I know this is an old thread, but I was having the same problem and found out a much better solution that was probably added to knockout after this question was officially answered, so I’ll just leave it for people with the same problem. Currently there is no need for extenders, custom binding handlers or … Read more
Is better to create custom binding http://knockoutjs.com/documentation/custom-bindings.html which accept only allowed characters [0-9,.] as numeric representation. put this line into your view <input id=”text” type=”text” data-bind=”numeric, value: number”> put this line into your model (remember to bind number as observable property) ko.bindingHandlers.numeric = { init: function (element, valueAccessor) { $(element).on(“keydown”, function (event) { // Allow: … Read more