1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
|
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 counterparts in the controller that provide them with their backing. The in-place
# editing relies on ActionController::Base.in_place_edit_for and the autocompletion relies on
# ActionController::Base.auto_complete_for.
module JavaScriptMacrosHelper
# 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>:save_text</tt>:: The text on the save link. (default: "ok")
# <tt>:external_control</tt>:: The id of an external control used to enter edit mode.
# <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['externalControl'] = options[:external_control] if options[:external_control]
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.delete(: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>:: URL to call for autocompletion results
# in url_for format.
#
# 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 element which will be
# displayed while autocomplete is running.
# <tt>:tokens</tt>:: A string or an array of strings containing
# separator tokens for tokenized incremental
# autocompletion. Example: <tt>:tokens => ','</tt> would
# allow multiple autocompletion entries, separated
# by commas.
# <tt>:min_chars</tt>:: The minimum number of characters that should be
# in the input field before an Ajax call is made
# to the server.
# <tt>:on_hide</tt>:: A Javascript expression that is called when the
# autocompletion div is hidden. The expression
# should take two variables: element and update.
# Element is a DOM element for the field, update
# is a DOM element for the div from which the
# innerHTML is replaced.
# <tt>:on_show</tt>:: Like on_hide, only now the expression is called
# then the div is shown.
# <tt>:select</tt>:: Pick the class of the element from which the value for
# insertion should be extracted. If this is not specified,
# the entire element is used.
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]
{ :on_show => :onShow, :on_hide => :onHide, :min_chars => :min_chars, :select => :select }.each do |k,v|
js_options[v] = options[k] if options[k]
end
function << (', ' + options_for_javascript(js_options) + ')')
javascript_tag(function)
end
# Use this method in your view to generate a return for the AJAX autocomplete 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, 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
private
def auto_complete_stylesheet
content_tag("style", <<-EOT
div.auto_complete {
width: 350px;
background: #fff;
}
div.auto_complete ul {
border:1px solid #888;
margin:0;
padding:0;
width:100%;
list-style-type:none;
}
div.auto_complete ul li {
margin:0;
padding:3px;
}
div.auto_complete ul li.selected {
background-color: #ffb;
}
div.auto_complete ul strong.highlight {
color: #800;
margin:0;
padding:0;
}
EOT
)
end
end
end
end
|