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    <p>Not sure why people would want to use ko.validation - it just replicates the processing breeze's client side is doing anyway. And given the breeze developers hints that validation will get even more power soon, why bother.</p> <p>So I started with Thiago Oliveira's great work. But I wanted to have the bare minimum of markup. By assuming the use of bootstrap classes &amp; defaulting the validation property name from the previous element I could simplify most markup additions to:</p> <pre><code>&lt;span class="help-inline" data-bind="breezeValidation: null"&gt;&lt;/span&gt; </code></pre> <p>Win! </p> <p>My ko.bindingHandler:</p> <pre><code>//Highlight field in red &amp; show first validation message // //Outputs first validation message for 'propertyName' or if null: previous controls value binding //Needs ancestor with 'control-group' class to set class 'error' for Bootstrap error display // //Example: //&lt;td class="control-group"&gt; // &lt;input class="input-block-level text-right" data-bind="value: id" /&gt; // &lt;span class="help-inline" data-bind="breezeValidation: null"&gt;&lt;/span&gt; //&lt;/td&gt; // //Does not and cannot validate keys that already exist in cache. knockout write calls breeze which throws uncaught error ko.bindingHandlers.breezeValidation = { init: function (element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) { // This will be called when the binding is first applied to an element // Set up any initial state, event handlers, etc. here var $msgElement = $(element); var entity = viewModel; var propName = valueAccessor(); if (propName === null) { // $element.prev().data("bind") = "value: itemType" var prevBinds = $msgElement.prev().data("bind"); if (!prevBinds) { $msgElement.text("Could not find prev elements binding value."); return; } var bindPhrases = prevBinds.split(/,/); for (var i = 0, j = bindPhrases.length; i &lt; j; i++) { var bindPhrase = bindPhrases[i]; if (utility.stringStartsWith(bindPhrase, 'value: ')) { propName = bindPhrase.substr(7); break; } } } if (!propName) { $msgElement.text("Could not find this or prev elements binding value."); return; } //var $groupElement = $msgElement.parent(); var $groupElement = $msgElement.closest(".control-group"); if (!$groupElement.hasClass("control-group")) { $msgElement.text("Could not find parent with 'control-group' class."); return; } onValidationChange(); //fire immediately (especially for added) //... and anytime validationErrors are changed fire onValidationChnange entity.entityAspect.validationErrorsChanged.subscribe(onValidationChange); element.onchange = function () { //Should never have updates pushed from validation msgElement $msgElement.text("readonly error"); }; function onValidationChange() { var errors = entity.entityAspect.getValidationErrors(propName); var message = ""; if (errors.length &gt; 0) { message = errors[0].errorMessage; } if (message) { $groupElement.addClass('error'); } else { $groupElement.removeClass('error'); } $msgElement.text(message); } } //Not interested in changes to valueAccessor - it is only the fieldName. //update: function (element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) { }; </code></pre> <p>Example view simple implicit property usage:</p> <pre><code>&lt;div class="control-group"&gt; &lt;label class="control-label" for="editStatusNote"&gt;Status note:&lt;/label&gt; &lt;div class="controls"&gt; &lt;input id="editStatusNote" type="text" data-bind="value: statusNote" /&gt; &lt;span class="help-inline" data-bind="breezeValidation: null"&gt;&lt;/span&gt; &lt;/div&gt; &lt;/div&gt; </code></pre> <p>Example view explicit property usage:</p> <pre><code>&lt;div class="control-group"&gt; &lt;label class="control-label" for="editAmount"&gt;Amount:&lt;/label&gt; &lt;div class="controls"&gt; &lt;div class="input-prepend"&gt; &lt;span class="add-on"&gt;$&lt;/span&gt; &lt;input id="editAmount" class="input-small" type="text" data-bind="value: amount" /&gt; &lt;/div&gt; &lt;span class="help-inline" data-bind="breezeValidation: 'amount'"&gt;&lt;/span&gt; &lt;/div&gt; &lt;/div&gt; </code></pre>
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