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- - ko.computed does not update (http://www.codingforums.com/showthread.php?t=286878)

nikos101

02-01-2013 03:50 PM

ko.computed does not update

How come the followButtonText doesn't update then isFollowing is changed?

Code:

     function AppViewModel() {



                this.toggleIsFollowing = function () {

                    this.isFollowing = !this.isFollowing

                };



                this.isFollowing = ko.observable(false);

                this.followButtonText = ko.computed(function () {

                    return this.isFollowing ? "Unfollow" : "Follow";

                });

            }



            ko.applyBindings(new AppViewModel());

Dormilich

02-02-2013 11:43 AM

there is not enough information (esp. about the ko instance) to say anything definite. it might be a scope issue, it might be that the methods do not do what you expect …

nikos101

02-02-2013 12:49 PM

this is all the code for KO in this app

Code:

<script type="text/javascript">

        $(document).ready(function () {





            function AppViewModel() {



                this.toggleIsFollowing = function () {

                    this.isFollowing = !this.isFollowing;

                    follow();

                };



                this.isFollowing = ko.observable(false);

                this.followButtonText = ko.computed(function () {

                    return this.isFollowing ? "Unfollow" : "Follow";

                });

            }



            ko.applyBindings(new AppViewModel());



        });

    </script>

and HTML element using that text:

Code:

<button class="radius secondary button" data-bind="text: followButtonText,click: toggleIsFollowing"></button>

Dormilich

02-02-2013 12:54 PM

Quote:

Code:

this.isFollowing = ko.observable(@Model.IsFollowing.ToString().ToLower());

which language is that? and what part thereof is JS?

if the posted code is everything and ko is supposedly a JS object, you will get a TypeError (ko is null or not an object).

nikos101

02-02-2013 12:55 PM

sorry that gets compiled to false serverside, its Razor asp mvc syntax

Dormilich

02-02-2013 12:58 PM

well, the question about the ko variable remains.

nikos101

02-02-2013 01:30 PM

sorry I don't get what you mean by ko var.

I just use it like this site:
http://learn.knockoutjs.com/#/?tutorial=intro

Dormilich

02-02-2013 01:37 PM

aah, now it makes way more sense.

nikos101

02-02-2013 01:53 PM

1000sandth post!"!!!!!! :)

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