144 lines
7.1 KiB
Ruby
144 lines
7.1 KiB
Ruby
module AutoCompleteMacrosHelper
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# Adds AJAX autocomplete functionality to the text input field with the
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# DOM ID specified by +field_id+.
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#
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# This function expects that the called action returns an HTML <ul> list,
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# or nothing if no entries should be displayed for autocompletion.
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#
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# You'll probably want to turn the browser's built-in autocompletion off,
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# so be sure to include an <tt>autocomplete="off"</tt> attribute with your text
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# input field.
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#
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# The autocompleter object is assigned to a Javascript variable named <tt>field_id</tt>_auto_completer.
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# This object is useful if you for example want to trigger the auto-complete suggestions through
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# other means than user input (for that specific case, call the <tt>activate</tt> method on that object).
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#
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# Required +options+ are:
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# <tt>:url</tt>:: URL to call for autocompletion results
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# in url_for format.
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#
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# Addtional +options+ are:
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# <tt>:update</tt>:: Specifies the DOM ID of the element whose
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# innerHTML should be updated with the autocomplete
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# entries returned by the AJAX request.
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# Defaults to <tt>field_id</tt> + '_auto_complete'
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# <tt>:with</tt>:: A JavaScript expression specifying the
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# parameters for the XMLHttpRequest. This defaults
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# to 'fieldname=value'.
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# <tt>:frequency</tt>:: Determines the time to wait after the last keystroke
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# for the AJAX request to be initiated.
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# <tt>:indicator</tt>:: Specifies the DOM ID of an element which will be
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# displayed while autocomplete is running.
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# <tt>:tokens</tt>:: A string or an array of strings containing
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# separator tokens for tokenized incremental
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# autocompletion. Example: <tt>:tokens => ','</tt> would
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# allow multiple autocompletion entries, separated
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# by commas.
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# <tt>:min_chars</tt>:: The minimum number of characters that should be
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# in the input field before an Ajax call is made
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# to the server.
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# <tt>:on_hide</tt>:: A Javascript expression that is called when the
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# autocompletion div is hidden. The expression
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# should take two variables: element and update.
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# Element is a DOM element for the field, update
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# is a DOM element for the div from which the
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# innerHTML is replaced.
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# <tt>:on_show</tt>:: Like on_hide, only now the expression is called
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# then the div is shown.
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# <tt>:after_update_element</tt>:: A Javascript expression that is called when the
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# user has selected one of the proposed values.
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# The expression should take two variables: element and value.
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# Element is a DOM element for the field, value
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# is the value selected by the user.
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# <tt>:select</tt>:: Pick the class of the element from which the value for
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# insertion should be extracted. If this is not specified,
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# the entire element is used.
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# <tt>:method</tt>:: Specifies the HTTP verb to use when the autocompletion
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# request is made. Defaults to POST.
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def auto_complete_field(field_id, options = {})
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function = "var #{field_id}_auto_completer = new Ajax.Autocompleter("
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function << "'#{field_id}', "
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function << "'" + (options[:update] || "#{field_id}_auto_complete") + "', "
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function << "'#{url_for(options[:url])}'"
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js_options = {}
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js_options[:tokens] = array_or_string_for_javascript(options[:tokens]) if options[:tokens]
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js_options[:callback] = "function(element, value) { return #{options[:with]} }" if options[:with]
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js_options[:indicator] = "'#{options[:indicator]}'" if options[:indicator]
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js_options[:select] = "'#{options[:select]}'" if options[:select]
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js_options[:paramName] = "'#{options[:param_name]}'" if options[:param_name]
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js_options[:frequency] = "#{options[:frequency]}" if options[:frequency]
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js_options[:method] = "'#{options[:method].to_s}'" if options[:method]
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{ :after_update_element => :afterUpdateElement,
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:on_show => :onShow, :on_hide => :onHide, :min_chars => :minChars }.each do |k,v|
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js_options[v] = options[k] if options[k]
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end
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function << (', ' + options_for_javascript(js_options) + ')')
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javascript_tag(function)
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end
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# Use this method in your view to generate a return for the AJAX autocomplete requests.
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#
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# Example action:
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#
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# def auto_complete_for_item_title
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# @items = Item.find(:all,
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# :conditions => [ 'LOWER(description) LIKE ?',
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# '%' + request.raw_post.downcase + '%' ])
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# render :inline => "<%= auto_complete_result(@items, 'description') %>"
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# end
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#
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# The auto_complete_result can of course also be called from a view belonging to the
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# auto_complete action if you need to decorate it further.
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def auto_complete_result(entries, field, phrase = nil)
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return unless entries
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items = entries.map { |entry| content_tag("li", phrase ? highlight(entry[field], phrase) : h(entry[field])) }
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content_tag("ul", items.uniq)
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end
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# Wrapper for text_field with added AJAX autocompletion functionality.
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#
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# In your controller, you'll need to define an action called
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# auto_complete_for to respond the AJAX calls,
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#
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def text_field_with_auto_complete(object, method, tag_options = {}, completion_options = {})
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(completion_options[:skip_style] ? "" : auto_complete_stylesheet) +
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text_field(object, method, tag_options) +
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content_tag("div", "", :id => "#{object}_#{method}_auto_complete", :class => "auto_complete") +
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auto_complete_field("#{object}_#{method}", { :url => { :action => "auto_complete_for_#{object}_#{method}" } }.update(completion_options))
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end
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private
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def auto_complete_stylesheet
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content_tag('style', <<-EOT, :type => Mime::CSS)
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div.auto_complete {
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width: 350px;
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background: #fff;
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}
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div.auto_complete ul {
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border:1px solid #888;
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margin:0;
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padding:0;
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width:100%;
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list-style-type:none;
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}
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div.auto_complete ul li {
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margin:0;
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padding:3px;
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}
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div.auto_complete ul li.selected {
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background-color: #ffb;
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}
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div.auto_complete ul strong.highlight {
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color: #800;
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margin:0;
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padding:0;
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}
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EOT
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end
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end
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