When to use ko.utils.unwrapObservable?

by

You should use ko.utils.unwrapObservable in cases where you don’t know if you have been given an observable or not. This would commonly be in a custom binding where an observable or non-observable could be bound against it.

In the code that you have above, the call to valueAccessor() is not actually unwrapping an observable. It is just retrieving the value that was passed to the binding in the correct context (it gets wrapped in a function to protect it). The return value of valueAccessor() may be an observable or not. It is whatever was passed to the binding.

More Related Contents:

  1. Difference between knockout View Models declared as object literals vs functions
  2. Resolve circular references from JSON object
  3. How to create an auto-complete combobox?
  4. Knockout.js incredibly slow under semi-large datasets
  5. Change observable but don’t notify subscribers in knockout.js
  6. knockout data-bind on dynamically generated elements
  7. Setting value of Observable not updating in Knockout
  8. How to clear/remove observable bindings in Knockout.js?
  9. make an input only-numeric type on knockout
  10. Knockout + Bootstrap 3 Radio Buttons
  11. Binding true / false to radio buttons in Knockout JS
  12. combine dynamic and static classes through css binding, knockout.js
  13. Knockout JS – How to correctly bind an observableArray
  14. Javascript Equivalent to C# LINQ Select
  15. knockout.js using $index with if binding
  16. Knockout JS mapping plugin without initial data / empty form
  17. How to detect page zoom level in all modern browsers?
  18. How to validate date with format “mm/dd/yyyy” in JavaScript?
  19. Replacing css file on the fly (and apply the new style to the page)
  20. How to find if an array contains a specific string in JavaScript/jQuery?
  21. How to limit google autocomplete results to City and Country only
  22. Check if element is visible on screen [duplicate]
  23. Capturing TAB key in text box [closed]
  24. Programmatically play video with sound on Safari and Mobile Chrome
  25. addEventListener on NodeList [duplicate]
  26. jquery : $().animate() is not a function
  27. Check if polygon is inside a polygon
  28. Save data in a special order when click on button
  29. Firefox extension custom fonts
  30. How to disable mouseout events triggered by child elements?

Leave a Comment