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  1. ko.observable.fn.beforeAndAfterSubscribe = function (callback, target) {
  2.     var _oldValue;
  3.     this.subscribe(function (oldValue) {
  4.         _oldValue = oldValue;
  5.     }, null, 'beforeChange');
  6.  
  7.     this.subscribe(function (newValue) {
  8.         callback.call(target, _oldValue, newValue);
  9.     });
  10. };
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https://ideone.com/NPpNcB
language:
JavaScript (rhino 1.7.9)
created:
12 years ago
visibility:
public

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