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    <pre class="lang-html prettyprint-override"><code>&lt;body&gt; &lt;p&gt;First name: &lt;input data-bind="value: firstName, valueUpdate: 'afterkeydown'" /&gt;&lt;/p&gt; &lt;p&gt;Last name: &lt;input data-bind="value: lastName, valueUpdate: 'afterkeydown'" /&gt;&lt;/p&gt; &lt;h2&gt;Hello, &lt;span data-bind="text: fullName"&gt; &lt;/span&gt;!&lt;/h2&gt; &lt;/body&gt; </code></pre> <p>From the <a href="http://knockoutjs.com/documentation/value-binding.html" rel="noreferrer">documentation</a></p> <blockquote> <h2>Additional parameters</h2> <ul> <li><p>valueUpdate</p> <p>If your binding also includes a parameter called valueUpdate, this defines which browser event KO should use to detect changes. The following string values are the most commonly useful choices:</p> <ul> <li><p>"change" (default) - updates your view model when the user moves the focus to a different control, or in the case of elements, immediately after any change</p></li> <li><p>"keyup" - updates your view model when the user releases a key</p></li> <li><p>"keypress" - updates your view model when the user has typed a key. Unlike keyup, this updates repeatedly while the user holds a key down</p></li> <li>"afterkeydown" - updates your view model as soon as the user begins typing a character. This works by catching the browser’s keydown event and handling the event asynchronously. </li> </ul></li> </ul> <p>Of these options, "afterkeydown" is the best choice if you want to keep your view model updated in real-time.</p> </blockquote>
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    1. POHow can I get Knockout JS to data-bind on keypress instead of lost-focus?
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    1. USSergei Golos
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    1. COawesome, what are the other events, valueUpdate observes?
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      1. USVin
    2. COfrom the docs in knockout.js: // The syntax "after<eventname>" means "run the handler asynchronously after the event" // This is useful, for example, to catch "keydown" events after the browser has updated the control
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      1. USJohn Wright
    3. COIs there anyway to get valueUpdate:'afterkeydown' to be the _default_?
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      1. USAaron Shafovaloff
 

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