Add placeholder support for project_users_select_tag

app/assets/javascripts/project_users_select.js.coffee

@@ -20,8 +20,9 @@ $ ->
 
   $('.ajax-project-users-select').each (i, select) ->
     project_id = $('body').data('project-id')
+
     $(select).select2
-      placeholder: "Search for a user"
+      placeholder: $(select).data('placeholder') || "Search for a user"
       multiple: $(select).hasClass('multiselect')
       minimumInputLength: 0
       query: (query) ->

app/helpers/selects_helper.rb

@@ -13,7 +13,8 @@ module SelectsHelper
     css_class << "multiselect " if opts[:multiple]
     css_class << (opts[:class] || '')
     value = opts[:selected] || ''
+    placeholder = opts[:placeholder] || 'Select user'
 
-    hidden_field_tag(id, value, class: css_class)
+    hidden_field_tag(id, value, class: css_class, 'data-placeholder' => placeholder)
   end
 end

app/views/projects/issues/_issues.html.haml

@@ -6,7 +6,7 @@
         = form_tag bulk_update_project_issues_path(@project), method: :post  do
           %span Update selected issues with  
           = select_tag('update[status]', options_for_select(['open', 'closed']), prompt: "Status")
-          = project_users_select_tag('update[assignee_id]')
+          = project_users_select_tag('update[assignee_id]', placeholder: 'Assignee')
           = select_tag('update[milestone_id]', bulk_update_milestone_options, prompt: "Milestone")
           = hidden_field_tag 'update[issues_ids]', []
           = hidden_field_tag :status, params[:status]