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@@ -1 +1,45 @@
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+// Mixin for linking an element and a widget instance that controls its
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+// behavior. (Storing the instance as a property of the element itself
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+// leads to memory leaks.)
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+// 
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+// Usage:
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+// 
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+// var TableWidget = Class.create(Bindable, {
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+//   initialize: function(element, options) {
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+//     this.element = $(element);
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+//     this.bindToElement();
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+//     /* ... */
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+//   }
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+// 
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+//   /* ... */  
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+// });
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+// 
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+// To retrieve an instance:
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+// 
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+// $('some_table').getInstanceOf(TableWidget);
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+
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+var Bindable = {
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+  bindToElement: function(element) {
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+    element = element || this.element;
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+    var id  = element.identify();
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+
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+    if (this.constructor._instances)
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+      this.constructor._instances = {};
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+
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+    this.constructor._instances[id] = this;
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+  }
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+};
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+
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+Element.addMethods({
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+  getInstanceOf: function(element, klass) {
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+    element = $(element);
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+    var instances = klass._instances;
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+
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+    if (instances && element.id && instances[element.id]) {
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+      return instances[element.id];
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+    } else {
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+      throw "Must call Bindable#bindToElement first."
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+    }
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+  }
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+});