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NopTextAreaTagHelper.cs

using Microsoft.AspNetCore.Mvc.TagHelpers;
using Microsoft.AspNetCore.Mvc.ViewFeatures;
using Microsoft.AspNetCore.Razor.TagHelpers;

namespace Nop.Web.Framework.TagHelpers.Admin;

/// <summary>
/// "nop-textarea" tag helper
/// </summary>
[HtmlTargetElement("nop-textarea", Attributes = FOR_ATTRIBUTE_NAME)]
public partial class NopTextAreaTagHelper : TextAreaTagHelper
{
    #region Constants

    protected const string FOR_ATTRIBUTE_NAME = "asp-for";
    protected const string REQUIRED_ATTRIBUTE_NAME = "asp-required";
    protected const string CUSTOM_HTML_ATTRIBUTES = "html-attributes";

    #endregion

    #region Ctor

    public NopTextAreaTagHelper(IHtmlGenerator generator) : base(generator)
    {
    }

    #endregion

    #region Methods

    /// <summary>
    /// Asynchronously executes the tag helper with the given context and output
    /// </summary>
    /// <param name="context">Contains information associated with the current HTML tag</param>
    /// <param name="output">A stateful HTML element used to generate an HTML tag</param>
    /// <returns>A task that represents the asynchronous operation</returns>
    public override async Task ProcessAsync(TagHelperContext context, TagHelperOutput output)
    {
        ArgumentNullException.ThrowIfNull(context);

        ArgumentNullException.ThrowIfNull(output);

        //tag details
        output.TagName = "textarea";
        output.TagMode = TagMode.StartTagAndEndTag;

        //merge classes
        var classValue = output.Attributes.ContainsName("class")
            ? $"{output.Attributes["class"].Value} form-control"
            : "form-control";
        output.Attributes.SetAttribute("class", classValue);

        //set custom html attributes
        var htmlAttributesDictionary = HtmlHelper.AnonymousObjectToHtmlAttributes(CustomHtmlAttributes);
        if (htmlAttributesDictionary?.Count > 0)
        {
            foreach (var (key, value) in htmlAttributesDictionary)
            {
                output.Attributes.Add(key, value);
            }
        }

        //additional parameters
        var rowsNumber = output.Attributes.ContainsName("rows") ? output.Attributes["rows"].Value : 4;
        output.Attributes.SetAttribute("rows", rowsNumber);
        var colsNumber = output.Attributes.ContainsName("cols") ? output.Attributes["cols"].Value : 20;
        output.Attributes.SetAttribute("cols", colsNumber);

        //required asterisk
        if (bool.TryParse(IsRequired, out var required) && required)
        {
            output.PreElement.SetHtmlContent("<div class='input-group input-group-required'>");
            output.PostElement.SetHtmlContent("<div class=\"input-group-btn\"><span class=\"required\">*</span></div></div>");
        }

        await base.ProcessAsync(context, output);
    }

    #endregion

    #region Properties

    /// <summary>
    /// Custom html attributes
    /// </summary>
    [HtmlAttributeName(CUSTOM_HTML_ATTRIBUTES)]
    public object CustomHtmlAttributes { set; get; }

    /// <summary>
    /// Indicates whether the field is required
    /// </summary>
    [HtmlAttributeName(REQUIRED_ATTRIBUTE_NAME)]
    public string IsRequired { set; get; }

    #endregion
}