Added Info text to abp-input tag helper

framework/src/Volo.Abp.AspNetCore.Mvc.UI.Bootstrap/TagHelpers/Form/AbpInputTagHelperService.cs

@@ -60,10 +60,11 @@ namespace Volo.Abp.AspNetCore.Mvc.UI.Bootstrap.TagHelpers.Form
             var inputTag = GetInputTagHelperOutput(context, output, out isCheckbox);
             var inputHtml = RenderTagHelperOutput(inputTag, _encoder);
             var label = GetLabelAsHtml(context, output, inputTag, isCheckbox);
+            var info = GetInfoAsHtml(context, output, inputTag, isCheckbox);
 
             var validation = isCheckbox ? "" : GetValidationAsHtml(context, output, inputTag);
 
-            return GetContent(context, output, label, inputHtml, validation, isCheckbox);
+            return GetContent(context, output, label, inputHtml, validation, info, isCheckbox);
         }
 
         protected virtual string GetValidationAsHtml(TagHelperContext context, TagHelperOutput output, TagHelperOutput inputTag)
@@ -84,14 +85,14 @@ namespace Volo.Abp.AspNetCore.Mvc.UI.Bootstrap.TagHelpers.Form
             return RenderTagHelper(attributeList, context, validationMessageTagHelper, _encoder, "span", TagMode.StartTagAndEndTag, true);
         }
 
-        protected virtual string GetContent(TagHelperContext context, TagHelperOutput output, string label, string inputHtml, string validation, bool isCheckbox)
+        protected virtual string GetContent(TagHelperContext context, TagHelperOutput output, string label, string inputHtml, string validation, string infoHtml, bool isCheckbox)
         {
             var innerContent = isCheckbox ?
                 inputHtml + Environment.NewLine + label :
                 label + Environment.NewLine + inputHtml;
 
             return Environment.NewLine + innerContent + Environment.NewLine +
-                Environment.NewLine + validation + Environment.NewLine;
+                Environment.NewLine + validation + Environment.NewLine + infoHtml;
         }
 
         protected virtual string SurroundInnerHtmlAndGet(TagHelperContext context, TagHelperOutput output, string innerHtml, bool isCheckbox)
@@ -134,6 +135,7 @@ namespace Volo.Abp.AspNetCore.Mvc.UI.Bootstrap.TagHelpers.Form
             AddFormControlClass(context, output, isCheckbox, inputTagHelperOutput);
             AddReadOnlyAttribute(inputTagHelperOutput);
             AddPlaceholderAttribute(inputTagHelperOutput);
+            AddInfoTextId(inputTagHelperOutput);
 
             return inputTagHelperOutput;
         }
@@ -196,6 +198,23 @@ namespace Volo.Abp.AspNetCore.Mvc.UI.Bootstrap.TagHelpers.Form
             }
         }
 
+        protected virtual void AddInfoTextId(TagHelperOutput inputTagHelperOutput)
+        {
+            if (GetAttribute<InputInfoText>(TagHelper.AspFor.ModelExplorer) == null)
+            {
+                return;
+            }
+
+            var idAttr = inputTagHelperOutput.Attributes.FirstOrDefault(a => a.Name == "id");
+
+            if (idAttr == null)
+            {
+                return;
+            }
+
+            inputTagHelperOutput.Attributes.Add("aria-describedby", LocalizeText(idAttr.Value + "InfoText"));
+        }
+
         protected virtual string LocalizeText(string text)
         {
             IStringLocalizer localizer = null;
@@ -233,6 +252,33 @@ namespace Volo.Abp.AspNetCore.Mvc.UI.Bootstrap.TagHelpers.Form
                    "</label>";
         }
 
+        protected virtual string GetInfoAsHtml(TagHelperContext context, TagHelperOutput output, TagHelperOutput inputTag, bool isCheckbox)
+        {
+            if (isCheckbox)
+            {
+                return "";
+            }
+
+            var infoAttribute = GetAttribute<InputInfoText>(TagHelper.AspFor.ModelExplorer);
+            if (infoAttribute == null)
+            {
+                return "";
+            }
+
+            var idAttr = inputTag.Attributes.FirstOrDefault(a => a.Name == "id");
+
+            if (idAttr == null)
+            {
+                return "";
+            }
+
+            var id = idAttr.Value + "InfoText";
+
+            return "<small id=\""+ id + "\" class=\"form-text text-muted\">" +
+                   LocalizeText(infoAttribute.Text) +
+                   "</small>";
+        }
+
         protected virtual string GetLabelAsHtmlUsingTagHelper(TagHelperContext context, TagHelperOutput output, bool isCheckbox)
         {
             var labelTagHelper = new LabelTagHelper(_generator)

framework/src/Volo.Abp.AspNetCore.Mvc.UI.Bootstrap/TagHelpers/Form/InputInfoText.cs

@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace Volo.Abp.AspNetCore.Mvc.UI.Bootstrap.TagHelpers.Form
+{
+    [AttributeUsage(AttributeTargets.Property)]
+    public class InputInfoText : Attribute
+    {
+        public string Text { get; set; }
+
+        public InputInfoText(string text)
+        {
+            Text = text;
+        }
+    }
+}

framework/test/Volo.Abp.AspNetCore.Mvc.UI.Bootstrap.Demo/Pages/Components/DynamicForms.cshtml

@@ -74,6 +74,7 @@ public class DynamicFormsModel : PageModel
             
             [TextArea(Rows = 4)]
             [Display(Name = "Description")]
+            [InputInfoText("Describe Yourself")]
             public string Description { get; set; }
 
             [Required]

framework/test/Volo.Abp.AspNetCore.Mvc.UI.Bootstrap.Demo/Pages/Components/DynamicForms.cshtml.cs

@@ -108,6 +108,7 @@ namespace Volo.Abp.AspNetCore.Mvc.UI.Bootstrap.Demo.Pages.Components
             
             [TextArea(Rows = 4)]
             [Display(Name = "Description")]
+            [InputInfoText("Describe Yourself")]
             public string Description { get; set; }
 
             [Required]