I couldn’t find a similar solution online as I believe there is an emerging pattern where we are now instructing clients to drag EPiServer Blocks into Rich Text editors.
Requirement:
As an Editor I want to limit certain blocks types from being dragged into the rich text editor
Solution #1:
Apply this attribute to any of your xhtml properties to enable to validation functionality
[Display(Name = "Text", GroupName = SystemTabNames.Content)]
[XHtmlStringAllowedBlockTypes(new[] { typeof(TextBlock), typeof(ImageBlock) })]
public virtual XhtmlString RichText { get; set; }
Implement the following attribute where your other validation attributes reside.
public class XHtmlStringAllowedBlockTypes : ValidationAttribute
{
private readonly Type[] allowedTypes;
public XHtmlStringAllowedBlockTypes(Type[] allowedTypes)
{
this.allowedTypes = allowedTypes;
}
protected override ValidationResult IsValid(object value, ValidationContext context)
{
var contentData = context.ObjectInstance as IContentData;
if (contentData != null && contentData.Property[context.MemberName].Value is XhtmlString)
{
var richTextProperty = (XhtmlString)contentData.Property[context.MemberName].Value;
foreach (ContentFragment fragment in richTextProperty.Fragments.Where(x => x is ContentFragment))
{
var content = ServiceLocator.Current.GetInstance<IContentRepository>().Get<IContentData>(fragment.ContentLink);
foreach (var allowedType in allowedTypes)
{
if (allowedType.IsInstanceOfType(content))
{
return new ValidationResult(string.Format("You cannot add {0} to {1}", content.GetType(), context.MemberName));
}
}
}
}
return ValidationResult.Success;
}
}
References:
http://world.episerver.com/documentation/Items/Developers-Guide/Episerver-CMS/9/Content/Validation/
