Frontend Placeholders from the Backend

(cherry picked from commit 69f5963f6f1e80e3f598bdb13792b7413fcc13b1)

frontend/src/Components/Form/ProviderFieldFormGroup.js

@@ -63,6 +63,7 @@ function ProviderFieldFormGroup(props) {
     label,
     helpText,
     helpLink,
+    placeholder,
     value,
     type,
     advanced,
@@ -95,6 +96,7 @@ function ProviderFieldFormGroup(props) {
         label={label}
         helpText={helpText}
         helpLink={helpLink}
+        placeholder={placeholder}
         value={value}
         values={getSelectValues(selectOptions)}
         errors={errors}
@@ -120,6 +122,7 @@ ProviderFieldFormGroup.propTypes = {
   label: PropTypes.string.isRequired,
   helpText: PropTypes.string,
   helpLink: PropTypes.string,
+  placeholder: PropTypes.string,
   value: PropTypes.any,
   type: PropTypes.string.isRequired,
   advanced: PropTypes.bool.isRequired,

src/NzbDrone.Core/Annotations/FieldDefinitionAttribute.cs

@@ -23,6 +23,7 @@ namespace NzbDrone.Core.Annotations
         public string Section { get; set; }
         public HiddenType Hidden { get; set; }
         public PrivacyLevel Privacy { get; set; }
+        public string Placeholder { get; set; }
     }
 
     [AttributeUsage(AttributeTargets.Property | AttributeTargets.Field, AllowMultiple = false)]

src/Readarr.Http/ClientSchema/Field.cs

@@ -18,6 +18,7 @@ namespace Readarr.Http.ClientSchema
         public string SelectOptionsProviderAction { get; set; }
         public string Section { get; set; }
         public string Hidden { get; set; }
+        public string Placeholder { get; set; }
 
         public Field Clone()
         {

src/Readarr.Http/ClientSchema/SchemaBuilder.cs

@@ -103,7 +103,8 @@ namespace Readarr.Http.ClientSchema
                         Order = fieldAttribute.Order,
                         Advanced = fieldAttribute.Advanced,
                         Type = fieldAttribute.Type.ToString().FirstCharToLower(),
-                        Section = fieldAttribute.Section
+                        Section = fieldAttribute.Section,
+                        Placeholder = fieldAttribute.Placeholder
                     };
 
                     if (fieldAttribute.Type == FieldType.Select)