Manually adding & removing validation errors to jQuery validator

I have solved this by overriding showErrors function in jQuery validator with my own, which is compatible with unobtrusive-generated validation spans, and cleaning up valid fields which have invalid class. It is not very nice workaround but it works.

Here is jsfiddle with solution: http://jsfiddle.net/goranobradovic/ughCm/5/

UPDATE: As link to external site is not proper answer according to site guidelines, I’m adding code sample here. For anyone already familiar with jQuery validation, just look at two lines of code in showErrors function. I assigned it to validator with validator.settings.showErrors = showErrors;.

HTML:

<form id="experiment" action="https://stackoverflow.com/" method="post">

<fieldset>
  <legend></legend>
        <div class="editor-label">
          <label for="Email">Email</label>
        </div>
        <div class="editor-field">
<input data-val="true" data-val-email="&amp;#39;Email&amp;#39; not valid email address." data-val-required="&amp;#39;Email&amp;#39; is mandatory." id="Email" name="Email" type="text" value=""><span class="field-validation-valid" data-valmsg-for="Email" data-valmsg-replace="true"></span>        
        </div>
        <div class="editor-label">
          <label for="FirstName">First name</label>
        </div>
        <div class="editor-field">
          <input class="text-box single-line" id="FirstName" name="FirstName" type="text" value="">
          <span class="field-validation-valid" data-valmsg-for="FirstName" data-valmsg-replace="true"></span>
        </div>

        <div class="editor-label">
          <label for="LastName">Last name</label>
        </div>
        <div class="editor-field">
          <input class="text-box single-line" id="LastName" name="LastName" type="text" value="">
          <span class="field-validation-valid" data-valmsg-for="LastName" data-valmsg-replace="true"></span>
        </div>   
</fieldset>
    <p>
        <button type="submit" class="save ui-button ui-widget ui-state-default ui-corner-all ui-button-text-icon-secondary" value="Save" role="button" aria-disabled="false"><span class="ui-button-text">Save</span><span class="ui-button-icon-secondary ui-icon ui-icon-disk"></span></button>

    </p>
</form>
<br/>

<button id="add">Add error</button>
<button id="remove">Remove error</button>

<br/>
<br/>
Debug:
<div id="debug"></div>

JavaScript:

var validator = {};

function addError(e) {
    validator.showErrors({
        "FirstName": "test error"
    });
}

function removeError(e) {
    validator.showErrors({
        "FirstName": null
    });
    fixValidFieldStyles($("form"), validator);
}

$(document).ready(function() {
    var $form = $("#experiment");
    // prevent form submission
    $form.submit(function(e) {
        e.preventDefault();
        return false;
    });
    $("#add").click(addError);
    $("#remove").click(removeError);
    $("#debug").html("<h1>Validator properties:</h1>");
    validator = $form.validate();
    validator.settings.showErrors = showErrors;
    for (var i in validator) {
        var row = $("<span></span>").html(i).append("<br/>");
        $("#debug").append(row);
    }
});


function showErrors(errorMessage, errormap, errorlist) {
    var val = this;
    errormap.forEach(function(error, index) {
        val.settings.highlight.call(val, error.element, val.settings.errorClass, val.settings.validClass);
        $(error.element).siblings("span.field-validation-valid, span.field-validation-error").html($("<span></span>").html(error.message)).addClass("field-validation-error").removeClass("field-validation-valid").show();
    });
}

function fixValidFieldStyles($form, validator) {
    var errors = {};
    $form.find("input,select").each(function(index) {
        var name = $(this).attr("name");
        errors[name] = validator.errorsFor(name);
    });
    validator.showErrors(errors);
    var invalidFields = $form.find("." + validator.settings.errorClass);
    if (invalidFields.length) {
        invalidFields.each(function(index, field) {
            if ($(field).valid()) {
                $(field).removeClass(validator.settings.errorClass);
            }
        });
    }
}