/// <summary>
/// 对元素属性进行绑定操作
/// </summary>
/// <param name="attribute">要绑定的元素属性</param>
/// <param name="context">绑定上下文</param>
/// <returns>是否成功绑定</returns>
public bool BindAttribute(IHtmlAttribute attribute, HtmlBindingContext context)
{
if (attribute.Name == "datacontext")
{
return(false);
}
var expression = AttributeExpression.ParseExpression(attribute);
if (expression == null || !expression.Name.EqualsIgnoreCase("Binding"))
{
return(false);
}
var dataObject = GetDataObject(expression, context);
if (dataObject == null)
{
attribute.Remove();
return(true);
}
string value = GetBindingValue(expression, dataObject);
attribute.SetValue(value);
return(true);
}
private static object GetDataObject(AttributeExpression expression, HtmlBindingContext context)
{
//获取绑定数据源
string key;
object dataObject;
if (expression.Arguments.TryGetValue("key", out key) || expression.Arguments.TryGetValue("name", out key))
{
context.Data.TryGetValue(key, out dataObject);
}
else
{
dataObject = context.DataContext;
}
if (dataObject == null)
{
return(null);
}
string path;
if (expression.Arguments.TryGetValue("path", out path))
{
dataObject = DataBinder.Eval(dataObject, path);
}
return(dataObject);
}
private static string GetBindingValue(AttributeExpression expression, object dataObject)
{
{
string format;
if (expression.Arguments.TryGetValue("format", out format))
{
var formattable = dataObject as IFormattable;
if (formattable != null)
{
return(((IFormattable)dataObject).ToString(format, CultureInfo.InvariantCulture));
}
}
}
{
string value;
if (expression.Arguments.TryGetValue("value", out value))
{
if (Convert.ToBoolean(dataObject))
{
return(value);
}
else if (expression.Arguments.TryGetValue("alternativeValue", out value))
{
return(value);
}
else
{
return(null);
}
}
}
return(dataObject.ToString());
}
/// <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;
}
private static object GetDataObject( AttributeExpression expression, HtmlBindingContext context )
{
//获取绑定数据源
string key;
object dataObject;
if ( expression.Arguments.TryGetValue( "key", out key ) || expression.Arguments.TryGetValue( "name", out key ) )
context.Data.TryGetValue( key, out dataObject );
else
dataObject = context.DataContext;
if ( dataObject == null )
return null;
string path;
if ( expression.Arguments.TryGetValue( "path", out path ) )
dataObject = DataBinder.Eval( dataObject, path );
return dataObject;
}
private static string GetBindingValue( AttributeExpression expression, object dataObject )
{
{
string format;
if ( expression.Arguments.TryGetValue( "format", out format ) )
{
var formattable = dataObject as IFormattable;
if ( formattable != null )
return ((IFormattable) dataObject).ToString( format, CultureInfo.InvariantCulture );
}
}
{
string value;
if ( expression.Arguments.TryGetValue( "value", out value ) )
{
if ( Convert.ToBoolean( dataObject ) )
return value;
else if ( expression.Arguments.TryGetValue( "alternativeValue", out value ) )
return value;
else
return null;
}
}
return dataObject.ToString();
}
/// <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);
}
