/// <summary>
/// 从元素标签中获取路由的虚拟路径
/// </summary>
/// <param name="element">要获取分析路由虚拟路径的元素</param>
/// <param name="clearRouteAttributes">是否清理路由属性设置</param>
/// <returns>获取的虚拟路径</returns>
internal string GetRouteUrl(IHtmlElement element, bool clearRouteAttributes)
{
if (element == null)
{
throw new ArgumentNullException("element");
}
if (element.Attribute("action") == null)
{
throw new InvalidOperationException();
}
var action = element.Attribute("action").Value() ?? RouteData.Values["action"].CastTo <string>();
var controller = element.Attribute("controller").Value() ?? RouteData.Values["controller"].CastTo <string>();
var routeValues = GetRouteValues(element, clearRouteAttributes);
if (clearRouteAttributes)
{
element.RemoveAttribute("action");
element.RemoveAttribute("controller");
element.RemoveAttribute("inherits");
}
return(Url.Action(action, controller, routeValues));
}
/// <summary>
/// 派生类重写此方法对拥有 Action URL 的元素进行处理
/// </summary>
/// <param name="element">要处理的元素</param>
/// <returns>元素是否包含 Action URL 并已经进行处理。</returns>
protected virtual bool ProcessActionLink(IHtmlElement element)
{
if (element.Attribute("action") == null)
{
return(false);
}
string attributeName;
if (element.Name.EqualsIgnoreCase("a"))
{
attributeName = "href";
}
else if (element.Name.EqualsIgnoreCase("img") || element.Name.EqualsIgnoreCase("script"))
{
attributeName = "src";
}
else if (element.Name.EqualsIgnoreCase("form") && element.Attribute("controller") != null)
{
attributeName = "action";
}
else
{
return(false);
}
var action = element.Attribute("action").Value() ?? RouteData.Values["action"].CastTo <string>();
var controller = element.Attribute("controller").Value() ?? RouteData.Values["controller"].CastTo <string>();
var routeValues = UrlHelper.GetRouteValues(element);
element.RemoveAttribute("action");
element.RemoveAttribute("controller");
element.RemoveAttribute("inherits");
var url = UrlHelper.Action(action, controller, routeValues);
if (url == null)
{
element.Attribute(attributeName).Remove();
}
else
{
element.SetAttribute(attributeName, url);
}
return(true);
}
/// <summary>
/// 更新 class 属性
/// </summary>
private void UpdateClass()
{
if (_classes.Any())
{
_element.SetAttribute("class", _rawValue = string.Join(" ", _classes.ToArray()));
}
else
{
_element.RemoveAttribute("class");
}
}
/// <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);
}
/// <summary>
/// 尝试获取数据模型
/// </summary>
/// <param name="element">当前正在处理的元素</param>
/// <param name="dataModel">获取到的数据模型</param>
/// <returns>是否成功获取数据模型</returns>
protected virtual bool TryGetDataModel(IHtmlElement element, out object dataModel)
{
dataModel = null;
var expression = BindingExpression.ParseExpression(element.Attribute("datamodel").Value());
if (expression == null)//若datamodel属性不是一个合法的数据绑定表达式，则忽略之。
{
return(false);
}
element.RemoveAttribute("datamodel");//成功取得dataModel后，应删除该属性。
if (!TryGetValue(expression, out dataModel))
{
throw new InvalidOperationException("处理元素数据上下文绑定时出现错误，绑定表达式不支持获取数据对象");
}
//此处不检测dataContext是否等于当前dataContext的原因是，如果元素中写下datacontext属性并指向当前datacontext，表示需要在此处重新创建一个绑定上下文。
return(true);
}
/// <summary>
/// Sanitizes the style.
/// </summary>
/// <param name="element">The element.</param>
/// <param name="baseUrl">The base URL.</param>
protected void SanitizeStyle(IHtmlElement element, string baseUrl)
{
// filter out invalid CSS declarations
// see https://github.com/AngleSharp/AngleSharp/issues/101
if (element.GetAttribute("style") == null)
{
return;
}
if (element.Style == null)
{
element.RemoveAttribute("style");
return;
}
element.SetAttribute("style", element.Style.ToCss());
var styles = element.Style;
if (styles == null || styles.Length == 0)
{
return;
}
SanitizeStyleDeclaration(element, styles, baseUrl);
}
/// <summary>
/// 派生类重写此方法对拥有 Action URL 的元素进行处理
/// </summary>
/// <param name="element">要处理的元素</param>
/// <returns>元素是否包含 Action URL 并已经进行处理。</returns>
protected virtual bool ProcessActionLink( IHtmlElement element )
{
if ( element.Attribute( "action" ) == null )
return false;
string attributeName;
if ( element.Name.EqualsIgnoreCase( "a" ) )
attributeName = "href";
else if ( element.Name.EqualsIgnoreCase( "img" ) || element.Name.EqualsIgnoreCase( "script" ) )
attributeName = "src";
else if ( element.Name.EqualsIgnoreCase( "form" ) && element.Attribute( "controller" ) != null )
attributeName = "action";
else
return false;
var action = element.Attribute( "action" ).Value() ?? RouteData.Values["action"].CastTo<string>();
var controller = element.Attribute( "controller" ).Value() ?? RouteData.Values["controller"].CastTo<string>();
var routeValues = UrlHelper.GetRouteValues( element );
element.RemoveAttribute( "action" );
element.RemoveAttribute( "controller" );
element.RemoveAttribute( "inherits" );
var url = UrlHelper.Action( action, controller, routeValues );
if ( url == null )
element.Attribute( attributeName ).Remove();
else
element.SetAttribute( attributeName, url );
return true;
}
/// <summary>
/// 从元素标签中获取路由的虚拟路径
/// </summary>
/// <param name="element">要获取分析路由虚拟路径的元素</param>
/// <param name="clearRouteAttributes">是否清理路由属性设置</param>
/// <returns>获取的虚拟路径</returns>
internal string GetRouteUrl( IHtmlElement element, bool clearRouteAttributes )
{
if ( element == null )
throw new ArgumentNullException( "element" );
if ( element.Attribute( "action" ) == null )
throw new InvalidOperationException();
var action = element.Attribute( "action" ).Value() ?? RouteData.Values["action"].CastTo<string>();
var controller = element.Attribute( "controller" ).Value() ?? RouteData.Values["controller"].CastTo<string>();
var routeValues = GetRouteValues( element, clearRouteAttributes );
if ( clearRouteAttributes )
{
element.RemoveAttribute( "action" );
element.RemoveAttribute( "controller" );
element.RemoveAttribute( "inherits" );
}
return Url.Action( action, controller, routeValues );
}
/// <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">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);
}
