDisposable BeginAsyncAction(this HtmlHelper helper, string actionName, RouteValueDictionary routeValues)
                {
                        var id = "async" + Guid.NewGuid().ToString().Replace('-', '_');
                        var url = new UrlHelper(helper.ViewContext.RequestContext).Action(actionName, routeValues);

                        var tag = new System.Web.Mvc.TagBuilder("div");
                        tag.Attributes["id"] = id;
                        tag.AddCssClass("async loading");

                        helper.ViewContext.Writer.Write(tag.ToString(TagRenderMode.StartTag));

                        var asyncLoadScript = string.Format(@"<script type='text/javascript'>//<![CDATA[
jQuery(document).ready(function(){{jQuery('#{0}').load('{1}');}});//]]></script>", id, url);

                        var end = tag.ToString(TagRenderMode.EndTag) + asyncLoadScript;
                        
                        return new WritesOnDispose(helper, end);
                }

                class WritesOnDispose : IDisposable
                {
                        HtmlHelper helper;
                        string endHtml;

                        public WritesOnDispose(HtmlHelper helper, string htmlToWrite)
                        {
                                this.helper = helper;
                                this.endHtml = htmlToWrite;
                        }

                        #region IDisposable Members

                        public void Dispose()
                        {
                                helper.ViewContext.Writer.Write(endHtml);
                        }

                        #endregion
                }
        }
}