kreta/KretaWeb/Helpers/TextareaExtensions.cs

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Linq.Expressions;
using System.Text;
using System.Web;
using System.Web.Mvc;
using System.Web.Mvc.Html;

namespace Kreta.Web.Helpers
{
    public static class TextareaExtensions
    {
        public static MvcHtmlString KretaTextArea(this HtmlHelper helper, string name, List<string> value, int rows = 3, Dictionary<string, object> htmlAttributes = null)
        {
            StringBuilder textareaSB = new StringBuilder();

            textareaSB.Append("<textarea id='" + name + "'  name='" + name + "' rows='" + rows + "' ");
            if (htmlAttributes != null)
            {
                if (htmlAttributes.ContainsKey("class"))
                {
                    htmlAttributes["class"] += " k-textbox";
                }
                else
                {
                    htmlAttributes.Add("class", "k-textbox");
                }

                foreach (var item in htmlAttributes)
                {
                    textareaSB.Append(item.Key.ToString() + "='" + item.Value.ToString() + "'");
                }
            }
            textareaSB.AppendFormat(">{0}</textarea>", HttpUtility.HtmlEncode(string.Join("\n", value)));

            return new MvcHtmlString(textareaSB.ToString());
        }

        public static MvcHtmlString KretaTextAreaFor<TModel, TValue>(this HtmlHelper<TModel> helper, Expression<Func<TModel, TValue>> expression, int rows = 3, Dictionary<string, object> htmlAttributes = null)
        {
            var fieldName = ExpressionHelper.GetExpressionText(expression);
            var fullBindingName = helper.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldName(fieldName);
            var metadata = ModelMetadata.FromLambdaExpression(expression, helper.ViewData);
            var value = metadata.Model;

            if (htmlAttributes == null)
                htmlAttributes = new Dictionary<string, object>();

            var attributes = Mapper.GetUnobtrusiveValidationAttributes(helper, expression, htmlAttributes, metadata);

            foreach (var key in attributes.Keys)
            {
                if (!htmlAttributes.ContainsKey(key))
                {
                    htmlAttributes.Add(key, attributes[key].ToString());
                }
            }

            var validationAttributes = helper.GetUnobtrusiveValidationAttributes(fullBindingName, metadata);

            if (metadata.IsRequired)
            { htmlAttributes.Add("data-labelmsg", metadata.DisplayName + " *"); }
            else
            {
                if (metadata.DisplayName == null)
                {
                    htmlAttributes.Add("data-labelmsg", "");
                }
                else
                {
                    htmlAttributes.Add("data-labelmsg", metadata.DisplayName);
                }
            }

            if (htmlAttributes.ContainsKey("class"))
            {
                htmlAttributes["class"] += " k-textbox";
            }
            else
            {
                htmlAttributes.Add("class", "k-textbox");
            }

            if (expression.Body is MemberExpression me && me.Member != null)
            {
                int maxLength = 0;

                MaxLengthAttribute maxLengthAttribute = me.Member.GetCustomAttributes(typeof(MaxLengthAttribute), false).Cast<MaxLengthAttribute>().FirstOrDefault();

                if (maxLengthAttribute != null)
                {
                    maxLength = maxLengthAttribute.Length;
                }
                else
                {
                    StringLengthAttribute stringLengthAttribute = me.Member.GetCustomAttributes(typeof(StringLengthAttribute), false).Cast<StringLengthAttribute>().FirstOrDefault();

                    if (stringLengthAttribute != null)
                    {
                        maxLength = stringLengthAttribute.MaximumLength;
                    }
                }

                if (maxLength > 0)
                {
                    htmlAttributes["maxlength"] = maxLength.ToString();
                }
            }

            StringBuilder textareaSB = new StringBuilder();
            textareaSB.Append("<textarea id='" + fieldName.Replace(".", "_") + "' name='" + fieldName + "' rows='" + rows + "' ");

            foreach (var item in htmlAttributes)
            {
                textareaSB.Append(item.Key.ToString() + "='" + item.Value.ToString() + "' ");
            }

            textareaSB.Append(">").Append(HttpUtility.HtmlEncode(value)).Append("</textarea>");

            return new MvcHtmlString(textareaSB.ToString());
        }

        public static MvcHtmlString RenderWithName(this MvcHtmlString helper, int labelWidth = 6, int inputWidth = 6, bool allSizeSame = false, string customLabelDivClass = "", string customLabelClass = "", string tooltipResource = null)
        {
            StringBuilder sb = new StringBuilder();

            /*Hack hogy kiszedjük a stringből a labelMsg-t*/
            int startIndex = helper.ToString().IndexOf("data-labelmsg");
            string str = helper.ToString().Substring(startIndex + 15).Replace("</textarea>", "");
            int startIndex2 = str.IndexOf("'");
            string labelMsg = str.Substring(0, startIndex2);
            /*Hack hogy kiszedjük a stringből a labelMsg-t*/

            /*Hack hogy kiszedjük a stringből az Id-t*/
            int startIndexId = helper.ToString().IndexOf("id");
            int startIndexName = helper.ToString().IndexOf("name");
            string str2 = helper.ToString().Substring(0, startIndexName).Replace("<textarea id='", "");
            int startIndex2Id = str2.IndexOf("'");
            string labelMsg2 = str2.Substring(0, startIndex2Id);
            /*Hack hogy kiszedjük a stringből a labelMsg-t*/

            if (string.IsNullOrWhiteSpace(tooltipResource))
                AddRenderWithNameBeginingFrame(sb, labelWidth, inputWidth, allSizeSame, labelMsg2, labelMsg, string.Empty);
            else
                AddRenderWithNameTooltipBeginingFrame(sb, labelWidth, inputWidth, allSizeSame, labelMsg2, labelMsg, string.Empty, tooltipResource);

            sb.Append(helper.ToHtmlString());
            AddRenderWithNameCloseingFrame(sb);

            return new MvcHtmlString(sb.ToString());
        }

        public static MvcHtmlString RenderWithName(this MvcHtmlString helper, string label, int labelWidth = 6, int inputWidth = 6, bool allSizeSame = false, string tooltipResource = null)
        {
            StringBuilder sb = new StringBuilder();

            if (string.IsNullOrWhiteSpace(tooltipResource))
                AddRenderWithNameBeginingFrame(sb, labelWidth, inputWidth, allSizeSame, string.Empty, label, string.Empty);
            else
                AddRenderWithNameTooltipBeginingFrame(sb, labelWidth, inputWidth, allSizeSame, string.Empty, label, string.Empty, tooltipResource);

            sb.Append(helper.ToHtmlString());
            AddRenderWithNameCloseingFrame(sb);

            return new MvcHtmlString(sb.ToString());
        }

        public static MvcHtmlString Render(this MvcHtmlString helper, int labelWidth = 6, int inputWidth = 6, bool allSizeSame = false)
        {
            StringBuilder sb = new StringBuilder();

            AddRenderWithNameBeginingFrame(sb, labelWidth, inputWidth, allSizeSame, string.Empty, string.Empty, string.Empty);
            sb.Append(helper.ToHtmlString());
            AddRenderWithNameCloseingFrame(sb);

            return new MvcHtmlString(sb.ToString());
        }

        private static void AddRenderWithNameBeginingFrame(StringBuilder sb, int labelWidth, int inputWidth, bool allSizeSame, string controlName, string labelMsg, string customClass)
        {
            sb.AppendFormat("<div class=\"{0} {1} \">", BootsrapHelper.GetSizeClasses(labelWidth, allSizeSame), customClass);
            sb.AppendFormat("<label class=\"windowInputLabel\" for=\"{0}\">{1}</label>", controlName, labelMsg);
            sb.AppendFormat("</div><div class=\"{0} {1}\">", BootsrapHelper.GetSizeClasses(inputWidth, allSizeSame), customClass);
        }

        private static void AddRenderWithNameTooltipBeginingFrame(StringBuilder sb, int labelWidth, int inputWidth, bool allSizeSame, string controlName, string labelMsg, string customClass, string tooltipResource)
        {
            sb.AppendFormat("<div class=\"{0} {1} kretaLabelTooltip \">", BootsrapHelper.GetSizeClasses(labelWidth, allSizeSame), customClass);
            sb.AppendFormat("<label class=\"windowInputLabel\" for=\"{0}\">{1}", controlName, labelMsg);
            sb.Append("&nbsp;<img class='kretaLabelTooltipImg' />");
            sb.AppendFormat("<span class=\"kretaLabelTooltipText\">{0}</span>", tooltipResource);
            sb.Append("</label>");
            sb.AppendFormat("</div><div class=\"{0} {1}\">", BootsrapHelper.GetSizeClasses(inputWidth, allSizeSame), customClass);
        }

        private static void AddRenderWithNameCloseingFrame(StringBuilder sb)
        {
            sb.Append("</div>");
        }
    }
}