Instead of registring to the change event, I'd subscribe to SelectedUserID
:
var self= this;
...
self.SelectedUserID.subscribe(function(selectedUserId) {
$.ajax({
type: "POST",
url: defaultUri + '/Home/GetUserTasks',
data: JSON.stringify({ PersonID: selectedUserId }),
contentType: "application/json; charset=utf-8",
dataType: "json",
success: function (o) {
self.SelectedUserTask(null);
self.SelectedUserTask(o);
//RRM: Added this line below so that whenever user dropdown is changed or refresh button is clicked in AssignedTo the first task of that particular user is Selected.
self.selectTask(o[0]);
}
});
});
This way it doesn't matter when or how the SelectedUserID
is being changed.