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1 | 1 | # Helpers to sort tables using clickable column headers. |
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2 | 2 | # |
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3 | 3 | # Author: Stuart Rackham <srackham@methods.co.nz>, March 2005. |
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4 | 4 | # License: This source code is released under the MIT license. |
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5 | 5 | # |
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6 | 6 | # - Consecutive clicks toggle the column's sort order. |
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7 | 7 | # - Sort state is maintained by a session hash entry. |
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8 | 8 | # - Icon image identifies sort column and state. |
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9 | 9 | # - Typically used in conjunction with the Pagination module. |
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10 | 10 | # |
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11 | 11 | # Example code snippets: |
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12 | 12 | # |
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13 | 13 | # Controller: |
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14 | 14 | # |
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15 | 15 | # helper :sort |
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16 | 16 | # include SortHelper |
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17 | 17 | # |
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18 | 18 | # def list |
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19 | 19 | # sort_init 'last_name' |
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20 | 20 | # sort_update |
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21 | 21 | # @items = Contact.find_all nil, sort_clause |
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22 | 22 | # end |
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23 | 23 | # |
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24 | 24 | # Controller (using Pagination module): |
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25 | 25 | # |
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26 | 26 | # helper :sort |
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27 | 27 | # include SortHelper |
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28 | 28 | # |
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29 | 29 | # def list |
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30 | 30 | # sort_init 'last_name' |
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31 | 31 | # sort_update |
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32 | 32 | # @contact_pages, @items = paginate :contacts, |
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33 | 33 | # :order_by => sort_clause, |
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34 | 34 | # :per_page => 10 |
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35 | 35 | # end |
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36 | 36 | # |
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37 | 37 | # View (table header in list.rhtml): |
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38 | 38 | # |
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39 | 39 | # <thead> |
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40 | 40 | # <tr> |
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41 | 41 | # <%= sort_header_tag('id', :title => 'Sort by contact ID') %> |
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42 | 42 | # <%= sort_header_tag('last_name', :caption => 'Name') %> |
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43 | 43 | # <%= sort_header_tag('phone') %> |
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44 | 44 | # <%= sort_header_tag('address', :width => 200) %> |
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45 | 45 | # </tr> |
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46 | 46 | # </thead> |
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47 | 47 | # |
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48 | 48 | # - The ascending and descending sort icon images are sort_asc.png and |
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49 | 49 | # sort_desc.png and reside in the application's images directory. |
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50 | 50 | # - Introduces instance variables: @sort_name, @sort_default. |
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51 | 51 | # - Introduces params :sort_key and :sort_order. |
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52 | 52 | # |
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53 | 53 | module SortHelper |
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54 | 54 | |
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55 | 55 | # Initializes the default sort column (default_key) and sort order |
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56 | 56 | # (default_order). |
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57 | 57 | # |
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58 | 58 | # - default_key is a column attribute name. |
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59 | 59 | # - default_order is 'asc' or 'desc'. |
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60 | 60 | # - name is the name of the session hash entry that stores the sort state, |
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61 | 61 | # defaults to '<controller_name>_sort'. |
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62 | 62 | # |
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63 | 63 | def sort_init(default_key, default_order='asc', name=nil) |
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64 | 64 | @sort_name = name || params[:controller] + params[:action] + '_sort' |
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65 | 65 | @sort_default = {:key => default_key, :order => default_order} |
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66 | 66 | end |
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67 | 67 | |
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68 | 68 | # Updates the sort state. Call this in the controller prior to calling |
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69 | 69 | # sort_clause. |
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70 | 70 | # |
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71 | 71 | def sort_update() |
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72 | 72 | if params[:sort_key] |
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73 | 73 | sort = {:key => params[:sort_key], :order => params[:sort_order]} |
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74 | 74 | elsif session[@sort_name] |
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75 | 75 | sort = session[@sort_name] # Previous sort. |
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76 | 76 | else |
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77 | 77 | sort = @sort_default |
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78 | 78 | end |
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79 | 79 | session[@sort_name] = sort |
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80 | 80 | end |
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81 | 81 | |
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82 | 82 | # Returns an SQL sort clause corresponding to the current sort state. |
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83 | 83 | # Use this to sort the controller's table items collection. |
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84 | 84 | # |
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85 | 85 | def sort_clause() |
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86 | session[@sort_name][:key] + ' ' + session[@sort_name][:order] | |
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86 | session[@sort_name][:key] + ' ' + (session[@sort_name][:order] || 'ASC') | |
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87 | 87 | end |
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88 | 88 | |
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89 | 89 | # Returns a link which sorts by the named column. |
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90 | 90 | # |
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91 | 91 | # - column is the name of an attribute in the sorted record collection. |
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92 | 92 | # - The optional caption explicitly specifies the displayed link text. |
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93 | 93 | # - A sort icon image is positioned to the right of the sort link. |
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94 | 94 | # |
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95 | 95 | def sort_link(column, caption, default_order) |
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96 | 96 | key, order = session[@sort_name][:key], session[@sort_name][:order] |
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97 | 97 | if key == column |
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98 | 98 | if order.downcase == 'asc' |
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99 | 99 | icon = 'sort_asc.png' |
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100 | 100 | order = 'desc' |
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101 | 101 | else |
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102 | 102 | icon = 'sort_desc.png' |
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103 | 103 | order = 'asc' |
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104 | 104 | end |
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105 | 105 | else |
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106 | 106 | icon = nil |
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107 | 107 | order = default_order |
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108 | 108 | end |
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109 | 109 | caption = titleize(Inflector::humanize(column)) unless caption |
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110 | 110 | |
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111 | 111 | sort_options = { :sort_key => column, :sort_order => order } |
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112 | 112 | # don't reuse params if filters are present |
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113 | 113 | url_options = params.has_key?(:set_filter) ? sort_options : params.merge(sort_options) |
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114 | 114 | |
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115 | 115 | link_to_remote(caption, |
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116 | 116 | {:update => "content", :url => url_options}, |
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117 | 117 | {:href => url_for(url_options)}) + |
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118 | 118 | (icon ? nbsp(2) + image_tag(icon) : '') |
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119 | 119 | end |
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120 | 120 | |
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121 | 121 | # Returns a table header <th> tag with a sort link for the named column |
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122 | 122 | # attribute. |
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123 | 123 | # |
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124 | 124 | # Options: |
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125 | 125 | # :caption The displayed link name (defaults to titleized column name). |
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126 | 126 | # :title The tag's 'title' attribute (defaults to 'Sort by :caption'). |
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127 | 127 | # |
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128 | 128 | # Other options hash entries generate additional table header tag attributes. |
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129 | 129 | # |
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130 | 130 | # Example: |
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131 | 131 | # |
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132 | 132 | # <%= sort_header_tag('id', :title => 'Sort by contact ID', :width => 40) %> |
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133 | 133 | # |
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134 | 134 | # Renders: |
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135 | 135 | # |
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136 | 136 | # <th title="Sort by contact ID" width="40"> |
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137 | 137 | # <a href="/contact/list?sort_order=desc&sort_key=id">Id</a> |
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138 | 138 | # <img alt="Sort_asc" src="/images/sort_asc.png" /> |
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139 | 139 | # </th> |
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140 | 140 | # |
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141 | 141 | def sort_header_tag(column, options = {}) |
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142 | 142 | caption = options.delete(:caption) || titleize(Inflector::humanize(column)) |
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143 | 143 | default_order = options.delete(:default_order) || 'asc' |
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144 | 144 | options[:title]= l(:label_sort_by, "\"#{caption}\"") unless options[:title] |
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145 | 145 | content_tag('th', sort_link(column, caption, default_order), options) |
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146 | 146 | end |
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147 | 147 | |
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148 | 148 | private |
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149 | 149 | |
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150 | 150 | # Return n non-breaking spaces. |
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151 | 151 | def nbsp(n) |
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152 | 152 | ' ' * n |
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153 | 153 | end |
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154 | 154 | |
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155 | 155 | # Return capitalized title. |
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156 | 156 | def titleize(title) |
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157 | 157 | title.split.map {|w| w.capitalize }.join(' ') |
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158 | 158 | end |
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159 | 159 | |
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160 | 160 | end |
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