i read many tutorials but i dont know how to do this, this is the input
input(type="text",name="price",id="price"data-bind="text: price,valueUpdate:['afterkeydown','propertychange','input']")
and this is my viewModel
price: ko.computed(function()
{
return parseFloat(this.replace(' ','').replace(/[^0-9\.]+/g,"")) || '';
},this)
but this cause error: this has no method replace??? how can i pass the price value to the computed function??
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: backspace, delete, tab, escape, and enter
if (event.keyCode == 46 || event.keyCode == 8 || event.keyCode == 9 || event.keyCode == 27 || event.keyCode == 13 ||
// Allow: Ctrl+A
(event.keyCode == 65 && event.ctrlKey === true) ||
// Allow: . ,
(event.keyCode == 188 || event.keyCode == 190 || event.keyCode == 110) ||
// Allow: home, end, left, right
(event.keyCode >= 35 && event.keyCode <= 39)) {
// let it happen, don't do anything
return;
}
else {
// Ensure that it is a number and stop the keypress
if (event.shiftKey || (event.keyCode < 48 || event.keyCode > 57) && (event.keyCode < 96 || event.keyCode > 105)) {
event.preventDefault();
}
}
});
}
};