manifold/js/plugin.js

   1 // INHERITANCE
   2 // http://alexsexton.com/blog/2010/02/using-inheritance-patterns-to-organize-large-jquery-applications/
   3 // We will use John Resig's proposal
   4
   5 // http://pastie.org/517177
   6
   7 // NOTE: missing a destroy function
   8
   9 $.plugin = function(name, object) {
  10     $.fn[name] = function(options) {
  11         var args = Array.prototype.slice.call(arguments, 1);
  12         return this.each(function() {
  13             var instance = $.data(this, name);
  14             if (instance) {
  15                 instance[options].apply(instance, args);
  16             } else {
  17                 instance = $.data(this, name, new object(options, this));
  18             }
  19         });
  20     };
  21 };
  22
  23 var Plugin = Class.extend({
  24
  25     init: function(options, element)
  26     {
  27         // Mix in the passed in options with the default options
  28         this.options = $.extend({}, this.default_options, options);
  29
  30         // Save the element reference, both as a jQuery
  31         // reference and a normal reference
  32         this.element  = element;
  33         this.$element = $(element);
  34
  35         // return this so we can chain/use the bridge with less code.
  36         return this;
  37     },
  38
  39     has_query_handler: function() {
  40         return (typeof this.on_filter_added === 'function');
  41     },
  42
  43     _query_handler: function(e, event_type, data)
  44     {
  45         // We suppose this.query_handler_prefix has been defined if this
  46         // callback is triggered
  47         var fn;
  48         switch(event_type) {
  49             case FILTER_ADDED:
  50                 fn = 'filter_added';
  51                 break;
  52             case FILTER_REMOVED:
  53                 fn = 'filter_removed';
  54                 break;
  55             case CLEAR_FILTERS:
  56                 fn = 'filter_clear';
  57                 break;
  58             case FIELD_ADDED:
  59                 fn = 'field_added';
  60                 break;
  61             case FIELD_REMOVED:
  62                 fn = 'field_removed';
  63                 break;
  64             case CLEAR_FIELDS:
  65                 fn = 'field_clear';
  66                 break;
  67             default:
  68                 return;
  69         } // switch
  70
  71         fn = 'on_' + this.query_handler_prefix + fn;
  72         if (typeof this[fn] === 'function') {
  73             // call with data as parameter
  74             // XXX implement anti loop
  75             this[fn](data);
  76         }
  77     },
  78
  79     listen_query: function(query_uuid, prefix) {
  80         this.query_handler_prefix = (typeof prefix === 'undefined') ? '' : (prefix + '_');
  81         this.$element.on(manifold.get_query_channel(query_uuid), $.proxy(this._query_handler, this));
  82     },
  83
  84     default_options: {},
  85
  86     speak: function(msg){
  87         // You have direct access to the associated and cached jQuery element
  88         this.$element.append('<p>'+msg+'</p>');
  89     },
  90
  91     register: function() {
  92         // Registers the plugin to jQuery
  93     },
  94
  95 });