Site Meter

Knockout 3.2.0 released

This one has been slow-cooking since February and it’s good. For the first time in a while, this release focuses on adding some significant new features to Knockout. Almost any developer using KO should seriously consider making use of these, as they can greatly streamline your code.

So what’s new?


Components bring a new and hugely more scalable way of structuring a large application. They:

  • Combine a viewmodel and template in an encapsulated package
  • Can represent either small reusable widgets or entire sections/pages in a larger app
  • Can be preloaded, or loaded on demand
  • Can be nested or inherited
  • Can work with custom conventions for configuration or loading.

I’ve built a few apps with KO components recently (including the KO triage site, and an iOS/Android game called Blockpick (not open source)) and can confidently say this is how I’ll be structuring my KO apps from now on.

See: components overview documentation and explore from there. Or if you’re in the mood to get a hot drink and settle in for a demo, see this video from NDC Oslo 2014.

Custom elements

Custom elements provide many of the benefits of the emerging Web Components spec, but cleanly integrated with KO’s new components feature described above. Plus, they’re ready to use in production today – compatible all the way back to IE6!

See: custom elements documentation

Pure computeds

ko.computed has always been the powerhouse behind KO, underpinning just about all of its features. It makes your code reactive without you having to declare any dependencies explicitly.

ko.pureComputed is a new specialisation of ko.computed with better performance and memory management in many cases. It automatically pauses/resumes evalution, and automatically releases/reclaims references to dependencies, according to whether any other part of your app is watching it at the time. This can be extremely valuable for large single-page applications, where you may be tearing down and rebuilding different parts of your UI over long periods of time, and need to ensure your memory/CPU use is as streamlined as possible.

See: pure computed documentation

The textInput binding

This new binding transparently resolves numerious browser event quirks related to text entry. You might not believe how many different types of events are raised (or worse: not raised) by different browsers when a user types, cuts, pastes, drags, or autocompletes text in an <input> or <textarea>. Or if you’ve been a web developer for a while, you probably would believe it, and have the battle scars to show.

Well, textInput is something of an expert on the subject, so hopefully you don’t have to be.

See: textInput documentation


Of course, there are smaller bugfixes in there too. You can find the exact set of changes on GitHub.

Hopefully these enhancements will prove valuable for your projects. I’ve been using most of them for a while and have certainly found them useful. Big thanks to everyone who’s participated in implementing and discussing these changes!

91 Responses to Knockout 3.2.0 released

  1. Kim Tranjan

    Amazing! You guys are awesome, thank you very much.

  2. Thanks Steve! This is the best KO ever.

  3. Igor Blinnikov

    Hi, Steve.

    With introducing the new observable type “pureComputed” do we still need the old “computed” counterpart? What is the difference between them except performance? When should I use pureComputed and when just computed?


  4. Daniel

    Hmm… for some reason, cloning from only retrieves the “deploy” branch.
    Is that on purpose?

  5. Daniel

    I switched to “master” branch and I got the entire repository.

  6. Kudos to the entire team! It’s great to see you guys are still improving KO in a sensible way and are so focused on browser compat.

  7. Puneet

    Fantastic to find that Knockout still evolving. It must still be the best performing JavaScript MVVM lib out there.

    Checked out master branch of, switched to master. But npm install is giving errors while installing some components like graceful-fs. Do I need to run a particular version of node? I am running 0.11.13

  8. Fredrik

    Great news! Looking forward to trying out directives.

    By the way, I’ve just started using Angular on a big project after having used Knockout on a previous one. And I find that Knockout really does fill another space than Angular, really liking KO’s expressiveness.

  9. HMR

    This is awesome. I’m excited to use the new features. When will the nuget package be updated to 3.2?

  10. Excellent. I am a fan of web components and its great that knockout.js is jumping on the wagon. It is unfortunate that knockout.js is not getting its due press-time compared to Angular.js (bloated- all things to eveyone) and Ember.js (Ogre-like where you have to do in a certain way or else the world will implode)

  11. Great work guys. I am gonna use new features soon.

  12. It’s perfect time to make some plans for the future
    and it is time
    to be happy. I’ve read this post and if I could I desire to suggest you few interesting things or suggestions.
    Maybe you can write next articles referring to this article.
    I desire to read even more things about it!|
    It’s appropriate
    time to make some plans for the long run and it is time to be happy.
    I’ve read this submit and if I may just I wish to
    suggest you few
    attention-grabbing issues or
    suggestions. Maybe you can write
    subsequent articles referring to this article.

  13. Mike

    Good job!
    Any breaking changes to the prev. version?

  14. Lucas

    Hey man, great work on knockout 3.2.0, very cool the components feature, a lot of stuff can be done with that, already using it since beta :D

    A quick question: whats the stack you are using in your game? I ve been searching a lot ways to develop mobile applications using html5/phonegap, but all those frameworks dont seem to fit nice with knockout.

  15. An outstanding share! I’ve just forwarded this onto a friend who was
    doing a little homework on this. Andd he in fact otdered me breakfast sikmply because I found it for him…
    lol. So let me reword this…. Thank YOU for the meal!! But yeah,
    thaanx for spending the time tto discuss this subject here on your web page.

    my web site; boost 3 mobile broadband

  16. Thanks for sharing your thoughts. I truly appreciate your efforts andd
    I am waiting for your further post thanks once again.

    my webpave … verizon Anthem

  17. Attracyive section of content. I just stumbled upon your websiye and in accessdion capital too assert tha I get actually enjoyed account your blog posts.
    Anyway I’ll be subscribing to your feeds and even I achievement you access consistently quickly.

    My website: at&t 10 international connect plus (Danny)

  18. Pingback: Knockout.js 3.2.0 正式发布,JavaScript 的 UI 库 | 我爱互联网

  19. Baljeet Sandhu

    This is great! KO is the best combo of power and simplicity.

  20. Hi, I do think this is a great site. I stumbledupon it ;)
    I may revisit yet again since i have bookmarked it.
    Money and freedom is the best way to change,
    may you be rich annd continue to guide others.

    My page … iphone 3 verizon

  21. Justin

    A nice release, but this doesn’t appear to use or support real W3C custom elements.

    Are there any plans to produce real custom elements from Knockout components?

  22. I read this article completely about thhe comparison of hottest and previous technologies,
    it’s amazing article.

    My webpage ::boost mobile back to school sale

  23. You ought to takee part in a contest for one oof the best websites on the web.
    I am going to recommend this website!

    Have a look aat my web-site :: boost mobile unlocked phones;

  24. Very rapidly tjis web site will be famous amid all bloggng people, due to it’s plewsant articles or

    Also visit mmy web page: at&t unlimited (Latanya)

  25. I read a lot of interesting content here. Probably you spend a lot of time writing, i know how to save you a lot of work, there is an online tool that creates high
    quality, google friendly articles in minutes, just search in google – laranitas free content source

  26. I used to be able to find good info from yur articles.

    my blog boost mobile online promo Codes

  27. Congratulations and thanks for version 3.2 of Knockout. The KO Components feature is just a great addition to Knockout. This one feature that will make web app development with Knockout so much more streamlined.

  28. Hi, every time i ued to check webpage posts here in the early hours
    in the break of day, as i enjoy to gain knowledge of more and

    Look into my web blog; Boost Mobile 40 Unlimited Plan

  29. I think this is among the most vital nfo for me. And i am glad reading
    your article. But wanna remark on some general things, The website style
    is perfect, the articles is really excellent : D.
    Goood job, cheers

    Review my web site boost mobile kitkat update

  30. stickyfeet

    Knockout was great, now it’s sublime! Using Knockout components / custom elements, I was able to finally come up with a really elegant solution for sticky page footers:

    Great work! :)

  31. Born2code

    I have the same question as Lucas. I know blockpick is not open source but can you advice on the choice of stack? did you use phonegap?
    much appreciated (and all the other awesome work on knockout, we use it extensively)

  32. It’s going to bbe finish of mine day, however before finish
    I am reading this great article tto increase my experience.

    Feel free to visit my weblog; boost mobile 1800 Number customer care (

  33. Awesome! Its inn fact amazing post, I hqve got much clear idea regarding from
    this piesce of writing.

    Look at my web page … blackberry q10 verizon

  34. It is in reality a nice and usseful piece of information. I am
    satisfied that you shared this useful info with us. Please keep us up to
    date ike this. Thanks for sharing.

    Feeel free to surf to my webpage – verizon n9510

  35. I think the admin of thiis sjte is truly working ard in support of his website, as here every stuff is quality based stuff.

    Visit my web blog: verizon 2.5 gb cap

  36. I amm regular visitor, how are yoou everybody? This article posted at this web site is
    in fact fastidious.

    My homepage; galaxy prevail 2 boosst mobile (Florian)

  37. Hi, i feel that i saw you visited my webpog so
    i came to return the choose?.I am tryng to find issues to enhance my site!I assume its adequate to make use of a
    few of your ideas!!

    my web site :: verizon at walmart (Ernestine)

  38. I’m extrremely pleased to umcover this site.
    I wanterd too thank you for your time just for thbis wonderful read!!
    I definitely really liked every little bit of it annd i
    also have you saved ass a favorite to look at new things on your site.

    Here is my web site … at&t 35 dollar plan

  39. “Organizations such as MKP, and other forward looking communities representing various spiritual tribes, have
    a contribution to make,” he said. We find mention of Kur in three myths from the
    4th – 3rd Millennium B. On the other hand, the person may not
    mention Draconian Wicca, which I have recently read about myself.

  40. i agree mitchell nice one

  41. new samsung chromebook review

    It is conceivable that they’re going to discover some syntax
    issues or some more plans to enhance your paper. After all, no-one is gonna identify using a character or a
    setting without knowing what it, he, or she looks like.
    article costco photo Once
    you’ve created your, your article creation and submission can begin. Write articles about topics which could actually appear about the

  42. So verschrieen das Spielen auch dargestellt wird, so steht ja glücklicherweise fest, dass
    zocken, ein dem Alter des Gamers angemessenes Spiel vorausgesetzt, förderlich
    für den Geist des Spielenden ist. Beim
    Daddeln von Games lernt der Spielende mit Spaß und ohne den Druck Konsequenzen tragen zu
    müssen in erhöhter Frequenz Urteile zu fällen und
    seine Aktionen und Reaktionen zu priorisieren. Die meisten Computerspiele vermitteln zusätzlich
    auch noch Kenntnisse über das Haushalten mit Rohstoffen und fördern logisches
    Denken. Selbst die verschrieen Multiplayer Spiele
    können doch häufig den vorgeschobenen Effekt des Abdriftens in eine
    virtuelle Realität} invertieren. Der Gamer mag wohl auch vielen Freaks begegnen, doch findet der Spieler
    häufig exakt in seinem Favoriten Gleichgesinnte.
    Im Endeffekt: zocken ist genial! Ungeachtet des Spiels und
    ob PC,Konsole,Handy,etc. , Spielen ist ein Kulturgut.

  43. It is a great feeling watching just about
    each and every one of your sports picks win. Bookies or bettors can get information about the fitness of the players by searching
    online through some fitness related Web sites or news web sites.

    I could have won more it just depends on how much you”.

  44. Why users sill use to read news papers when in this
    technological world everything is available on net?

    My web site :: cp codes

  45. I delight in, cause I discovered exactly what I used to be having a look for.
    You’ve ended my four day lengthy hunt! God Bless you man. Have a great day.

  46. Thanks for some other informative website.
    The place else may just I get that type of info written in such a perfect
    way? I’ve a mission that I am simply now working on, and I have been at the glance out for such

  47. Hi every one, here every one is sharing such experience, so
    it’s nice to read this web site, and I used
    to visit this webpage every day.

  48. I am not sure where you’re getting your info, but great topic.
    I needs to spend some time learning much more or understanding more.
    Thanks for great info I was looking for this information for my mission.

  49. Unquestionably believe that which you said. Your favorite justification appeared
    to be on the web the easiest thing to be aware of. I say to
    you, I definitely get annoyed while people think
    about worries that they just don’t know about.
    You managed to hit the nail upon the top as well as defined out the whole thing without having side-effects ,
    people could take a signal. Will probably be back to get more.

    my homepage: athletic greens testimonials

  50. My partner and I stumbled over here coming
    from a different web page and thought I might check things out.
    I like what I see so now i’m following you.
    Look forward to exploring your web page again.

    Review my webpage; seo company toronto

  51. It is reaply a great and useful piece of info. I’m happy that yoou shared this helpful info with us.
    Please keep us informed like this. Thank you ffor sharing.

    Feel free to visit my blog post … athletic training jobs in greenville nc

  52. Very good article! We are linking to this great content on our website.

    Keep up the great writing.

  53. In a similar sense, companies would be wise to present their workers something to
    unite under. The truth is, people join MLM opportunities as a consequence of who introduced them.
    ” Employees at Nike are encouraged to be curious and offered to new ideas, whatever their source.

    Feel free to visit my blog ::

  54. Have you ever experienced running out of medicines and you’re having a really
    busy day. Dealing with ADHD is a family project that includes the parents and all of the siblings.

    A Pharm – D is not a Ph – D but more akin to an MD or DDS.

  55. What i do not realize is if truth be told how you are not actually
    a lot more neatly-liked than you might be now. You’re very intelligent.
    You know thus considerably relating to this subject, produced
    me individually believe it from a lot of various angles.

    Its like women and men are not fascinated until it is one thing to do with Girl gaga!
    Your personal stuffs great. At all times care for it up!

  56. You’re so interesting! I don’t suppose I’ve truly
    read through anything like this before. So great to discover someone with
    some unique thoughts on this subject. Really.. many thanks for starting this up.
    This web site is one thing that is needed on the internet, someone with some originality!

    Visit my page … toenail nail fungus

  57. Thanks for sharing your info. I really appreciate your efforts and I will
    be waiting for your further write ups thank you once again.

  58. Yes! Finally someone writes about healthoest foods tto eat late at night.

    Look at my website :: precision nutrition shakes pdf

  59. Might I inquire if you’ll be alright with fee based blog posts?

    All I’d want is for you to create articles material on behalf
    of me and simply a back link or mention of my web-site. I am going to compensate you.

  60. The variety of nuclei people have of their muscle cells directly influences their functionality to recuperate after training.
    Right here’s an in depth testimonial of the program.
    The MI40X fitness physique program is right for people who really wish
    to attain the utmost muscle gain and fat loss over a six-week period by way of a strong 6 days weekly exercise schedule.

  61. Aw, this was an incredibly good post. Spending some time and actual effort to produce
    a very good article… but what can I say… I hesitate a lot and never seem to get nearly anything done.

  62. I every time spent my half an hour to read this website’s posts every day along with a
    mug of coffee.

  63. Replace Wiper Blades RegularlyLeading wiper blade manufacturers Trico and ACDelco both recommend windshield wiper blades isn’t difficult and almost anyone can appliance repair in san diego
    make this a simple DIY project. However, it appliance repair in san diego is
    always best to pay for your auto glasses.

  64. I read this paragraph completely regarding the difference of hottest and earlier technologies, it’s remarkable article.

    Stop by my web blog tandem kayak trailer with storage

  65. Valuable info. Fortunate me I discovered your web site unintentionally,
    and I am stunned why this twist of fate did not took place earlier!
    I bookmarked it.

  66. rca to hdmi converter best buy

    Short Paragraphs – Aim to help keep your paragraphs
    under 50 words (MAX). I think you need to use whatever is best suited for you
    if you find that you just ideas flow better by
    writing before typing – choose it. Rca connector to hdmi
    thought;, How in the event
    you convince your parents to buy a new toy in your case.
    You wish to submit the crooks to article directories like Ezinearticles.

  67. It appears to me that this folks crying relating sofabed include the folks who’ve been unable to
    perform what it takes. Some are even available as part of your
    full suite range with matching fixed sofas and chairs.

    There is more to this sofa than simply the name that is why it really is in high demand available
    in the market.

    Another thing you needs to be worried about before
    investing in a sofa is its size. Fabric that is used to
    pay for sofa is an important factor inside the comfort of sofa.

    With research papers it is advisable to possess lots of genuine
    thoughts to add. Now, here would be the 3 quick, easy solutions to make money through the Internet:.
    describe ( sectional sleeper sofa north carolina Prior towards the writing process, our writers proceed through different
    texts ensuring that this content they write relates towards the topic.
    Quill Brothers Calligraphy is committed to providing the most effective possible work for his or her clients.

  68. Remarkable! Its actually awesome post, I have got much clear idea regarding from this paragraph.

  69. Good day! This is kind of off topic but I need some advice from an established blog.

    Is it difficult to set up your own blog?
    I’m not very techincal but I can figure things out pretty fast.
    I’m thinking about setting up my own but I’m not sure
    where to start. Do you have any points or suggestions? Thank you

  70. All five of them qualifying for the knockout stage by finishing
    first in their groups except Chile which was second in group H.

    Most goals aren’t the Goalie’s fault – if defenders did a great job
    the ball would not get to the Goalie. All the things that make real life flying interesting are
    available as you have the choice to perform real life emergencies including
    instrument and multiple system failures.

  71. If you’re looking for any program serial keys or free downloads for
    programs that cost money then head over to Jakes Free bots and
    program keys at

  72. Excellent blog right here! Additionally your web site rather a lot up
    fast! What web host are you using? Can I get your associate hyperlink for your host?
    I desire my site loaded up as quickly as yours lol

  73. I know this if off topic but I’m looking into starting my own blog and was curious
    what all is required to get setup? I’m assuming having a blog like yours would
    cost a pretty penny? I’m not very web smart so I’m not 100% sure.
    Any tips or advice would be greatly appreciated.


  74. Do you have any video of that? I’d love to find out some additional information.

  75. I am regular reader, how are you everybody?
    This paragraph posted at this web page is
    genuinely pleasant.

  76. Howdy I am so thrilled I found your webpage, I really found you by mistake, while I was browsing on Aol for something else, Anyhow I am here now
    and would just like to say kudos for a fantastic post and a
    all round entertaining blog (I also love the theme/design), I
    don’t have time to go through it all at the minute but I have bookmarked
    it and also added in your RSS feeds, so when I have time I will
    be back to read much more, Please do keep up the great job.

  77. Men who are alpha males generate their power from their inner strength,
    their life experiences, and their character. , I suggest trying them out in order to find out if they really
    work or not. This courtyard also divided the back yard from the garage so that we could come and go
    without the dog escaping the yard when the electric garage door was opened.

  78. I’d always wish to be updated on new articles on this site, saved them to my

  79. magnificent points altogether, you simply received a logo new
    reader. What might you suggest in regards to your post that you made a few days ago?

    Any certain?

  80. Another benefit is you’ll be able to contact 911 services by transmitting a unique code via your keypad.
    This is fast, clear and effective nevertheless for that, you will need the proper device that could serve the
    need. Baofeng wiki In fact, Fellout also adds better textures to
    much with the game world, adds in fresh desert sky textures and makes nights really,
    really dark.

    Surgery is surely an option but should basically be exercised
    as a possible option when all the recourses have been exhausted.
    Baofeng uv-5r irlp In the final, the positive thinking Internet radio provides is just not given from the DJs
    alone but by the music that they can play. We discussed
    how bullying continues as adults and I shared a story about how my wife had this happen to her by other parents right
    in front of these children.

    Your billing statements may possibly also have information on many counselling agencies that can allow you to
    improve your a bad credit score situation. ‘ Students are supposed to offer complete knowledge
    within their essay documents since this guides your
    audience and readers searching genuine attention and
    practically useful. Baofeng uv-5r gmrs baofeng bf-uv530i These writers normally help customers in selecting appropriate topics for his or her papers.
    Second, you’re pressured while using time allotment which includes given unto you with any
    particular one part of your respective examination.

  81. It is a tedious process, but it works well, if done by a
    skilled electrolysis. m beginning to sound like an informercial but the claims
    are that there really are things you can do that can help get that youthful jawline and
    line free forehead back. Two speeds and pressure control, plus a body contouring head that
    follows the contours of your body, makes the process easier
    and more efficient, so you can shave in one stroke and not have to go back over and over an area (that’s when it starts to get annoying with
    other epillators).

  82. I’ve been realizing that there is so a lot of people, not just in my personal community, but people in general, who think that the
    government is likely to take good care of them. Your choices in the caliber of car stereos might be limited, but
    in the event you choose a professional store, you won’t need to bother about fraudulent car equipment.
    Baofeng olx They are extremely commonly found these days when connecting portable satellite radios to car stereos.

    Here is a list of apps that are both free and offer a good selection. Baofeng hf They
    also broadcast live cricket commentary that you can have the hooting, claps coming from the
    across the world. I discovered Max Richter recently and if you
    love modern classical music, this is the better artist out there, in addition to
    Jóhann Jóhannsson that you can check out.

    three to eight words as the important thing words inside whole research paper.
    User stories are quick to write down and are certain to get all levels in the organization structure involved.

    downs baofeng gt-3 We have received hundreds of writing
    requests, sufficient reason for each request; we now have served each student.
    3) Be verbs (am, is, are, was, were, be, being, been) suck living
    out of one’s writing.

  83. Great news to knockoutjs lovers!

    P/s: too many spam comments

  84. Jesse Hattabaugh

    How do components inherit from one another?

  85. Remarkable! Its actually awesome paragraph, I have got much
    clear idea about from this paragraph.

  86. It’s an amazing article in support of all the internet users;
    they will obtain benefit from it I am sure.

  87. You owner’s manual should indicate the optimal pressure level for your tires.
    4) Relation to the other equipments: The refrigerating compressor
    is integral part of the cycle that includes other components of the cycle like condenser, expansion valve, and
    the evaporator. 1) Other gas and air compressors are independent entities:
    The compressors used for compressing the other gases and air are independent entities.
    Usually very expensive, some revolvers use this system.

    The various uses of compressed air onboard ship are listed below:
    . These reviews and article provide you enough knowledge
    about the product design and all its beneficial features.
    They are able to accomplish this through water absorption. The elements incorporate centrifugal
    pump, a drinking water resource, foam concentrate tanks, an air compressor, at the same time as immediate injection foam proportioning procedure
    for the discharge facet on the pump.

  88. This is the right website for anybody who really wants to understand this topic.
    You understand so much its almost hard to argue with you (not
    that I personally will need to

  89. Thanks , I’ve just been searching for info approximately this topic
    for a long time and yours is the best I have discovered so far.
    However, what in regards to the bottom line? Are you certain about the source?

  90. f_martinez

    Hi, Steven. I have noted strange difference between ko.applyBindingsToNode and ko.applyBindingAccessorsToNode which is intended to supersede the first function.

    Looks like old ko.applyBindingsToNode creates true two-way bindings and allows to apply writeable computeds with the “value” binding, but ko.applyBindingAccessorsToNode creates one-way binding and treat all bound computeds as read-only. I’ve just posted my answer on SO ( ) and was surprised by editor’s statement about planned substitution.

    You make sure that changing ko.applyBindingsToNode to ko.applyBindingAccessorsToNode will stop the example to work at this fiddle ( ). Any explanation will be very very appreciated.


  91. You really make it seem so easy with your presentation however I to find this topic natural ways to make my penus bigger
    be actually something which I feel I might by no means understand.
    It kind of feels too complex and extremely broad for me.
    I’m looking forward on your next put up, I will attempt to get the hold of it!