Question

So basically I wan’t to get data from server at start and then update it every 2 minutes, but instead it gets first value only after 2 minutes, what can I do about this?

Here is my js markup:

var itemViewModel = {
    item: ko.observable().extend({ throttle: 120000 }),
    loadcontent: function (getID) {
        $.ajax({
            url: '/api/item/details/' + getID,
            dataType: 'json',
            success: function (data) {
                itemViewModel.item(data);
            }
        });
    }
};

Maybe this will help, here is a HTML markup:

<div id="item-details-content">
    <input type="hidden" id="item-id" value="@id" data-bind=""/>
    <div class="item-list" data-bind="init: itemPage.loadcontent(@id), with: itemPage.item">

Conditions

1. There need to be and initial call of loadcontent
2. Everything must be inside viewModel

Answer 1

That’s not what the throttle extender (link) is meant for. Use setInterval (link) instead.

throttle is meant to handle a scenario where you may receive an arbitrary amount of events in a short timespan and you do not want to act upon every single event. E.g. you have a search field with autocomplete functionality that uses a REST-API. You do not want to call the REST-API every single time a user pushes a key. Rather, you’d like to wait a bit until the user is done typing. This is a perfect use case for throttle.

What you are looking for is a way to repeat an action on a predetermined interval. JavaScript has a builtin function just for that and it’s called setInterval.

var itemViewModel = {
    item: ko.observable().extend({ throttle: 120000 }),
    loadcontent: function (getID) {
        var loadData = function()
        {
            $.ajax({
                url: '/api/item/details/' + getID,
                dataType: 'json',
                success: function (data) {
                    itemViewModel.item(data);
                }
            });
        }
        loadData(); // initial call
        setInterval(loadData, 120000); // repeat every 2 minutes
    }
};