Select2 tag for namespaces with ajax loading

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/assets/javascripts/api.js.coffee

@@ -2,6 +2,7 @@
   users_path: "/api/:version/users.json"
   user_path: "/api/:version/users/:id.json"
   notes_path: "/api/:version/projects/:id/notes.json"
+  namespaces_path: "/api/:version/namespaces.json"
 
   # Get 20 (depends on api) recent notes
   # and sort the ascending from oldest to newest
@@ -49,6 +50,20 @@
     ).done (users) ->
       callback(users)
 
+  # Return namespaces list. Filtered by query
+  namespaces: (query, callback) ->
+    url = Api.buildUrl(Api.namespaces_path)
+
+    $.ajax(
+      url: url
+      data:
+        private_token: gon.api_token
+        search: query
+        per_page: 20
+      dataType: "json"
+    ).done (namespaces) ->
+      callback(namespaces)
+
   buildUrl: (url) ->
     url = gon.relative_url_root + url if gon.relative_url_root?
     return url.replace(':version', gon.api_version)

app/assets/javascripts/namespace_select.js.coffee

+$ ->
+  namespaceFormatResult = (namespace) ->
+    markup = "<div class='namespace-result'>"
+    markup += "<span class='namespace-kind'>" + namespace.kind + "</span>"
+    markup += "<span class='namespace-path'>" + namespace.path + "</span>"
+    markup += "</div>"
+    markup
+
+  formatSelection = (namespace) ->
+    namespace.kind + ": " + namespace.path
+
+  $('.ajax-namespace-select').each (i, select) ->
+    $(select).select2
+      placeholder: "Search for namespace"
+      multiple: $(select).hasClass('multiselect')
+      minimumInputLength: 0
+      query: (query) ->
+        Api.namespaces query.term, (namespaces) ->
+          data = { results: namespaces }
+          query.callback(data)
+
+      dropdownCssClass: "ajax-namespace-dropdown"
+      formatResult: namespaceFormatResult
+      formatSelection: formatSelection

app/helpers/namespaces_helper.rb

@@ -16,4 +16,13 @@ module NamespacesHelper
 
     grouped_options_for_select(options, selected)
   end
+
+  def namespace_select_tag(id, opts = {})
+    css_class = "ajax-namespace-select "
+    css_class << "multiselect " if opts[:multiple]
+    css_class << (opts[:class] || '')
+    value = opts[:selected] || ''
+
+    hidden_field_tag(id, value, class: css_class)
+  end
 end