/// <summary>
/// 异步访问并呈现当前标签实例。
/// </summary>
/// <param name="context">当前HTML标签上下文，包含当前HTML相关信息。</param>
/// <param name="output">当前标签输出实例，用于呈现标签相关信息。</param>
/// .
public override async Task ProcessAsync(TagHelperContext context, TagHelperOutput output)
{
var message = ViewContext.ViewData["BsMessage"] as BsMessage;
IHtmlContent content;
if (!string.IsNullOrWhiteSpace(message?.Message))
{
content = new HtmlString(message.Message);
}
else
{
var tagContent = await output.GetChildContentAsync();
if (tagContent.IsEmptyOrWhiteSpace)
{
output.SuppressOutput();
return;
}
content = tagContent;
}
var builder = new TagBuilder("div");
builder.AddCssClass("alert");
var type = Type ?? message?.Type.ToString();
if (type != null)
{
builder.AddCssClass("alert-" + type.ToLower());
}
if (IsClosable)
{
builder.AddCssClass("alert-dismissible");
}
output.TagName = "div";
output.MergeAttributes(builder);
output.Attributes.SetAttribute("style", context.GetAndAppendStyle("display:block;"));
output.Content.Clear();
output.Content.AppendHtml("<span class=\"alert-message\">");
output.Content.AppendHtml(content);
output.Content.AppendHtml("</span>");
if (IsClosable)
{
output.Content.AppendHtml(
"<button type=\"button\" class=\"close\" data-dismiss=\"alert\" aria-label=\"Close\"><span aria-hidden=\"true\">×</span></button>");
}
}