public ActionResult MvcCaptchaLoader()
{
var prevGuid = Request.ServerVariables["Query_String"];
if (!string.IsNullOrEmpty(prevGuid))
Session.Remove(prevGuid);
var options = new MvcCaptchaOptions();
var config = MvcCaptchaConfigSection.GetConfig();
if (config != null)
{
options.TextChars = config.TextChars;
options.TextLength = config.TextLength;
options.FontWarp = config.FontWarp;
options.BackgroundNoise = config.BackgroundNoise;
options.LineNoise = config.LineNoise;
}
var image = new MvcCaptchaImage(options);
Session.Add(
image.UniqueId,
image);
Response.Cache.SetNoStore();
Response.Cache.SetCacheability(HttpCacheability.NoCache);
return Content(image.UniqueId);
}
private static MvcHtmlString MvcCaptcha(this HtmlHelper helper, string actionName, string controllerName,
MvcCaptchaOptions options)
{
if (options == null)
options = new MvcCaptchaOptions();
var image = new MvcCaptchaImage(options);
HttpContext.Current.Session.Add(
image.UniqueId,
image);
var url = new UrlHelper(helper.ViewContext.RequestContext);
var sb = new StringBuilder(1500);
const string copyrightText =
"\r\n<!--MvcCaptcha 1.2 @Webdiyer (http://www.webdiyer.com) update by Jingbo from www.tsharp.org-->\r\n";
sb.Append(copyrightText);
sb.Append("<input type=\"hidden\" name=\"_mvcCaptchaGuid\" id=\"_mvcCaptchaGuid\"");
if (options.DelayLoad)
{
sb.Append(
"/><script language=\"javascript\" type=\"text/javascript\">if (typeof (jQuery) == \"undefined\") { alert(\"")
.Append(CaptchaResource.JQueryNotLoadedPleaseEnsureThat)
.Append(
"\"); } var _mvcCaptchaPrevGuid = null,_mvcCaptchaImgLoaded = false;function _loadMvcCaptchaImage(){");
sb.Append("if(!_mvcCaptchaImgLoaded){$.ajax({type:'GET',url:'");
sb.Append(url.Action("MvcCaptchaLoader", "_MvcCaptcha", new RouteValueDictionary { { "area", null } }));
sb.Append("?'+_mvcCaptchaPrevGuid,global:false,success:function(data){_mvcCaptchaImgLoaded=true;");
sb.Append("$(\"#_mvcCaptchaGuid\").val(data);_mvcCaptchaPrevGuid=data;$(\"#");
sb.Append(options.CaptchaImageContainerId).Append("\").html('");
sb.Append(
CreateImgTag(
url.Action(actionName, controllerName, new RouteValueDictionary { { "area", null } }) + "?'+data+'",
options, null));
sb.Append(
"');}});} };function _reloadMvcCaptchaImage(){_mvcCaptchaImgLoaded=false;_loadMvcCaptchaImage();};$(function(){");
sb.Append("if($(\"#")
.Append(options.ValidationInputBoxId)
.Append("\").length==0){alert(\"")
.AppendFormat(CaptchaResource.Unfound_ValidationInputBoxId_PleaseCheck, options.ValidationInputBoxId)
.Append("\");}");
sb.Append("if($(\"#")
.Append(options.CaptchaImageContainerId)
.Append("\").length==0){alert(\"")
.AppendFormat(CaptchaResource.Unfound_CaptchaImageContainerId_PleaseCheck,
options.CaptchaImageContainerId)
.Append("\");}");
sb.Append("$(\"#").Append(options.ValidationInputBoxId);
sb.Append("\").bind(\"focus\",_loadMvcCaptchaImage)});</script>");
}
else
{
sb.AppendFormat(" value=\"{0}\" />", image.UniqueId);
sb.Append(
CreateImgTag(
url.Action(actionName, controllerName, new RouteValueDictionary { { "area", null } }) + "?" +
image.UniqueId, options, image.UniqueId));
sb.Append(
"<script language=\"javascript\" type=\"text/javascript\">function _reloadMvcCaptchaImage(){var ci=document.getElementById(\"");
sb.Append(image.UniqueId);
sb.Append(
"\");var sl=ci.src.length;if(ci.src.indexOf(\"&\")>-1)sl=ci.src.indexOf(\"&\");ci.src=ci.src.substr(0,sl)+\"&\"+(new Date().valueOf());}</script>");
}
sb.Append(copyrightText);
return MvcHtmlString.Create(sb.ToString());
}