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Asked: 2026-06-17T18:35:53+00:00

I copied one of examples of knockoutjs: <!DOCTYPE html> <html> <head> <script src=http://code.jquery.com/jquery-1.8.0.min.js></script> <script

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I copied one of examples of knockoutjs:

    <!DOCTYPE html>
    <html>
    <head>
      <script src="http://code.jquery.com/jquery-1.8.0.min.js"></script>
    <script src="http://cdnjs.cloudflare.com/ajax/libs/knockout/2.2.0/knockout-min.js"></script>

    <meta charset=utf-8 />
    <title>JS Bin</title>

    </head>
    <body>


    <h2>Participants</h2>
    Here are the participants:
    <div data-bind="template: { name: 'person-template', data: buyer }"></div>
    <div data-bind="template: { name: 'person-template', data: seller }"></div>





    <script id="person-template" type="text/html">
        <h3 data-bind="text: name"></h3>
        <p>Credits: <span data-bind="text: credits"></span></p>
    </script>

    <script type="text/javascript">
         function MyViewModel() {
             this.buyer = { name: 'Franklin', credits: 250 };
             this.seller = { name: 'Mario', credits: 5800 };
         }
         ko.applyBindings(new MyViewModel());
    </script>
    </html>

When I updated jQuery to Version 1.9, I’m got following error:

Uncaught TypeError: Object function (e,t){return new st.fn.init(e,t,X)} has no method 'clean'

I’d appreciate it if someone could explain if the bug is in jQuery or KO.

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1 Answer

  1. Editorial Team

    The Cause

    You are not using the most current version of Knockout. The previous version, 2.2.0, is incompatible with jQuery 1.9.x and on. See this Knockout dev thread:

    Knockout 2.2.0 uses jQuery.clean() which is deprecated and does not exist in 1.9.

    This means that Knockout 2.2.0 is calling an undefined jQuery method, thus triggering the JS error you specified.

    Solutions

    1. Consider updating to the latest version of Knockout which is compatible with jQuery 1.9
    2. If you can’t, use the jQuery Migrate
      plugin       which adds
      backward-compatibility to jQuery 1.9
    3. If all else fails, you’ll need to revert back to jQuery 1.8
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