Observable array push multiple Objects in knockout.js

Question

Is there any option in ko, which pushes multiple elements at same time?

I have two elements which needs to be inserted into a observable array called StatesLis

Answer 1

A pushAll function has been discussed on github, see e.g. this issue or this pull request. As far as I gather it has not made it into the main code yet.

However you can easily achieve a push-all like so:

var items = ko.observableArray();

items.push.apply(items, [1, 2, 3, 4]);

as commented by stalniy in the second reference. The downside of this is that knockout will notify the subscribers after every single item pushed.

Alternatively,

function concat(the_list, items_to_concat) {
    the_list.splice.apply(the_list, [the_list().length, 0].concat(items_to_concat));
}

thus making use of the observableArray's splice implementation, as suggested by brianmhunt on the same thread.

BTW: I admit that I did not know this by heart, I simply googled "push many knockout"