1 | /** |
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2 | * JQuery extension for tagging with autocomplete. |
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3 | * @author: Jeremy Goecks |
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4 | * @require: jquery.autocomplete plugin |
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5 | */ |
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6 | // |
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7 | // Initialize "tag click functions" for tags. |
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8 | // |
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9 | function init_tag_click_function(tag_elt, click_func) { |
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10 | $(tag_elt).find('.tag-name').each( function() { |
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11 | $(this).click( function() { |
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12 | var tag_str = $(this).text(); |
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13 | var tag_name_and_value = tag_str.split(":"); |
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14 | click_func(tag_name_and_value[0], tag_name_and_value[1]); |
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15 | return true; |
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16 | }); |
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17 | }); |
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18 | } |
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19 | |
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20 | jQuery.fn.autocomplete_tagging = function(options) { |
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21 | |
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22 | var defaults = { |
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23 | get_toggle_link_text_fn: function(tags) { |
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24 | var text = ""; |
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25 | var num_tags = obj_length(tags); |
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26 | if (num_tags > 0) { |
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27 | text = num_tags + (num_tags > 1 ? " Tags" : " Tag"); |
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28 | } else { |
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29 | text = "Add tags"; |
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30 | } |
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31 | return text; |
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32 | }, |
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33 | tag_click_fn : function (name, value) {}, |
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34 | editable: true, |
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35 | input_size: 20, |
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36 | in_form: false, |
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37 | tags : {}, |
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38 | use_toggle_link: true, |
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39 | item_id: "", |
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40 | add_tag_img: "", |
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41 | add_tag_img_rollover: "", |
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42 | delete_tag_img: "", |
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43 | ajax_autocomplete_tag_url: "", |
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44 | ajax_retag_url: "", |
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45 | ajax_delete_tag_url: "", |
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46 | ajax_add_tag_url: "" |
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47 | }; |
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48 | |
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49 | var settings = jQuery.extend(defaults, options); |
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50 | |
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51 | // |
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52 | // Initalize object's elements. |
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53 | // |
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54 | |
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55 | // Get elements for this object. For this_obj, assume the last element with the id is the "this"; this is somewhat of a hack to address the problem |
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56 | // that there may be two tagging elements for a single item if there are both community and individual tags for an element. |
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57 | var this_obj = $(this); |
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58 | var tag_area = this_obj.find('.tag-area'); |
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59 | var toggle_link = this_obj.find('.toggle-link'); |
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60 | var tag_input_field = this_obj.find('.tag-input'); |
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61 | var add_tag_button = this_obj.find('.add-tag-button'); |
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62 | |
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63 | // Initialize toggle link. |
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64 | toggle_link.click( function() { |
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65 | // Take special actions depending on whether toggle is showing or hiding link. |
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66 | var after_toggle_fn; |
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67 | if (tag_area.is(":hidden")) { |
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68 | after_toggle_fn = function() { |
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69 | // If there are no tags, go right to editing mode by generating a click on the area. |
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70 | var num_tags = $(this).find('.tag-button').length; |
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71 | if (num_tags === 0) { |
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72 | tag_area.click(); |
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73 | } |
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74 | }; |
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75 | } else { |
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76 | after_toggle_fn = function() { |
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77 | tag_area.blur(); |
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78 | }; |
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79 | } |
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80 | tag_area.slideToggle("fast", after_toggle_fn); |
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81 | return $(this); |
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82 | }); |
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83 | |
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84 | // Initialize tag input field. |
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85 | if (settings.editable) { |
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86 | tag_input_field.hide(); |
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87 | } |
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88 | tag_input_field.keyup( function(e) { |
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89 | if ( e.keyCode === 27 ) { |
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90 | // Escape key |
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91 | $(this).trigger( "blur" ); |
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92 | } else if ( |
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93 | ( e.keyCode === 13 ) || // Return Key |
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94 | ( e.keyCode === 188 ) || // Comma |
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95 | ( e.keyCode === 32 ) // Space |
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96 | ) { |
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97 | // |
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98 | // Check input. |
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99 | // |
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100 | |
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101 | var new_value = this.value; |
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102 | |
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103 | // Do nothing if return key was used to autocomplete. |
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104 | if (return_key_pressed_for_autocomplete === true) { |
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105 | return_key_pressed_for_autocomplete = false; |
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106 | return false; |
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107 | } |
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108 | |
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109 | // Suppress space after a ":" |
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110 | if ( new_value.indexOf(": ", new_value.length - 2) !== -1) { |
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111 | this.value = new_value.substring(0, new_value.length-1); |
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112 | return false; |
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113 | } |
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114 | |
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115 | // Remove trigger keys from input. |
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116 | if ( (e.keyCode === 188) || (e.keyCode === 32) ) { |
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117 | new_value = new_value.substring( 0 , new_value.length - 1 ); |
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118 | } |
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119 | |
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120 | // Trim whitespace. |
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121 | new_value = $.trim(new_value); |
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122 | |
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123 | // Too short? |
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124 | if (new_value.length < 2) { |
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125 | return false; |
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126 | } |
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127 | |
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128 | // |
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129 | // New tag OK - apply it. |
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130 | // |
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131 | |
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132 | this.value = ""; // Reset text field now that tag is being added |
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133 | |
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134 | // Add button for tag after all other tag buttons. |
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135 | var new_tag_button = build_tag_button(new_value); |
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136 | var tag_buttons = tag_area.children(".tag-button"); |
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137 | if (tag_buttons.length !== 0) { |
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138 | var last_tag_button = tag_buttons.slice(tag_buttons.length-1); |
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139 | last_tag_button.after(new_tag_button); |
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140 | } else { |
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141 | tag_area.prepend(new_tag_button); |
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142 | } |
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143 | |
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144 | // Add tag to internal list. |
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145 | var tag_name_and_value = new_value.split(":"); |
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146 | settings.tags[tag_name_and_value[0]] = tag_name_and_value[1]; |
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147 | |
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148 | // Update toggle link text. |
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149 | var new_text = settings.get_toggle_link_text_fn(settings.tags); |
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150 | toggle_link.text(new_text); |
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151 | |
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152 | // Commit tag to server. |
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153 | var zz = $(this); |
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154 | $.ajax({ |
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155 | url: settings.ajax_add_tag_url, |
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156 | data: { new_tag: new_value }, |
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157 | error: function() { |
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158 | // Failed. Roll back changes and show alert. |
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159 | new_tag_button.remove(); |
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160 | delete settings.tags[tag_name_and_value[0]]; |
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161 | var new_text = settings.get_toggle_link_text_fn(settings.tags); |
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162 | toggle_link.text(new_text); |
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163 | alert( "Add tag failed" ); |
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164 | }, |
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165 | success: function() { |
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166 | // Flush autocomplete cache because it's not out of date. |
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167 | // TODO: in the future, we could remove the particular item |
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168 | // that was chosen from the cache rather than flush it. |
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169 | zz.flushCache(); |
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170 | } |
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171 | }); |
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172 | |
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173 | return false; |
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174 | } |
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175 | }); |
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176 | |
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177 | // Add autocomplete to input. |
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178 | var format_item_func = function(key, row_position, num_rows, value, search_term) { |
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179 | var tag_name_and_value = value.split(":"); |
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180 | return (tag_name_and_value.length === 1 ? tag_name_and_value[0] : tag_name_and_value[1]); |
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181 | }; |
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182 | var autocomplete_options = { selectFirst: false, formatItem: format_item_func, |
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183 | autoFill: false, highlight: false }; |
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184 | tag_input_field.autocomplete(settings.ajax_autocomplete_tag_url, autocomplete_options); |
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185 | |
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186 | |
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187 | // Initialize delete tag images for current tags. |
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188 | this_obj.find('.delete-tag-img').each(function() { |
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189 | init_delete_tag_image( $(this) ); |
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190 | }); |
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191 | |
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192 | |
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193 | // Initialize tag click function. |
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194 | init_tag_click_function($(this), settings.tag_click_fn); |
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195 | |
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196 | // Initialize "add tag" button. |
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197 | add_tag_button.click( function() { |
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198 | $(this).hide(); |
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199 | |
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200 | // Clicking on button is the same as clicking on the tag area. |
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201 | tag_area.click(); |
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202 | return false; |
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203 | }); |
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204 | |
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205 | // |
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206 | // Set up tag area interactions; these are needed only if tags are editable. |
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207 | // |
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208 | if (settings.editable) { |
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209 | // When the tag area blurs, go to "view tag" mode. |
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210 | tag_area.bind("blur", function(e) { |
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211 | if (obj_length(settings.tags) > 0) { |
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212 | add_tag_button.show(); |
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213 | tag_input_field.hide(); |
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214 | tag_area.removeClass("active-tag-area"); |
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215 | tag_area.addClass("tooltip"); |
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216 | } else { |
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217 | // No tags, so do nothing to ensure that input is still visible. |
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218 | } |
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219 | }); |
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220 | |
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221 | // On click, enable user to add tags. |
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222 | tag_area.click( function(e) { |
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223 | var is_active = $(this).hasClass("active-tag-area"); |
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224 | |
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225 | // If a "delete image" object was pressed and area is inactive, do nothing. |
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226 | if ($(e.target).hasClass("delete-tag-img") && !is_active) { |
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227 | return false; |
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228 | } |
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229 | |
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230 | // If a "tag name" object was pressed and area is inactive, do nothing. |
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231 | if ($(e.target).hasClass("tag-name") && !is_active) { |
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232 | return false; |
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233 | } |
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234 | |
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235 | // Remove tooltip. |
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236 | $(this).removeClass("tooltip"); |
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237 | |
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238 | // Hide add tag button, show tag_input field. Change background to show |
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239 | // area is active. |
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240 | $(this).addClass("active-tag-area"); |
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241 | add_tag_button.hide(); |
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242 | tag_input_field.show(); |
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243 | tag_input_field.focus(); |
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244 | |
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245 | // Add handler to document that will call blur when the tag area is blurred; |
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246 | // a tag area is blurred when a user clicks on an element outside the area. |
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247 | var handle_document_click = function(e) { |
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248 | var check_click = function(tag_area, target) { |
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249 | var tag_area_id = tag_area.attr("id"); |
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250 | // Blur the tag area if the element clicked on is not in the tag area. |
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251 | if (target !== tag_area) { |
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252 | tag_area.blur(); |
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253 | $(window).unbind("click.tagging_blur"); |
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254 | $(this).addClass("tooltip"); |
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255 | } |
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256 | }; |
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257 | check_click(tag_area, $(e.target)); |
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258 | }; |
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259 | // TODO: we should attach the click handler to all frames in order to capture |
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260 | // clicks outside the frame that this element is in. |
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261 | //window.parent.document.onclick = handle_document_click; |
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262 | //var temp = $(window.parent.document.body).contents().find("iframe").html(); |
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263 | //alert(temp); |
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264 | //$(document).parent().click(handle_document_click); |
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265 | $(window).bind("click.tagging_blur", handle_document_click); |
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266 | |
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267 | return false; |
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268 | }); |
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269 | } |
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270 | |
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271 | // If using toggle link, hide the tag area. Otherwise, show the tag area. |
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272 | if (settings.use_toggle_link) { |
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273 | tag_area.hide(); |
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274 | } |
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275 | |
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276 | // |
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277 | // Helper functions. |
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278 | // |
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279 | |
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280 | // |
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281 | // Collapse tag name + value into a single string. |
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282 | // |
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283 | function build_tag_str(tag_name, tag_value) { |
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284 | return tag_name + ( tag_value ? ":" + tag_value : ""); |
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285 | } |
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286 | |
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287 | |
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288 | // Initialize a "delete tag image": when click, delete tag from UI and send delete request to server. |
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289 | function init_delete_tag_image(delete_img) { |
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290 | $(delete_img).mouseenter( function () { |
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291 | $(this).attr("src", settings.delete_tag_img_rollover); |
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292 | }); |
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293 | $(delete_img).mouseleave( function () { |
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294 | $(this).attr("src", settings.delete_tag_img); |
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295 | }); |
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296 | $(delete_img).click( function () { |
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297 | // Tag button is image's parent. |
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298 | var tag_button = $(this).parent(); |
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299 | |
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300 | // Get tag name, value. |
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301 | var tag_name_elt = tag_button.find(".tag-name").eq(0); |
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302 | var tag_str = tag_name_elt.text(); |
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303 | var tag_name_and_value = tag_str.split(":"); |
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304 | var tag_name = tag_name_and_value[0]; |
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305 | var tag_value = tag_name_and_value[1]; |
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306 | |
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307 | var prev_button = tag_button.prev(); |
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308 | tag_button.remove(); |
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309 | |
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310 | // Remove tag from local list for consistency. |
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311 | delete settings.tags[tag_name]; |
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312 | |
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313 | // Update toggle link text. |
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314 | var new_text = settings.get_toggle_link_text_fn(settings.tags); |
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315 | toggle_link.text(new_text); |
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316 | |
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317 | // Delete tag. |
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318 | $.ajax({ |
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319 | url: settings.ajax_delete_tag_url, |
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320 | data: { tag_name: tag_name }, |
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321 | error: function() { |
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322 | // Failed. Roll back changes and show alert. |
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323 | settings.tags[tag_name] = tag_value; |
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324 | if (prev_button.hasClass("tag-button")) { |
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325 | prev_button.after(tag_button); |
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326 | } else { |
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327 | tag_area.prepend(tag_button); |
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328 | } |
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329 | alert( "Remove tag failed" ); |
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330 | |
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331 | toggle_link.text(settings.get_toggle_link_text_fn(settings.tags)); |
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332 | |
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333 | // TODO: no idea why it's necessary to set this up again. |
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334 | delete_img.mouseenter( function () { |
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335 | $(this).attr("src", settings.delete_tag_img_rollover); |
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336 | }); |
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337 | delete_img.mouseleave( function () { |
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338 | $(this).attr("src", settings.delete_tag_img); |
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339 | }); |
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340 | }, |
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341 | success: function() {} |
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342 | }); |
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343 | |
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344 | return true; |
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345 | }); |
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346 | } |
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347 | |
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348 | // |
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349 | // Function that builds a tag button. |
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350 | // |
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351 | function build_tag_button(tag_str) { |
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352 | // Build "delete tag" image. |
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353 | var delete_img = $("<img/>").attr("src", settings.delete_tag_img).addClass("delete-tag-img"); |
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354 | init_delete_tag_image(delete_img); |
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355 | |
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356 | // Build tag button. |
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357 | var tag_name_elt = $("<span>").text(tag_str).addClass("tag-name"); |
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358 | tag_name_elt.click( function() { |
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359 | var tag_name_and_value = tag_str.split(":"); |
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360 | settings.tag_click_fn(tag_name_and_value[0], tag_name_and_value[1]); |
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361 | return true; |
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362 | }); |
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363 | |
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364 | var tag_button = $("<span></span>").addClass("tag-button"); |
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365 | tag_button.append(tag_name_elt); |
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366 | // Allow delete only if element is editable. |
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367 | if (settings.editable) { |
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368 | tag_button.append(delete_img); |
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369 | } |
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370 | |
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371 | return tag_button; |
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372 | } |
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373 | |
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374 | }; |
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