knockout.js - How to add and remove extender on runtime? -

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i using extender validation in text-box accept numeric value. had referred same example shown in this link, in case have drop-down beside text-box, particular selected text of drop-down should apply binding(with extender) otherwise should apply normal binding.

for few options of dropdown, textbox should apply numeric check others should not.

i want change these 2 binding on drop-down change on run-time - 

self.textinput = ko.observable();  self.textinputnumeric = ko.observable().extend({ numeric: 0 });

check question here, on bottom there couple of edits actual code may you

move validation observable computed


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