Download Knockout Observable Pics. Observable declaration takes care of data modifications of a single object. If you need to track the previous value of an observable, it's up to you to use a subscription to capture and track it.
In this post we will take a look on computed observable in knockout.js.
We get many features like automatic ui refresh, dependency tracking of the dynamic viewmodel, bindings to bind data from the viewmodel etc. An observable property is a single value that we can get or set, and we can also subscribe to be notified when its value changes. While developing application we uses ko.observable() to declare a knockout object. I cannot use just a simple observable array because, as the documentation states an observablearray tracks which objects are in the array, not the state of those objects.