From c1007377ba010448e55030c37f3fee24208e9912 Mon Sep 17 00:00:00 2001
From: David Heinemeier Hansson <david@loudthinking.com>
Date: Sun, 11 Sep 2005 07:52:53 +0000
Subject: Added in-place editing support in the spirit of auto complete with
 ActionController::Base.in_place_edit_for,
 JavascriptHelper#in_place_editor_field, and Javascript support from
 script.aculo.us #2038 [Jon Tirsen] Moved auto-completion and in-place editing
 into the Macros module and their helper counterparts into
 JavaScriptMacrosHelper

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@2191 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
---
 .../helpers/java_script_macros_helper.rb           | 139 +++++++++++++++++++++
 1 file changed, 139 insertions(+)
 create mode 100644 actionpack/lib/action_view/helpers/java_script_macros_helper.rb

(limited to 'actionpack/lib/action_view/helpers/java_script_macros_helper.rb')

diff --git a/actionpack/lib/action_view/helpers/java_script_macros_helper.rb b/actionpack/lib/action_view/helpers/java_script_macros_helper.rb
new file mode 100644
index 0000000000..1d24b8e6d4
--- /dev/null
+++ b/actionpack/lib/action_view/helpers/java_script_macros_helper.rb
@@ -0,0 +1,139 @@
+require File.dirname(__FILE__) + '/tag_helper'
+
+module ActionView
+  module Helpers
+    # Provides a set of helpers for creating JavaScript macros that rely on and often bundle methods from JavaScriptHelper into
+    # larger units. These macros also rely on counter parts in the controller that provides them with their backing. The in-place
+    # editing relies on ActionController::Base.in_place_edit_for and the auto completion relies on 
+    # ActionController::Base.auto_complete_for.
+    module JavaScriptMacroHelper
+      # Makes an HTML element specified by the DOM ID +field_id+ become an in-place
+      # editor of a property.
+      #
+      # A form is automatically created and displayed when the user clicks the element,
+      # something like this:
+      # <form id="myElement-in-place-edit-form" target="specified url">
+      #   <input name="value" text="The content of myElement"/>
+      #   <input type="submit" value="ok"/>
+      #   <a onclick="javascript to cancel the editing">cancel</a>
+      # </form>
+      # 
+      # The form is serialized and sent to the server using an AJAX call, the action on
+      # the server should process the value and return the updated value in the body of
+      # the reponse. The element will automatically be updated with the changed value
+      # (as returned from the server).
+      # 
+      # Required +options+ are:
+      # <tt>:url</tt>::       Specifies the url where the updated value should
+      #                       be sent after the user presses "ok".
+      # 
+      # Addtional +options+ are:
+      # <tt>:rows</tt>::        Number of rows (more than 1 will use a TEXTAREA)
+      # <tt>:cancel_text</tt>:: The text on the cancel link. (default: "cancel")
+      # <tt>:ok_text</tt>::     The text on the save link. (default: "ok")
+      # <tt>:options</tt>::     Pass through options to the AJAX call (see prototype's Ajax.Updater)
+      # <tt>:with</tt>::        JavaScript snippet that should return what is to be sent
+      #                         in the AJAX call, +form+ is an implicit parameter
+      def in_place_editor(field_id, options = {})
+        function =  "new Ajax.InPlaceEditor("
+        function << "'#{field_id}', "
+        function << "'#{url_for(options[:url])}'"
+
+        js_options = {}
+        js_options['cancelText'] = options[:cancel_text] if options[:cancel_text]
+        js_options['okText'] = options[:save_text] if options[:save_text]
+        js_options['rows'] = options[:rows] if options[:rows]
+        js_options['ajaxOptions'] = options[:options] if options[:options]
+        js_options['callback']   = "function(form) { return #{options[:with]} }" if options[:with]
+        function << (', ' + options_for_javascript(js_options)) unless js_options.empty?
+        
+        function << ')'
+
+        javascript_tag(function)
+      end
+      
+      # Renders the value of the specified object and method with in place editing capabilities.
+      #
+      # See the RDoc on ActionController::InPlaceEditing to learn more about this.
+      def in_place_editor_field(object, method, tag_options = {}, in_place_editor_options = {})
+        tag = ::ActionView::Helpers::InstanceTag.new(object, method, self)
+        tag_options = {:tag => "span", :id => "#{object}_#{method}_#{tag.object.id}_in_place_editor", :class => "in_place_editor_field"}.merge!(tag_options)
+        in_place_editor_options[:url] = in_place_editor_options[:url] || url_for({ :action => "set_#{object}_#{method}", :id => tag.object.id })
+        tag.to_content_tag(tag_options[:tag], tag_options) +
+        in_place_editor(tag_options[:id], in_place_editor_options)
+      end
+      
+      # Adds AJAX autocomplete functionality to the text input field with the 
+      # DOM ID specified by +field_id+.
+      #
+      # This function expects that the called action returns a HTML <ul> list,
+      # or nothing if no entries should be displayed for autocompletion.
+      #
+      # You'll probably want to turn the browser's built-in autocompletion off,
+      # su be sure to include a autocomplete="off" attribute with your text
+      # input field.
+      # 
+      # Required +options+ are:
+      # <tt>:url</tt>::       Specifies the DOM ID of the element whose
+      #                       innerHTML should be updated with the autocomplete
+      #                       entries returned by XMLHttpRequest.
+      # 
+      # Addtional +options+ are:
+      # <tt>:update</tt>::    Specifies the DOM ID of the element whose 
+      #                       innerHTML should be updated with the autocomplete
+      #                       entries returned by the AJAX request. 
+      #                       Defaults to field_id + '_auto_complete'
+      # <tt>:with</tt>::      A JavaScript expression specifying the
+      #                       parameters for the XMLHttpRequest. This defaults
+      #                       to 'fieldname=value'.
+      # <tt>:indicator</tt>:: Specifies the DOM ID of an elment which will be
+      #                       displayed while autocomplete is running. 
+      def auto_complete_field(field_id, options = {})
+        function =  "new Ajax.Autocompleter("
+        function << "'#{field_id}', "
+        function << "'" + (options[:update] || "#{field_id}_auto_complete") + "', "
+        function << "'#{url_for(options[:url])}'"
+        
+        js_options = {}
+        js_options[:tokens] = array_or_string_for_javascript(options[:tokens]) if options[:tokens]
+        js_options[:callback]   = "function(element, value) { return #{options[:with]} }" if options[:with]
+        js_options[:indicator]  = "'#{options[:indicator]}'" if options[:indicator]
+        function << (', ' + options_for_javascript(js_options) + ')')
+
+        javascript_tag(function)
+      end
+      
+      # Use this method in your view to generate a return for the AJAX automplete requests.
+      #
+      # Example action:
+      #
+      #   def auto_complete_for_item_title
+      #     @items = Item.find(:all, 
+      #       :conditions => [ 'LOWER(description) LIKE ?', 
+      #       '%' + request.raw_post.downcase + '%' ])
+      #     render :inline => '<%= auto_complete_result(@items, 'description') %>'
+      #   end
+      #
+      # The auto_complete_result can of course also be called from a view belonging to the 
+      # auto_complete action if you need to decorate it further.
+      def auto_complete_result(entries, field, phrase = nil)
+        return unless entries
+        items = entries.map { |entry| content_tag("li", phrase ? highlight(entry[field], phrase) : h(entry[field])) }
+        content_tag("ul", items.uniq)
+      end
+      
+      # Wrapper for text_field with added AJAX autocompletion functionality.
+      #
+      # In your controller, you'll need to define an action called
+      # auto_complete_for_object_method to respond the AJAX calls,
+      # 
+      # See the RDoc on ActionController::AutoComplete to learn more about this.
+      def text_field_with_auto_complete(object, method, tag_options = {}, completion_options = {})
+        (completion_options[:skip_style] ? "" : auto_complete_stylesheet) +
+        text_field(object, method, { :autocomplete => "off" }.merge!(tag_options)) +
+        content_tag("div", "", :id => "#{object}_#{method}_auto_complete", :class => "auto_complete") +
+        auto_complete_field("#{object}_#{method}", { :url => { :action => "auto_complete_for_#{object}_#{method}" } }.update(completion_options))
+      end
+    end
+  end
+end
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