/// <summary>
/// Renders the reCaptcha HTML control.
/// </summary>
/// <param name="htmlHelper"><c>HtmlHelper</c> instance.</param>
/// <param name="htmlAttributes">List of HTML attributes.</param>
/// <param name="parameters"><c>ReCaptchaParameters</c> object.</param>
/// <returns>Returns the reCaptcha HTML control.</returns>
public static MvcHtmlString ReCaptcha(this HtmlHelper htmlHelper, RenderParameters parameters, IDictionary <string, object> htmlAttributes)
{
var builder = new TagBuilder("div");
if (parameters != null)
{
builder.MergeAttributes(parameters.ToDictionary <RenderParameters, string, object>());
}
if (htmlAttributes != null)
{
builder.MergeAttributes(htmlAttributes);
}
string result;
if (!builder.Attributes.TryGetValue("class", out result))
{
result = "g-recaptcha";
builder.AddCssClass(result);
}
if (!result.Contains("g-recaptcha"))
{
builder.AddCssClass("g-recaptcha");
}
return(builder.ToMvcHtmlString(TagRenderMode.Normal));
}
/// <summary>
/// Gets the callback script.
/// </summary>
/// <param name="callback">Name of callback function.</param>
/// <param name="elementId">Id of the placeholder element.</param>
/// <param name="parameters"><c>RenderParameters</c> instance.</param>
/// <returns>Returns the callback script.</returns>
private static string GetCallbackScript(string callback, string elementId, RenderParameters parameters)
{
if (String.IsNullOrWhiteSpace(callback))
{
throw new ArgumentNullException("callback");
}
if (String.IsNullOrWhiteSpace(elementId))
{
throw new ArgumentNullException("elementId");
}
var serialised = parameters == null
? null
: JsonConvert.SerializeObject(parameters.ToDictionary <RenderParameters, string, object>())
.Replace("\"data-", "\"");
var sb = new StringBuilder();
sb.AppendLine(String.Format("var {0} = function() {{", callback));
sb.AppendLine(String.Format("grecaptcha.render(\"{0}\", {1});", elementId, serialised));
sb.AppendLine("};");
return(sb.ToString());
}