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    <p>If you want it to do updates on <code>afterkeydown</code> "by default," you could inject the <code>valueUpdate</code> binding in the <code>value</code> binding handler. Just supply a new <code>allBindingsAccessor</code> for the handler to use that includes <code>afterkeydown</code>.</p> <pre><code>(function () { var valueHandler = ko.bindingHandlers.value; var getInjectValueUpdate = function (allBindingsAccessor) { var AFTERKEYDOWN = 'afterkeydown'; return function () { var allBindings = ko.utils.extend({}, allBindingsAccessor()), valueUpdate = allBindings.valueUpdate; if (valueUpdate === undefined) { return ko.utils.extend(allBindings, { valueUpdate: AFTERKEYDOWN }); } else if (typeof valueUpdate === 'string' &amp;&amp; valueUpdate !== AFTERKEYDOWN) { return ko.utils.extend(allBindings, { valueUpdate: [valueUpdate, AFTERKEYDOWN] }); } else if (typeof valueUpdate === 'array' &amp;&amp; ko.utils.arrayIndexOf(valueUpdate, AFTERKEYDOWN) === -1) { valueUpdate = ko.utils.arrayPushAll([AFTERKEYDOWN], valueUpdate); return ko.utils.extend(allBindings, {valueUpdate: valueUpdate}); } return allBindings; }; }; ko.bindingHandlers.value = { // only needed for init 'init': function (element, valueAccessor, allBindingsAccessor) { allBindingsAccessor = getInjectValueUpdate(allBindingsAccessor); return valueHandler.init(element, valueAccessor, allBindingsAccessor); }, 'update': valueHandler.update }; } ()); </code></pre> <p>If you're not comfortable "overriding" the <code>value</code> binding, you could give the overriding custom binding a different name and use that binding handler.</p> <pre><code>ko.bindingHandlers.realtimeValue = { 'init':..., 'update':... }; </code></pre> <p><a href="http://jsfiddle.net/LhZB2/1/">demo</a></p> <p>A solution like this would be suitable for Knockout version 2.x. The Knockout team has fleshed out a more complete binding for text-like inputs through the <a href="http://knockoutjs.com/documentation/textinput-binding.html">textInput</a> binding in Knockout version 3 and up. It was designed to handle all text input methods for text inputs and <code>textarea</code>. It will even handle real time updating which effectively renders this approach obsolete.</p>
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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. USJeff Mercado
    1. USJeff Mercado
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    1. COWorks very well, thank you very much! I'll award you the bounty in 6 hours. ;)
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    2. COThis way makes my markup a little tidier. Also, in addition to 'afterkeydown', 'input' and 'paste' events can be added to handle paste/drag-and-drop actions.
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    3. COIn the above solution I think that "typeof valueUpdated === 'array'" needs to be replaced with "Object.prototype.toString.call(valueUpdate) === '[object Array]'". See http://stackoverflow.com/questions/4775722/javascript-check-if-object-is-array
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