Knockout validation Issuue

Question

function ProductViewModel()
{
var self = this;

self.Amount= ko.observable(0);

self.Quantity= ko.observable(0);
}

ko.extenders.numeric = function(target, precision) {
var result = ko.computed({
    read: target,  
    write: function(newValue) {
      var value = parseFloat(newValue,10);
      if(precision > 0){
        target(value.toFixed(precision));
      }
      else{
        target(Math.round(value));
      }
    }
});

result(target());

return result;
};

ko.applyBindings(new ProductViewModel());

Now i want to add extenders dynamically after observable is created not at a time of declaration ? I also fetching data from server and converting to observable using ko.mapping.fromJS(data) and after that i want to add extenders...so guide me guys....

Tom Studee · Answer 1 · 2013-06-07T13:06:00.663

0

Is the problem that your defined extender isn't working? It looks like you are missing a call to ko.validation.registerExtenders();

Put the above line just before you call applyBindings

edited Jun 07 '13 at 13:06

answered Jun 05 '13 at 21:29

Tom Studee

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Sorry i don't know how **ko.validation.registerExtenders()** thing works.Can you suggest something ? – Nilesh Moradiya Jun 07 '13 at 08:21
just add that line to your js under where you have the rules defined – Tom Studee Jun 07 '13 at 11:42
I'll use this and keep u posted if i need any help.Thanks tom. – Nilesh Moradiya Jun 10 '13 at 05:52

Knockout validation Issuue

1 Answers1