Updating Knockout.js Observable array element value

Question

I need to update an observable array element value. The observable array is a collection of class objects. First I need to find out matching object by id and update some other p

Answer 1

That's pretty simple with knockout:

// We're looking for the Seat with this No 
var targetNo = 2;

// Search for the seat -> arrayFirst iterates over the array and returns the
// first item that is a match (= callback returns "true")!
var seat = ko.utils.arrayFirst(this.seats(), function(currentSeat) {
    return currentSeat.No() == targetNo; // <-- is this the desired seat?
});

// Seat found?
if (seat) {
    // Update the "Booked" property of this seat!
    seat.Booked(true);
}

http://jsfiddle.net/2NMJX/4/

Answer 2

viewModel.seats()[self.No()].Booked(true);