/// <summary>
/// Instantiates a new <see cref="TagHelperExecutionContext"/>.
/// </summary>
/// <param name="tagName">The HTML tag name in the Razor source.</param>
/// <param name="tagMode">HTML syntax of the element in the Razor source.</param>
/// <param name="items">The collection of items used to communicate with other
/// <see cref="ITagHelper"/>s</param>
/// <param name="uniqueId">An identifier unique to the HTML element this context is for.</param>
/// <param name="executeChildContentAsync">A delegate used to execute the child content asynchronously.</param>
/// <param name="startTagHelperWritingScope">
/// A delegate used to start a writing scope in a Razor page and optionally override the page's
/// <see cref="HtmlEncoder"/> within that scope.
/// </param>
/// <param name="endTagHelperWritingScope">A delegate used to end a writing scope in a Razor page.</param>
public TagHelperExecutionContext(
string tagName,
TagMode tagMode,
IDictionary<object, object> items,
string uniqueId,
Func<Task> executeChildContentAsync,
Action<HtmlEncoder> startTagHelperWritingScope,
Func<TagHelperContent> endTagHelperWritingScope)
{
if (startTagHelperWritingScope == null)
{
throw new ArgumentNullException(nameof(startTagHelperWritingScope));
}
if (endTagHelperWritingScope == null)
{
throw new ArgumentNullException(nameof(endTagHelperWritingScope));
}
_tagHelpers = new List<ITagHelper>();
_allAttributes = new TagHelperAttributeList();
Context = new TagHelperContext(_allAttributes, items, uniqueId);
Output = new TagHelperOutput(tagName, new TagHelperAttributeList(), GetChildContentAsync)
{
TagMode = tagMode
};
Reinitialize(tagName, tagMode, items, uniqueId, executeChildContentAsync);
_startTagHelperWritingScope = startTagHelperWritingScope;
_endTagHelperWritingScope = endTagHelperWritingScope;
}
public override async Task ProcessAsync(TagHelperContext context, TagHelperOutput output)
{
var request = ViewContext.HttpContext.Request;
var result = await Prerenderer.RenderToString(
_applicationBasePath,
_nodeServices,
new JavaScriptModuleExport(ModuleName)
{
ExportName = ExportName,
WebpackConfig = WebpackConfigPath
},
request.GetEncodedUrl(),
request.Path + request.QueryString.Value,
CustomDataParameter);
output.Content.SetHtmlContent(result.Html);
// Also attach any specified globals to the 'window' object. This is useful for transferring
// general state between server and client.
if (result.Globals != null)
{
var stringBuilder = new StringBuilder();
foreach (var property in result.Globals.Properties())
{
stringBuilder.AppendFormat("window.{0} = {1};",
property.Name,
property.Value.ToString(Formatting.None));
}
if (stringBuilder.Length > 0)
{
output.PostElement.SetHtmlContent($"<script>{stringBuilder}</script>");
}
}
}
public override async Task ProcessAsync(TagHelperContext context, TagHelperOutput output)
{
var childContent = await output.GetChildContentAsync();
var modalContext = (ModalContext)context.Items[typeof(ModalTagHelper)];
modalContext.Body = childContent;
output.SuppressOutput();
}
public TagHelperContext CreateContext(bool hasMarkdownAttribute)
{
if (hasMarkdownAttribute)
_inputAttributes.Add(new TagHelperAttribute("markdown", ""));
var context = new TagHelperContext(_inputAttributes, _items, Guid.NewGuid().ToString());
return context;
}
public override async Task ProcessAsync(TagHelperContext context, TagHelperOutput output)
{
if (DisplayProperty == null && (DisplayPropertyExplorer == null || DisplayPropertyExpressionOverride==null))
new ArgumentNullException("display-property/display-expression-override+display-explorer");
if (For == null && (ForPropertyExplorer == null || ForExpressionOverride == null))
new ArgumentNullException("asp-for/for-expression-override+for-explorer");
if (string.IsNullOrWhiteSpace(ItemsDisplayProperty)) new ArgumentNullException("items-display-property");
if (string.IsNullOrWhiteSpace(ItemsValueProperty)) new ArgumentNullException("items-value-property");
if (string.IsNullOrWhiteSpace(ItemsUrl)) new ArgumentNullException("items-url");
if (string.IsNullOrWhiteSpace(UrlToken)) new ArgumentNullException("url-token");
if (string.IsNullOrWhiteSpace(DataSetName)) new ArgumentNullException("dataset-name");
if (MaxResults == 0) MaxResults=20;
if (MinChars == 0) MinChars = 3;
var currProvider = ViewContext.TagHelperProvider();
var resolver = jsonOptions.SerializerSettings.ContractResolver as DefaultContractResolver;
var vd = ViewContext.ViewData;
var options = new AutocompleteOptions
{
Generator = generator,
PropertyResolver = resolver != null ? resolver.GetResolvedPropertyName : new Func<string, string>(x => x),
ForcedValueName = currProvider.GenerateNames ? vd.GetFullHtmlFieldName(ForExpressionOverride ?? For.Name) : null,
ForcedDisplayName = currProvider.GenerateNames ? vd.GetFullHtmlFieldName(DisplayPropertyExpressionOverride ?? DisplayProperty.Name) : null,
NoId= !currProvider.GenerateNames || ViewContext.IsFilterRendering()
};
await currProvider.GetTagProcessor(TagName)(context, output, this, options, null);
}
/// <inheritdoc />
public override async Task ProcessAsync(TagHelperContext context, TagHelperOutput output)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
if (output == null)
{
throw new ArgumentNullException(nameof(output));
}
IHtmlContent content = null;
// Create a cancellation token that will be used
// to release the task from the memory cache.
var tokenSource = new CancellationTokenSource();
if (Enabled)
{
var cacheKey = new CacheTagKey(this);
content = await _distributedCacheService.ProcessContentAsync(output, cacheKey, GetDistributedCacheEntryOptions());
}
else
{
content = await output.GetChildContentAsync();
}
// Clear the contents of the "cache" element since we don't want to render it.
output.SuppressOutput();
output.Content.SetHtmlContent(content);
}
public override async void Process(TagHelperContext context, TagHelperOutput output)
{
output.TagName = "div";
output.AppendClass("widget-box");
output.AppendClass(Class);
var originalContent = await output.GetChildContentAsync();
var innerHtml = originalContent.GetContent();
output.Content.Clear();
if (!innerHtml.Contains(WidgetBoxHeaderHelper.HeaderCss))
{
// user is taking easy/lazy way of declaring the widget box
output.Content.AppendHtml(WidgetBoxHeaderHelper.GetFullHeader(Title, IsCollapsible));
var widgetBodyDiv = WidgetBoxBodyHelper.GetFullBodyInternals(Padding, innerHtml);
output.Content.AppendHtml(widgetBodyDiv);
}
else
{
// user is doing the hardwork themselves
output.Content.AppendHtml(innerHtml);
}
base.Process(context, output);
}
public override async void Process(TagHelperContext context, TagHelperOutput output)
{
var originalContent = await output.GetChildContentAsync();
output.AppendClass("form-group");
TagBuilder labelBuilder = null;
if (!originalContent.GetContent().Contains("<label"))
{
labelBuilder = FormGroupLabel.Get(Horizontal, LabelText);
}
var contentDiv = new TagBuilder("div");
if (Horizontal)
{
contentDiv.AddCssClass("col-sm-8");
}
contentDiv.InnerHtml.AppendHtml(originalContent.GetContent());
output.TagName = "div";
output.Content.Clear();
if (labelBuilder != null)
{
output.Content.AppendHtml(labelBuilder);
}
output.Content.AppendHtml(contentDiv);
base.Process(context, output);
}
public override void Process(TagHelperContext context, TagHelperOutput output)
{
if (ShowIfNull != null)
{
output.SuppressOutput();
}
}
public DefaultServerGridProcessor(TagHelperContext context, TagHelperOutput output, GridTagHelper tag, GridOptions options, ContextualizedHelpers helpers)
{
this.context = context; this.output = output; this.tag = tag;
this.options = options; this.helpers = helpers;
basePrefix = tag.For.Name;
AdjustColumns();
}
public override void Process(TagHelperContext context, TagHelperOutput output)
{
output.TagName = "select";
output.TagMode = TagMode.StartTagAndEndTag;
output.AppendClass("form-control");
var optionsList = new List<TagBuilder>();
if (Items == null)
{
Items = new List<SelectListItem>();
}
foreach (var item in Items)
{
var option = new TagBuilder("option");
option.Attributes.Add("value", item.Value);
option.InnerHtml.Append(item.Text);
optionsList.Add(option);
}
optionsList.ForEach(o =>
{
output.Content.AppendHtml(o);
});
base.Process(context, output);
}
public void Reinitialize_AllowsContextToBeReused()
{
// Arrange
var initialUniqueId = "123";
var expectedUniqueId = "456";
var initialItems = new Dictionary<object, object>
{
{ "test-entry", 1234 }
};
var expectedItems = new Dictionary<object, object>
{
{ "something", "new" }
};
var initialAttributes = new TagHelperAttributeList
{
{ "name", "value" }
};
var context = new TagHelperContext(initialAttributes, initialItems, initialUniqueId);
// Act
context.Reinitialize(expectedItems, expectedUniqueId);
// Assert
Assert.Same(expectedItems, context.Items);
Assert.Equal(expectedUniqueId, context.UniqueId);
Assert.Empty(context.AllAttributes);
}
public void Process_DoesNothingIfTagNameIsNull()
{
// Arrange
var tagHelperOutput = new TagHelperOutput(
tagName: null,
attributes: new TagHelperAttributeList
{
{ "href", "~/home/index.html" }
},
getChildContentAsync: (useCachedResult, encoder) => Task.FromResult<TagHelperContent>(null));
var tagHelper = new UrlResolutionTagHelper(Mock.Of<IUrlHelperFactory>(), new HtmlTestEncoder());
var context = new TagHelperContext(
allAttributes: new TagHelperAttributeList(
Enumerable.Empty<TagHelperAttribute>()),
items: new Dictionary<object, object>(),
uniqueId: "test");
// Act
tagHelper.Process(context, tagHelperOutput);
// Assert
var attribute = Assert.Single(tagHelperOutput.Attributes);
Assert.Equal("href", attribute.Name, StringComparer.Ordinal);
var attributeValue = Assert.IsType<string>(attribute.Value);
Assert.Equal("~/home/index.html", attributeValue, StringComparer.Ordinal);
}
/// <inheritdoc />
public override async Task ProcessAsync(TagHelperContext context, TagHelperOutput output)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
if (output == null)
{
throw new ArgumentNullException(nameof(output));
}
await output.GetChildContentAsync();
var formContext = ViewContext.FormContext;
if (formContext.HasEndOfFormContent)
{
// Perf: Avoid allocating enumerator
for (var i = 0; i < formContext.EndOfFormContent.Count; i++)
{
output.PostContent.AppendHtml(formContext.EndOfFormContent[i]);
}
}
// Reset the FormContext
ViewContext.FormContext = new FormContext();
}
/// <inheritdoc />
/// <remarks>Does nothing if <see cref="For"/> is <c>null</c>.</remarks>
public override void Process(TagHelperContext context, TagHelperOutput output)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
if (output == null)
{
throw new ArgumentNullException(nameof(output));
}
var tagBuilder = Generator.GenerateTextArea(
ViewContext,
For.ModelExplorer,
For.Name,
rows: 0,
columns: 0,
htmlAttributes: null);
if (tagBuilder != null)
{
// Overwrite current Content to ensure expression result round-trips correctly.
output.Content.SetHtmlContent(tagBuilder.InnerHtml);
output.MergeAttributes(tagBuilder);
}
}
public override void Process(TagHelperContext context, TagHelperOutput output)
{
var builder = new TagBuilder("img");
builder.Attributes["src"] = "/pictures/" + UrlHelperThumbnailExtensions.GetThumbnail(null, Src, Size);
output.MergeAttributes(builder);
}
public override void Process(TagHelperContext context, TagHelperOutput output)
{
//load the content items in the specified section
if (!string.IsNullOrWhiteSpace(Section))
{
//Set Content edit properties on tags when logged in
if (_webSite?.IsAuthenticated(ViewContext.HttpContext.User) == true)
{
output.Attributes.Add("data-miniwebsection", Section);
}
//contextualize the HtmlHelper for the current ViewContext
(_htmlHelper as IViewContextAware)?.Contextualize(ViewContext);
//get out the current ViewPage for the Model.
var view = ViewContext.View as RazorView;
var viewPage = view?.RazorPage as RazorPage<ISitePage>;
output.Content.Clear();
if (viewPage != null)
{
var sectionContent = SectionContent(_htmlHelper, viewPage.Model, Section);
output.Content.AppendHtml(sectionContent);
}
}
}
public override void Process(TagHelperContext context, TagHelperOutput output)
{
output.TagName = "div";
output.PreContent.SetHtmlContent("<ul class=\"pagination pagination-lg\">");
var items = new StringBuilder();
for (var i = 1; i <= TotalPages; i++)
{
var li = new TagBuilder("li");
if (i == CurrentPage)
{
li.AddCssClass("active");
}
var a = new TagBuilder("a");
a.MergeAttribute("href", $"{Url}?page={i}&{AdditionalParameters}");
a.MergeAttribute("title", $"Click to go to page {i}");
a.InnerHtml.AppendHtml(i.ToString());
li.InnerHtml.AppendHtml(a);
var writer = new System.IO.StringWriter();
li.WriteTo(writer, HtmlEncoder.Default);
var s = writer.ToString();
items.AppendLine(s);
}
output.Content.SetHtmlContent(items.ToString());
output.PostContent.SetHtmlContent("</ul>");
output.Attributes.Clear();
output.Attributes.Add("class", "pager");
}
public override void Process(TagHelperContext context, TagHelperOutput output)
{
StringBuilder sb = new StringBuilder();
var urlHelper = _UrlHelper.GetUrlHelper(ViewContext);
string menuUrl = urlHelper.Action(ActionName, ControllerName);
output.TagName = "li";
var a = new TagBuilder("a");
a.MergeAttribute("href", $"{menuUrl}");
a.MergeAttribute("title", MenuText);
a.InnerHtml.Append(MenuText);
var routeData = ViewContext.RouteData.Values;
var currentController = routeData["controller"];
var currentAction = routeData["action"];
if (String.Equals(ActionName, currentAction as string, StringComparison.OrdinalIgnoreCase)
&& String.Equals(ControllerName, currentController as string, StringComparison.OrdinalIgnoreCase))
{
output.Attributes.Add("class", "active");
}
output.Content.AppendHtml(a);
}
public override void Process(TagHelperContext context, TagHelperOutput output)
{
base.Process(context, output);
System.Text.StringBuilder sb = new System.Text.StringBuilder();
var existAttribute = output.Attributes["class"];
if (existAttribute != null)
{
sb.Append(existAttribute.Value.ToString());
sb.Append(" ");
}
if (this.Condition)
{
if (!string.IsNullOrWhiteSpace(this.TrueClass))
{
sb.Append(this.TrueClass);
}
}
else
{
if (!string.IsNullOrWhiteSpace(this.FalseClass))
{
sb.Append(this.FalseClass);
}
}
if (sb.Length > 0)
{
output.Attributes.SetAttribute("class", sb.ToString());
}
}
/// <summary>
/// Synchronously executes the <see cref="TagHelper" /> with the given <paramref name="context" /> and
/// <paramref name="output" />.
/// </summary>
/// <param name="context">Contains information associated with the current HTML tag.</param>
/// <param name="output">A stateful HTML element used to generate an HTML tag.</param>
public override void Process(TagHelperContext context, TagHelperOutput output)
{
// Get all items
var allItems = (from i in ConditionalClasses
where i.Value
select i.Key).ToList();
// No actions if no items
if (allItems.Count == 0)
{
return;
}
// The original class attribute
var classAttr = output.Attributes["class"];
// If class attribute exists, merge it
// Original value of the class attribute
var originalClass = classAttr?.Value?.ToString();
// append the original class value if not null
if (!string.IsNullOrWhiteSpace(originalClass))
{
allItems.Add(originalClass);
}
// merge to the final class value
var finalClass = string.Join(" ", allItems);
// Replace original value
output.Attributes.SetAttribute("class", finalClass);
}
public override void Process(TagHelperContext context, TagHelperOutput output)
{
if (MakePretty.HasValue && !MakePretty.Value)
{
return;
}
if (output.TagName == null)
{
// Another tag helper e.g. TagHelperviewComponentTagHelper has suppressed the start and end tags.
return;
}
string prettyStyle;
if (PrettyTagStyles.TryGetValue(output.TagName, out prettyStyle))
{
var style = Style ?? string.Empty;
if (!string.IsNullOrEmpty(style))
{
style += ";";
}
output.Attributes.SetAttribute("style", style + prettyStyle);
}
}
public override void Process(TagHelperContext context, TagHelperOutput output)
{
TagBuilder table = new TagBuilder("table");
table.GenerateId(context.UniqueId, "id");
var attributes = context.AllAttributes.Where(a => a.Name != ItemsAttributeName).ToDictionary(a => a.Name);
table.MergeAttributes(attributes);
var tr = new TagBuilder("tr");
var heading = Items.First();
PropertyInfo[] properties = heading.GetType().GetProperties();
foreach (var prop in properties)
{
var th = new TagBuilder("th");
th.InnerHtml.Append(prop.Name);
tr.InnerHtml.AppendHtml(th);
}
table.InnerHtml.AppendHtml(tr);
foreach (var item in Items)
{
tr = new TagBuilder("tr");
foreach (var prop in properties)
{
var td = new TagBuilder("td");
td.InnerHtml.Append(prop.GetValue(item).ToString());
tr.InnerHtml.AppendHtml(td);
}
table.InnerHtml.AppendHtml(tr);
}
output.Content.AppendHtml(table.InnerHtml);
}
public DefaultServerAutocompleteProcessor(TagHelperContext context, TagHelperOutput output, AutocompleteTagHelper tag, AutocompleteOptions options)
{
this.context = context;
this.output = output;
this.tag = tag;
this.options = options;
}
public override void Process(TagHelperContext context, TagHelperOutput output)
{
if (!Condition)
{
output.SuppressOutput();
}
}
public override async Task ProcessAsync(TagHelperContext context, TagHelperOutput output)
{
var urlHelper = urlHelperFactory.GetUrlHelper(ViewContext);
await Task.Run(() =>
{
output.TagMode = TagMode.SelfClosing;
output.TagName = null;
var speaker = speakerRepository.All.FirstOrDefault(_ => _.Name == Name);
if (speaker == null)
{
output.Content.SetHtmlContent($"<label>{Name}</label>");
}
else
{
output.Content.SetHtmlContent($"<a href=\"{urlHelper.Link("SpeakerDetails", new { name = Name })}\">{Name}</a>");
}
});
}
public override void Process(TagHelperContext context, TagHelperOutput output)
{
output.TagName = null;
ConditionalCommentType type = CommentType;
string ifCommentStartPart;
string ifCommentEndPart;
switch (type)
{
case ConditionalCommentType.Hidden:
ifCommentStartPart = "<!--[if ";
ifCommentEndPart = "]>";
break;
case ConditionalCommentType.RevealedValidating:
ifCommentStartPart = "<!--[if ";
ifCommentEndPart = "]><!-->";
break;
case ConditionalCommentType.RevealedValidatingSimplified:
ifCommentStartPart = "<!--[if ";
ifCommentEndPart = "]>-->";
break;
case ConditionalCommentType.Revealed:
ifCommentStartPart = "<![if ";
ifCommentEndPart = "]>";
break;
default:
throw new NotSupportedException();
}
TagHelperContent preContent = output.PreContent;
preContent.AppendHtml(ifCommentStartPart);
preContent.AppendHtml(Expression);
preContent.AppendHtml(ifCommentEndPart);
string endIfComment;
switch (type)
{
case ConditionalCommentType.Hidden:
endIfComment = "<![endif]-->";
break;
case ConditionalCommentType.RevealedValidating:
case ConditionalCommentType.RevealedValidatingSimplified:
endIfComment = "<!--<![endif]-->";
break;
case ConditionalCommentType.Revealed:
endIfComment = "<![endif]>";
break;
default:
throw new NotSupportedException();
}
output.PostContent.AppendHtml(endIfComment);
}
public override void Process(TagHelperContext context, TagHelperOutput output)
{
output.TagName = "a"; // Replaces <email> with <a> tag
var address = MailTo + "@" + EmailDomain;
output.Attributes.SetAttribute("href", "mailto:" + address);
output.Content.SetContent(address);
}
public override void Process(TagHelperContext context, TagHelperOutput output)
{
output.TagName = "textarea";
output.AppendClass("form-control");
base.Process(context, output);
}
public override void Process(TagHelperContext context, TagHelperOutput output)
{
JsTree tree = For.Model as JsTree;
output.Attributes.SetAttribute("class", (output.Attributes["class"]?.Value + " js-tree").Trim());
output.Content.AppendHtml(HiddenIdsFor(tree));
output.Content.AppendHtml(JsTreeFor(tree));
}
public override async Task ProcessAsync(TagHelpers.TagHelperContext context, TagHelpers.TagHelperOutput output)
{
var content = await output.GetChildContentAsync();
output.TagName = "svg";
output.Attributes.Add("xmlns", svgNamespace);
if (content.IsEmptyOrWhiteSpace)
{
output.Content.SetHtmlContent(Octicons.Instance.SpriteSheet);
}
}
public override void Process(TagHelpers.TagHelperContext context, TagHelpers.TagHelperOutput output)
{
var name = Octicons.SymbolName(Symbol);
var octicon = _octicons.Symbol(Symbol);
//var symbolStartTag = $"<symbol viewBox=\"0 0 {octicon.Width} {octicon.Height}\" id=\"{name}\">";
//var symbolEndTag = "</symbol>";
output.TagName = "symbol";
output.Attributes.Add("id", name);
output.Attributes.Add("viewBox", $"0 0 {octicon.Width} {octicon.Height}");
output.Content.SetHtmlContent(octicon.Path);
}
private string Classes(TagHelpers.TagHelperContext context)
{
var symbolName = Octicons.SymbolName(Symbol);
var classes = $"octicon octicon-{symbolName}";
TagHelpers.TagHelperAttribute classAttribute;
bool foundClass = context.AllAttributes.TryGetAttribute("class", out classAttribute);
if (foundClass)
{
classes = $"{classes} {classAttribute.Value}";
}
return(classes);
}
public override void Process(TagHelpers.TagHelperContext context, TagHelpers.TagHelperOutput output)
{
var useSpriteAttribute = new TagHelpers.TagHelperAttribute(UseSpriteAttributeName);
bool useSprite = context.AllAttributes.Contains(useSpriteAttribute);
var octicon = _octicons.Symbol(Symbol);
CalculateSize(octicon);
output.TagName = "svg";
output.Attributes.Remove(useSpriteAttribute);
output.Attributes.Add("viewBox", ViewBox());
output.Attributes.Add("width", Width.ToString());
output.Attributes.Add("height", Height.ToString());
output.Attributes.Add("version", Version);
output.Attributes.SetAttribute("class", Classes(context));
output.Content.SetHtmlContent(Svg(useSprite));
}
public virtual void Init(TagHelperContext context)
{
}
