#18182: Implementing Autocompleted on Tags

Work Item: 18182

--HG--
branch : 1.x

src/Orchard.Web/Modules/Orchard.Tags/Controllers/HomeController.cs

@@ -63,5 +63,12 @@ namespace Orchard.Tags.Controllers {
 
             return View(viewModel);
         }
+
+        public JsonResult FetchSimilarTags(string snippet) {
+            return Json(
+                _tagService.GetTagsByNameSnippet(snippet).Select(tag => tag.TagName).ToList(), 
+                JsonRequestBehavior.AllowGet
+            );
+        }
     }
 }

src/Orchard.Web/Modules/Orchard.Tags/Module.txt

@@ -8,7 +8,7 @@ Features:
     Orchard.Tags:
         Name: Tags
         Description: The tags module is providing basic tagging for arbitrary content types. 
-        Dependencies: Settings
+        Dependencies: Settings, Orchard.jQuery
         Category: Navigation
     Orchard.Tags.Projections:
         Name: Tags Projections

src/Orchard.Web/Modules/Orchard.Tags/Orchard.Tags.csproj

@@ -82,6 +82,7 @@
   </ItemGroup>
   <ItemGroup>
     <Content Include="Module.txt" />
+    <Content Include="Scripts\orchard-tags-autocomplete.js" />
     <Content Include="Styles\images\menu.tags.png" />
     <Content Include="Styles\menu.tags-admin.css" />
     <Content Include="Styles\orchard-tags-admin.css" />
@@ -117,6 +118,9 @@
   <ItemGroup>
     <Content Include="web.config" />
   </ItemGroup>
+  <ItemGroup>
+    <Content Include="Scripts\Web.config" />
+  </ItemGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
   <Import Project="$(MSBuildExtensionsPath32)\Microsoft\VisualStudio\v10.0\WebApplications\Microsoft.WebApplication.targets" />
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 

src/Orchard.Web/Modules/Orchard.Tags/ResourceManifest.cs

@@ -3,7 +3,11 @@ using Orchard.UI.Resources;
 namespace Orchard.Tags {
     public class ResourceManifest : IResourceManifestProvider {
         public void BuildManifests(ResourceManifestBuilder builder) {
-            builder.Add().DefineStyle("TagsAdmin").SetUrl("orchard-tags-admin.css");
+            var manifest = builder.Add();
+
+            manifest.DefineScript("TagsAutocomplete").SetUrl("orchard-tags-autocomplete.js").SetDependencies("jQueryUI_Autocomplete");
+
+            manifest.DefineStyle("TagsAdmin").SetUrl("orchard-tags-admin.css");
         }
     }
 }

src/Orchard.Web/Modules/Orchard.Tags/Scripts/Web.config

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration>
+  <appSettings>
+    <add key="webpages:Enabled" value="false" />
+  </appSettings>
+  <system.web>
+    <httpHandlers>
+      <!-- iis6 - for any request in this location, return via managed static file handler -->
+      <add path="*" verb="*" type="System.Web.StaticFileHandler" />
+    </httpHandlers>
+  </system.web>
+  <system.webServer>
+    <handlers accessPolicy="Script,Read">
+      <!--
+      iis7 - for any request to a file exists on disk, return it via native http module.
+      accessPolicy 'Script' is to allow for a managed 404 page.
+      -->
+      <add name="StaticFile" path="*" verb="*" modules="StaticFileModule" preCondition="integratedMode" resourceType="File" requireAccess="Read" />
+    </handlers>
+  </system.webServer>
+</configuration>

src/Orchard.Web/Modules/Orchard.Tags/Scripts/orchard-tags-autocomplete.js

@@ -0,0 +1,57 @@
+(function ($) {
+    $.extend({
+        tagsAutocomplete: {
+            minSnippetLength: 3,
+
+            autocomplete: function (textboxId, fetchUrl, minSnippetLength) {
+                if (minSnippetLength != null) this.minSnippetLength = minSnippetLength;
+
+                function split(val) {
+                    return val.split(/,\s*/);
+                }
+                function extractLast(snippet) {
+                    return split(snippet).pop();
+                }
+
+                var that = this;
+                var textBox = $('#' + textboxId);
+
+                textBox.bind('keydown', function (event) {
+                    // don't navigate away from the field on tab when selecting an item
+                    if (event.keyCode === $.ui.keyCode.TAB && $(this).data('autocomplete').menu.active) {
+                        event.preventDefault();
+                    }
+                }).autocomplete({
+                    source: function (request, response) {
+                        $.getJSON(fetchUrl, {
+                            snippet: extractLast(request.term)
+                        }, response);
+                    },
+                    appendTo: textBox.parent(),
+                    search: function () {
+                        // custom minLength
+                        var snippet = extractLast(this.value);
+                        if (snippet.length < that.minSnippetLength) {
+                            return false;
+                        }
+                    },
+                    focus: function () {
+                        // prevent value inserted on focus
+                        return false;
+                    },
+                    select: function (event, ui) {
+                        var snippets = split(this.value);
+                        // remove the current input
+                        snippets.pop();
+                        // add the selected item
+                        snippets.push(ui.item.value);
+                        // add placeholder to get the comma-and-space at the end
+                        snippets.push('');
+                        this.value = snippets.join(', ');
+                        return false;
+                    }
+                });
+            }
+        }
+    });
+})(jQuery);

src/Orchard.Web/Modules/Orchard.Tags/Services/ITagService.cs

@@ -5,6 +5,14 @@ using Orchard.Tags.Models;
 namespace Orchard.Tags.Services {
     public interface ITagService : IDependency {
         IEnumerable<TagRecord> GetTags();
+
+        /// <summary>
+        /// Returns tags whose name start with snippet
+        /// </summary>
+        /// <param name="snippet">The starting snippet</param>
+        /// <param name="maxCount">Maximum number of tags returned</param>
+        /// <returns>Tags found</returns>
+        IEnumerable<TagRecord> GetTagsByNameSnippet(string snippet, int maxCount = 10);
         TagRecord GetTag(int tagId);
         TagRecord GetTagByName(string tagName);
         IEnumerable<IContent> GetTaggedContentItems(int tagId);

src/Orchard.Web/Modules/Orchard.Tags/Services/TagService.cs

@@ -41,6 +41,11 @@ namespace Orchard.Tags.Services {
             return _tagRepository.Table.ToList();
         }
 
+        public IEnumerable<TagRecord> GetTagsByNameSnippet(string snippet, int maxCount = 10) {
+            if (String.IsNullOrEmpty(snippet)) return null; // Otherwise would return the whole dataset
+            return _tagRepository.Fetch(tag => tag.TagName.StartsWith(snippet)).Take(maxCount);
+        }
+
         public TagRecord GetTag(int tagId) {
             return _tagRepository.Get(x => x.Id == tagId);
         }

src/Orchard.Web/Modules/Orchard.Tags/Views/EditorTemplates/Parts/Tags.cshtml

@@ -1,6 +1,23 @@
 @model Orchard.Tags.ViewModels.EditTagsViewModel
 
+@{
+    Style.Require("jQueryUI_Orchard");
+    Script.Require("TagsAutocomplete");
+}
+
 <fieldset>
     @Html.LabelFor(m => m.Tags, T("Tags"))
     @Html.TextBoxFor(m => m.Tags, new { @class = "large text" })
 </fieldset>
+
+@using (Script.Foot()) {
+<script type="text/javascript">
+//<![CDATA[
+    $(function () {
+        $.tagsAutocomplete.autocomplete(
+            '@Html.FieldIdFor(m => m.Tags)',
+            '@Url.Action("FetchSimilarTags", new { Controller = "Home", Area = "Orchard.Tags" })', 1);
+    });
+//]]>
+</script>
+}