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How to limit word count in XhtmlString property which displays in TinyMCE editor?


How to limit word count in XhtmlString property which displays in TinyMCE editor?

Jul 03, 2019 5:16

Hi Muller,

I think you are mention about XhtmlString validator, isn't it?

If yes, then I would suggest you:

  1. Create new custom plugin for TinyMCE to inject your js code like this (of course we shouldn't need to listen submit event, we can handle change event of TinyMCE):
  2. Custom editor descriptor to add new parameter (limited word count) to your custom plugin above.
  3. Push error notification to episerver then perfect case!

That is client side, otherwise you also can listen content saving event and validate word cout for the property as well.

// Ha Bui

Jul 03, 2019 11:54


For simplicity another approach would just be to go with a ValidationAttribute.

Definitely not saying this is perfect, but it should give you a start:

[AttributeUsage(AttributeTargets.Property | AttributeTargets.Field)]
public class MaxWordsAttribute : ValidationAttribute
    private readonly int _maxWords;

    public MaxWordsAttribute(int maxWords)
        _maxWords = maxWords;

    protected override ValidationResult IsValid(object value, ValidationContext validationContext)
        // Allow null
        if (!(value is XhtmlString xhtmlString))
            return ValidationResult.Success;

        var doc = new HtmlDocument();

        var words = new List<string>();

        foreach (var node in doc.DocumentNode.SelectNodes("//text()"))
            if (string.IsNullOrEmpty(node.InnerText))

            var text = HttpUtility.HtmlDecode(node.InnerText);

            words.AddRange(text.Split(new[] {' ', '\r', '\n'}, StringSplitOptions.RemoveEmptyEntries)
                .Where(x => !string.IsNullOrWhiteSpace(x)));

        return words.Count <= _maxWords
            ? ValidationResult.Success
            : new ValidationResult(FormatErrorMessage(validationContext.DisplayName));

    public override string FormatErrorMessage(string name)
        if (string.IsNullOrEmpty(ErrorMessage))
            ErrorMessage = "{0} must have {1} words or fewer.";

        return string.Format(CultureInfo.InvariantCulture, ErrorMessageString, name, _maxWords);

You'll need to install HtmlAgilityPack as it takes advantage of it's HTML parsing functionality.

Then it's as simple as:

public virtual XhtmlString MainBody { get; set; }
Jul 03, 2019 22:27
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