/// <summary>
/// 尝试生成元素开始标签的HTML形式
/// </summary>
/// <param name="element">要生成HTML的元素</param>
/// <param name="selfClosed">指示是否应产生自结束符号</param>
/// <returns></returns>
public static string GenerateTagHtml( IHtmlElement element, bool selfClosed )
{
if ( element == null )
throw new ArgumentNullException( "element" );
var builder = new StringBuilder( 20 );
builder.Append( "<" );
builder.Append( element.Name );
foreach ( var attribute in element.Attributes() )
{
builder.Append( " " );
builder.Append( attribute.Name );
if ( attribute.AttributeValue != null )
{
var specification = element.Document.HtmlSpecification;
if ( ( specification.IsUriValue( attribute ) || specification.IsScriptValue( attribute ) ) && !attribute.AttributeValue.Contains( '"' ) )
builder.Append( "=\"" ).Append( attribute.AttributeValue ).Append( "\"" );
else
builder.Append( "=\"" ).Append( HtmlEncoding.HtmlAttributeEncode( attribute.AttributeValue ) ).Append( "\"" );
}
}
if ( selfClosed )
builder.Append( " /" );
builder.Append( ">" );
return builder.ToString();
}
/// <summary>
/// 获取指定名称的属性对象
/// </summary>
/// <param name="element">元素</param>
/// <param name="name">属性名</param>
/// <returns>属性对象，如果没找到，则返回null</returns>
/// <remarks>
/// 如果有多个同名的属性，此方法将报错。
/// </remarks>
public static IHtmlAttribute Attribute(this IHtmlElement element, string name)
{
if (element == null)
{
throw new ArgumentNullException("element");
}
var attributes = element.Attributes();
/*
* //即使按字典检索，由于大部分元素属性都很少，也不见得有性能提升
* var dictionary = attributes as IDictionary<string, IHtmlAttribute>;
*
* if ( dictionary != null )
* return dictionary[name];
*/
var attributeCollection = attributes as IHtmlAttributeCollection;
if (attributeCollection != null)
{
return(attributeCollection.Get(name));
}
return(attributes.SingleOrDefault(a => a.Name.EqualsIgnoreCase(name)));
}
/// <summary>
/// 添加元素的副本
/// </summary>
/// <param name="container">要添加副本的容器</param>
/// <param name="index">要添加的位置</param>
/// <param name="element">要创作副本的元素</param>
/// <returns>添加后的元素</returns>
public static IHtmlElement AddCopy(this IHtmlContainer container, int index, IHtmlElement element)
{
if (container == null)
{
throw new ArgumentNullException("container");
}
if (element == null)
{
throw new ArgumentNullException("element");
}
var _element = container.AddElement(index, element.Name);
foreach (var attribute in element.Attributes())
{
_element.AddAttribute(attribute.Name, attribute.AttributeValue);
}
foreach (var node in element.Nodes())
{
AddCopy(_element, node);
}
return(_element);
}
/// <summary>
/// 从元素标签中获取所有的路由值
/// </summary>
/// <param name="element">要获取分析路由值的元素</param>
/// <returns>获取的路由值</returns>
protected RouteValueDictionary GetRouteValues(IHtmlElement element)
{
var routeValues = new RouteValueDictionary();
var inherits = element.Attribute("inherits").Value();
if (inherits != null)
{
var inheritsKeys = GetInheritsKeys(inherits).Distinct(StringComparer.OrdinalIgnoreCase);
foreach (var key in inheritsKeys)
{
routeValues.Add(key, RouteData.Values[key]);
}
}
foreach (var attribute in element.Attributes().Where(a => a.Name.StartsWith("_")).ToArray())
{
var key = attribute.Name.Substring(1);
var value = attribute.Value() ?? RouteData.Values[key];
routeValues.Remove(key);
routeValues.Add(key, value);
attribute.Remove();
}
return(routeValues);
}
/// <summary>
/// 对元素进行数据绑定
/// </summary>
/// <param name="element">要绑定数据的元素</param>
private void BindElement(IHtmlElement element)
{
element.Attributes().ToArray().ForAll(a => BindAttribute(a));
object dataContext = null;
Binders.FirstOrDefault(b => b.BindElement(element, this, out dataContext));
if (dataContext != null)
{
_bindingDataContexts.Push(new BindingDataContext {
DataContext = dataContext, Scope = element
});
var listData = dataContext as IEnumerable;
if (listData != null && IsListItem(element))
{
BindElementList(element, listData.Cast <object>().ToArray());
}
else
{
BindChilds(element);
}
_bindingDataContexts.Pop();
}
else
{
BindChilds(element);
}
}
/// <summary>
/// 对元素进行数据绑定
/// </summary>
/// <param name="element">需要绑定数据的元素</param>
/// <param name="context">绑定上下文</param>
/// <returns>返回是否对元素进行了不可逆转的操作（例如移除），故而禁止后续的绑定操作</returns>
public void BindElement( HtmlBindingContext context, IHtmlElement element )
{
if ( element.Attribute( "binding-visible" ) != null )
{
var visible = element.Attribute( "binding-visible" ).Value();
if ( visible.EqualsIgnoreCase( "false" ) || visible.EqualsIgnoreCase( "hidden" ) || visible.EqualsIgnoreCase( "invisible" ) )
{
element.Remove();
context.CancelChildsBinding = context.BindCompleted = true;
}
}
{
//处理样式类
var classAttribute = element.Attribute( classAttributePrefix );
if ( classAttribute != null )
{
if ( !string.IsNullOrWhiteSpace( classAttribute.AttributeValue ) )
{
var classes = Regulars.whiteSpaceSeparatorRegex.Split( classAttribute.AttributeValue ).Where( c => c != "" ).ToArray();
if ( classes.Any() )
element.Class( classes );
}
element.RemoveAttribute( classAttributePrefix );
}
}
{
var classAttributes = element.Attributes().Where( a => a.Name.StartsWith( classAttributePrefix ) ).ToArray();
BindElementClasses( element, classAttributes );
}
//处理CSS样式
var styleAttributes = element.Attributes().Where( a => a.Name.StartsWith( styleAttributePrefix ) ).ToArray();
BindElementStyles( element, styleAttributes );
}
/// <summary>
/// 对元素进行数据绑定
/// </summary>
/// <param name="element">需要绑定数据的元素</param>
/// <param name="context">绑定上下文</param>
/// <returns>返回是否对元素进行了不可逆转的操作（例如移除），故而禁止后续的绑定操作</returns>
public void BindElement(HtmlBindingContext context, IHtmlElement element)
{
if (element.Attribute("binding-visible") != null)
{
var visible = element.Attribute("binding-visible").Value();
if (visible.EqualsIgnoreCase("false") || visible.EqualsIgnoreCase("hidden") || visible.EqualsIgnoreCase("invisible"))
{
element.Remove();
context.CancelChildsBinding = context.BindCompleted = true;
}
}
{
//处理样式类
var classAttribute = element.Attribute(classAttributePrefix);
if (classAttribute != null)
{
if (!string.IsNullOrWhiteSpace(classAttribute.AttributeValue))
{
var classes = Regulars.whiteSpaceSeparatorRegex.Split(classAttribute.AttributeValue).Where(c => c != "").ToArray();
if (classes.Any())
{
element.Class(classes);
}
}
element.RemoveAttribute(classAttributePrefix);
}
}
{
var classAttributes = element.Attributes().Where(a => a.Name.StartsWith(classAttributePrefix)).ToArray();
BindElementClasses(element, classAttributes);
}
//处理CSS样式
var styleAttributes = element.Attributes().Where(a => a.Name.StartsWith(styleAttributePrefix)).ToArray();
BindElementStyles(element, styleAttributes);
}
public IEnumerable <IBinding> CreateBindings(BindingManager manager, IHtmlElement element)
{
if (element.Name.EqualsIgnoreCase("binding"))
{
return(new[] { CreateElementBinding(element) });
}
else
{
return(element.Attributes().Select(a => CreateAttributeBinding(a)).NotNull());
}
}
public IEnumerable<IBinding> CreateBindings( BindingManager manager, IHtmlElement element )
{
if ( element.Name.EqualsIgnoreCase( "binding" ) )
{
return new[] { CreateElementBinding( element ) };
}
else
{
return element.Attributes().Select( a => CreateAttributeBinding( a ) ).NotNull();
}
}
/// <summary>
/// 实现 BindElement 方法对元素的 URL 属性进行处理
/// </summary>
/// <param name="context">当前绑定上下文</param>
/// <param name="element">当前元素上下文</param>
public void BindElement(HtmlBindingContext context, IHtmlElement element)
{
if (ProcessActionLink(element))//对元素进行 Action URL 处理，若处理成功，则跳过元素。
{
return;
}
element.Attributes().ToArray()
.Where(attribute => Specification.IsUriValue(attribute))
.ForAll(attribute => UrlHelper.ResolveUri(attribute, DocumentPath));
}
/// <summary>
/// 对元素进行数据绑定
/// </summary>
/// <param name="element">要绑定数据的元素</param>
public virtual void DataBind(IHtmlElement element)
{
var attributes = element.Attributes().ToArray();
attributes.ForAll(a => BindAttribute(a));
if (BindExpressionElement(element))
{
return;
}
BindElement(element);
}
private void CustomRouteValues(IHtmlElement element, string prefix, RouteValueDictionary routeValues, bool clearRouteAttributes)
{
foreach (var attribute in element.Attributes().Where(a => a.Name.StartsWith(prefix)).ToArray())
{
var key = attribute.Name.Substring(prefix.Length);
var value = attribute.Value() ?? RouteData.Values[key];
routeValues.Remove(key);
routeValues.Add(key, value);
if (clearRouteAttributes)
{
attribute.Remove();
}
}
}
/// <summary>
/// 尝试生成元素开始标签的HTML形式
/// </summary>
/// <param name="element">要生成HTML的元素</param>
/// <param name="selfClosed">指示是否应产生自结束符号</param>
/// <returns></returns>
public static string GenerateTagHtml(IHtmlElement element, bool selfClosed)
{
if (element == null)
{
throw new ArgumentNullException("element");
}
var builder = new StringBuilder(20);
builder.Append("<");
builder.Append(element.Name);
foreach (var attribute in element.Attributes())
{
builder.Append(" ");
builder.Append(attribute.Name);
if (attribute.AttributeValue != null)
{
var specification = element.Document.HtmlSpecification;
if ((specification.IsUriValue(attribute) || specification.IsScriptValue(attribute)) && !attribute.AttributeValue.Contains('"'))
{
builder.Append("=\"").Append(attribute.AttributeValue).Append("\"");
}
else
{
builder.Append("=\"").Append(HtmlEncoding.HtmlAttributeEncode(attribute.AttributeValue)).Append("\"");
}
}
}
if (selfClosed)
{
builder.Append(" /");
}
builder.Append(">");
return(builder.ToString());
}
/// <summary>
/// 创建元素的副本
/// </summary>
/// <param name="factory">用于创建元素的构建器</param>
/// <param name="element">需要被创建副本的元素</param>
/// <returns>元素的未分配副本</returns>
public static IFreeElement MakeCopy(this IHtmlNodeFactory factory, IHtmlElement element)
{
if (factory == null)
{
throw new ArgumentNullException("factory");
}
if (element == null)
{
throw new ArgumentNullException("element");
}
var free = factory.CreateElement(element.Name);
foreach (var attribute in element.Attributes())
{
free.AddAttribute(attribute.Name, attribute.Value());
}
CopyChildNodes(element, free);
return(free);
}
private void CustomRouteValues( IHtmlElement element, string prefix, RouteValueDictionary routeValues, bool clearRouteAttributes )
{
foreach ( var attribute in element.Attributes().Where( a => a.Name.StartsWith( prefix ) ).ToArray() )
{
var key = attribute.Name.Substring( prefix.Length );
var value = attribute.Value() ?? RouteData.Values[key];
routeValues.Remove( key );
routeValues.Add( key, value );
if ( clearRouteAttributes )
attribute.Remove();
}
}
/// <summary>
/// 对元素进行数据绑定
/// </summary>
/// <param name="element">需要绑定数据的元素</param>
/// <param name="context">绑定上下文</param>
/// <param name="dataContext">数据上下文</param>
/// <returns>是否进行了绑定</returns>
public bool BindElement( IHtmlElement element, HtmlBindingContext context, out object dataContext )
{
dataContext = null;
if ( element.Attribute( "binding-visible" ) != null )
{
var visible = element.Attribute( "binding-visible" ).Value();
if ( visible.EqualsIgnoreCase( "false" ) || visible.EqualsIgnoreCase( "hidden" ) || visible.EqualsIgnoreCase( "invisible" ) )
element.Remove();
return true;
}
//处理样式类
{
var classAttribute = element.Attribute( classAttributeName );
if ( classAttribute != null )
{
if ( !string.IsNullOrWhiteSpace( classAttribute.AttributeValue ) )
{
var classes = Regulars.whiteSpaceSeparatorRegex.Split( classAttribute.AttributeValue ).Where( c => c != "" ).ToArray();
if ( classes.Any() )
element.Class( classes );
}
element.RemoveAttribute( classAttributeName );
}
}
//处理CSS样式
var styleAttributes = element.Attributes().Where( a => a.Name.StartsWith( styleAttributePrefix ) ).ToArray();
if ( styleAttributes.Any() )
BindElementStyles( element, styleAttributes );
if ( !element.Name.EqualsIgnoreCase( "view" ) && !element.Name.EqualsIgnoreCase( "binding" ) )
{
var dataContextExpression = AttributeExpression.ParseExpression( element.Attribute( "datacontext" ) );
if ( dataContextExpression != null )
dataContext = GetDataObject( dataContextExpression, context );
return false;
}
var expression = new AttributeExpression( element );
object dataObject = GetDataObject( expression, context );
if ( dataObject == null )
return false;
var format = element.Attribute( "format" ).Value();
//绑定到客户端脚本对象
var variableName = element.Attribute( "var" ).Value() ?? element.Attribute( "variable" ).Value();
if ( variableName != null )
{
if ( format != null )
dataObject = string.Format( format, dataObject );
var hostName = element.Attribute( "host" ).Value();
var script = (string) null;
if ( hostName == null )
script = string.Format( "(function(){{ this['{0}'] = {1} }})();", variableName, ToJson( dataObject ) );
else
script = string.Format( "(function(){{ this['{0}'] = {1} }})();", variableName, ToJson( dataObject ) );
element.ReplaceWith( string.Format( "<script type=\"text/javascript\">{0}</script>", script ) );
return true;
}
//绑定为 HTML 文本
var bindValue = string.Format( format ?? "{0}", dataObject );
var attributeName = element.Attribute( "attribute" ).Value() ?? element.Attribute( "attr" ).Value();
if ( attributeName != null )
{
var nextElement = element.NextElement();
if ( nextElement == null )
return false;
nextElement.SetAttribute( attributeName, bindValue );
return true;
}
element.ReplaceWith( bindValue );
return true;
}
/// <summary>
/// 从元素创建属性表达式
/// </summary>
/// <param name="element">要创建属性表达式的元素</param>
public AttributeExpression(IHtmlElement element) : this(element.Name, element.Attributes().ToDictionary(a => a.Name, a => a.AttributeValue, StringComparer.OrdinalIgnoreCase))
{
}
/// <summary>
/// 从元素创建属性表达式
/// </summary>
/// <param name="element">要创建属性表达式的元素</param>
public AttributeExpression( IHtmlElement element )
: this(element.Name, element.Attributes().ToDictionary( a => a.Name, a => a.AttributeValue, StringComparer.OrdinalIgnoreCase ))
{
}
private IBinding CreateElementBinding( IHtmlElement element )
{
return new Binding( element, element.Attributes().ToDictionary( a => a.Name, a => a.AttributeValue ) );
}
/// <summary>
/// 实现 BindElement 方法对元素的 URL 属性进行处理
/// </summary>
/// <param name="context">当前绑定上下文</param>
/// <param name="element">当前元素上下文</param>
public void BindElement( HtmlBindingContext context, IHtmlElement element )
{
if ( ProcessActionLink( element ) )//对元素进行 Action URL 处理，若处理成功，则跳过元素。
return;
element.Attributes().ToArray()
.Where( attribute => Specification.IsUriValue( attribute ) )
.ForAll( attribute => UrlHelper.ResolveUri( attribute, DocumentPath ) );
}
private IBinding CreateElementBinding(IHtmlElement element)
{
return(new Binding(element, element.Attributes().ToDictionary(a => a.Name, a => a.AttributeValue)));
}
/// <summary>
/// 对元素进行数据绑定
/// </summary>
/// <param name="element">需要绑定数据的元素</param>
/// <param name="context">绑定上下文</param>
/// <param name="dataContext">数据上下文</param>
/// <returns>是否进行了绑定</returns>
public bool BindElement(IHtmlElement element, HtmlBindingContext context, out object dataContext)
{
dataContext = null;
if (element.Attribute("binding-visible") != null)
{
var visible = element.Attribute("binding-visible").Value();
if (visible.EqualsIgnoreCase("false") || visible.EqualsIgnoreCase("hidden") || visible.EqualsIgnoreCase("invisible"))
{
element.Remove();
}
return(true);
}
//处理样式类
{
var classAttribute = element.Attribute(classAttributeName);
if (classAttribute != null)
{
if (!string.IsNullOrWhiteSpace(classAttribute.AttributeValue))
{
var classes = Regulars.whiteSpaceSeparatorRegex.Split(classAttribute.AttributeValue).Where(c => c != "").ToArray();
if (classes.Any())
{
element.Class(classes);
}
}
element.RemoveAttribute(classAttributeName);
}
}
//处理CSS样式
var styleAttributes = element.Attributes().Where(a => a.Name.StartsWith(styleAttributePrefix)).ToArray();
if (styleAttributes.Any())
{
BindElementStyles(element, styleAttributes);
}
if (!element.Name.EqualsIgnoreCase("view") && !element.Name.EqualsIgnoreCase("binding"))
{
var dataContextExpression = AttributeExpression.ParseExpression(element.Attribute("datacontext"));
if (dataContextExpression != null)
{
dataContext = GetDataObject(dataContextExpression, context);
}
return(false);
}
var expression = new AttributeExpression(element);
object dataObject = GetDataObject(expression, context);
if (dataObject == null)
{
return(false);
}
var format = element.Attribute("format").Value();
//绑定到客户端脚本对象
var variableName = element.Attribute("var").Value() ?? element.Attribute("variable").Value();
if (variableName != null)
{
if (format != null)
{
dataObject = string.Format(format, dataObject);
}
var hostName = element.Attribute("host").Value();
var script = (string)null;
if (hostName == null)
{
script = string.Format("(function(){{ this['{0}'] = {1} }})();", variableName, ToJson(dataObject));
}
else
{
script = string.Format("(function(){{ this['{0}'] = {1} }})();", variableName, ToJson(dataObject));
}
element.ReplaceWith(string.Format("<script type=\"text/javascript\">{0}</script>", script));
return(true);
}
//绑定为 HTML 文本
var bindValue = string.Format(format ?? "{0}", dataObject);
var attributeName = element.Attribute("attribute").Value() ?? element.Attribute("attr").Value();
if (attributeName != null)
{
var nextElement = element.NextElement();
if (nextElement == null)
{
return(false);
}
nextElement.SetAttribute(attributeName, bindValue);
return(true);
}
element.ReplaceWith(bindValue);
return(true);
}
/// <summary>
/// 对元素进行数据绑定
/// </summary>
/// <param name="element">要绑定数据的元素</param>
private void BindElement( IHtmlElement element )
{
element.Attributes().ToArray().ForAll( a => BindAttribute( a ) );
object dataContext = null;
Binders.FirstOrDefault( b => b.BindElement( element, this, out dataContext ) );
if ( dataContext != null )
{
_bindingDataContexts.Push( new BindingDataContext { DataContext = dataContext, Scope = element } );
var listData = dataContext as IEnumerable;
if ( listData != null && IsListItem( element ) )
BindElementList( element, listData.Cast<object>().ToArray() );
else
BindChilds( element );
_bindingDataContexts.Pop();
}
else
BindChilds( element );
}
